11 Jul, 2021
1 commit
-
Pull Kbuild updates from Masahiro Yamada:
- Increase the -falign-functions alignment for the debug option.
- Remove ugly libelf checks from the top Makefile.
- Make the silent build (-s) more silent.
- Re-compile the kernel if KBUILD_BUILD_TIMESTAMP is specified.
- Various script cleanups
* tag 'kbuild-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (27 commits)
scripts: add generic syscallnr.sh
scripts: check duplicated syscall number in syscall table
sparc: syscalls: use pattern rules to generate syscall headers
parisc: syscalls: use pattern rules to generate syscall headers
nds32: add arch/nds32/boot/.gitignore
kbuild: mkcompile_h: consider timestamp if KBUILD_BUILD_TIMESTAMP is set
kbuild: modpost: Explicitly warn about unprototyped symbols
kbuild: remove trailing slashes from $(KBUILD_EXTMOD)
kconfig.h: explain IS_MODULE(), IS_ENABLED()
kconfig: constify long_opts
scripts/setlocalversion: simplify the short version part
scripts/setlocalversion: factor out 12-chars hash construction
scripts/setlocalversion: add more comments to -dirty flag detection
scripts/setlocalversion: remove workaround for old make-kpkg
scripts/setlocalversion: remove mercurial, svn and git-svn supports
kbuild: clean up ${quiet} checks in shell scripts
kbuild: sink stdout from cmd for silent build
init: use $(call cmd,) for generating include/generated/compile.h
kbuild: merge scripts/mkmakefile to top Makefile
sh: move core-y in arch/sh/Makefile to arch/sh/Kbuild
...
09 Jul, 2021
6 commits
-
Like syscallhdr.sh and syscalltbl.sh, add a simple script to generate
the __NR_syscalls, which should not be exported to userspace.This script is useful to replace arch/mips/kernel/syscalls/syscallnr.sh,
refactor arch/s390/kernel/syscalls/syscalltbl, and eliminate the code
surrounded by #ifdef __KERNEL__ / #endif from exported uapi/asm/unistd_*.h
files.Signed-off-by: Masahiro Yamada
-
Currently, syscall{hdr,tbl}.sh sorts the entire syscall table, but you
can assume it is already sorted by the syscall number.The generated syscall table does not work if the same syscall number
appears twice. Check it in the script.Signed-off-by: Masahiro Yamada
-
Add "auto" to the usage message so that it's a little clearer that you can
pass "auto" as the second argument. When passing "auto" the script tries
to find the base path automatically instead of requiring it be passed on
the commandline. Also use [] to indicate the variable argument
and that it is optional so that we can differentiate from the literal
"auto" that should be passed.Link: https://lkml.kernel.org/r/20210511003845.2429846-11-swboyd@chromium.org
Signed-off-by: Stephen Boyd
Cc: Jiri Olsa
Cc: Alexei Starovoitov
Cc: Jessica Yu
Cc: Evan Green
Cc: Hsin-Yi Wang
Cc: Konstantin Khlebnikov
Cc: Sasha Levin
Cc: Andy Shevchenko
Cc: Baoquan He
Cc: Borislav Petkov
Cc: Catalin Marinas
Cc: Dave Young
Cc: Ingo Molnar
Cc: Matthew Wilcox
Cc: Petr Mladek
Cc: Rasmus Villemoes
Cc: Sergey Senozhatsky
Cc: Steven Rostedt
Cc: Thomas Gleixner
Cc: Vivek Goyal
Cc: Will Deacon
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Sometimes if you're using tools that have linked things improperly or have
new features/sections that older tools don't expect you'll see warnings
printed to stderr. We don't really care about these warnings, so let's
just silence these messages to cleanup output of this script.Link: https://lkml.kernel.org/r/20210511003845.2429846-10-swboyd@chromium.org
Signed-off-by: Stephen Boyd
Cc: Jiri Olsa
Cc: Alexei Starovoitov
Cc: Jessica Yu
Cc: Evan Green
Cc: Hsin-Yi Wang
Cc: Konstantin Khlebnikov
Cc: Sasha Levin
Cc: Andy Shevchenko
Cc: Baoquan He
Cc: Borislav Petkov
Cc: Catalin Marinas
Cc: Dave Young
Cc: Ingo Molnar
Cc: Matthew Wilcox
Cc: Petr Mladek
Cc: Rasmus Villemoes
Cc: Sergey Senozhatsky
Cc: Steven Rostedt
Cc: Thomas Gleixner
Cc: Vivek Goyal
Cc: Will Deacon
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Now that stacktraces contain the build ID information we can update this
script to use debuginfod-find to locate the debuginfo for the vmlinux and
modules automatically. This can replace the existing code that requires
specifying a path to vmlinux or tries to find the vmlinux and modules
automatically by using the release number. Work it into the script as a
fallback option if the vmlinux isn't specified on the commandline.Link: https://lkml.kernel.org/r/20210511003845.2429846-9-swboyd@chromium.org
Signed-off-by: Stephen Boyd
Cc: Jiri Olsa
Cc: Alexei Starovoitov
Cc: Jessica Yu
Cc: Evan Green
Cc: Hsin-Yi Wang
Cc: Konstantin Khlebnikov
Cc: Sasha Levin
Cc: Petr Mladek
Cc: Steven Rostedt
Cc: Andy Shevchenko
Cc: Matthew Wilcox
Cc: Baoquan He
Cc: Borislav Petkov
Cc: Catalin Marinas
Cc: Dave Young
Cc: Ingo Molnar
Cc: Rasmus Villemoes
Cc: Sergey Senozhatsky
Cc: Thomas Gleixner
Cc: Vivek Goyal
Cc: Will Deacon
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Wire up memfd_secret system call on architectures that define
ARCH_HAS_SET_DIRECT_MAP, namely arm64, risc-v and x86.Link: https://lkml.kernel.org/r/20210518072034.31572-7-rppt@kernel.org
Signed-off-by: Mike Rapoport
Acked-by: Palmer Dabbelt
Acked-by: Arnd Bergmann
Acked-by: Catalin Marinas
Acked-by: David Hildenbrand
Acked-by: James Bottomley
Cc: Alexander Viro
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Christopher Lameter
Cc: Dan Williams
Cc: Dave Hansen
Cc: David Hildenbrand
Cc: Elena Reshetova
Cc: Hagen Paul Pfeifer
Cc: "H. Peter Anvin"
Cc: Ingo Molnar
Cc: James Bottomley
Cc: "Kirill A. Shutemov"
Cc: Mark Rutland
Cc: Matthew Wilcox
Cc: Michael Kerrisk
Cc: Palmer Dabbelt
Cc: Paul Walmsley
Cc: Peter Zijlstra
Cc: Rick Edgecombe
Cc: Roman Gushchin
Cc: Shakeel Butt
Cc: Shuah Khan
Cc: Thomas Gleixner
Cc: Tycho Andersen
Cc: Will Deacon
Cc: kernel test robot
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
07 Jul, 2021
1 commit
-
Pull coccinelle updates from Julia Lawall:
"There are two new semantic patches:- minmax: To use min and max instead of ? :
- swap: To use swap when possible
Some other semantic patches have been updated to better conform to
Linux kernel developer expectations or to make the explanation message
more clear.Finally, there is a fix for the coccicheck script"
* 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/jlawall/linux:
coccinelle: api: remove kobj_to_dev.cocci script
scripts: coccicheck: fix troubles on non-English builds
coccinelle: misc: minmax: suppress patch generation for err returns
drop unneeded *s
coccinelle: irqf_oneshot: reduce the severity due to false positives
coccinelle: misc: add swap script
coccinelle: misc: update uninitialized_var.cocci documentation
coccinelle: misc: restrict patch mode in flexible_array.cocci
coccinelle: misc: add minmax script
05 Jul, 2021
1 commit
-
Pull s390 updates from Vasily Gorbik:
- Rework inline asm to get rid of error prone "register asm"
constructs, which are problematic especially when code
instrumentation is enabled.In particular introduce and use register pair union to allocate
even/odd register pairs. Unfortunately this breaks compatibility with
older clang compilers and minimum clang version for s390 has been
raised to 13.https://lore.kernel.org/linux-next/CAK7LNARuSmPCEy-ak0erPrPTgZdGVypBROFhtw+=3spoGoYsyw@mail.gmail.com/
- Fix gcc 11 warnings, which triggered various minor reworks all over
the code.- Add zstd kernel image compression support.
- Rework boot CPU lowcore handling.
- De-duplicate and move kernel memory layout setup logic earlier.
- Few fixes in preparation for FORTIFY_SOURCE performing compile-time
and run-time field bounds checking for mem functions.- Remove broken and unused power management support leftovers in s390
drivers.- Disable stack-protector for decompressor and purgatory to fix
buildroot build.- Fix vt220 sclp console name to match the char device name.
- Enable HAVE_IOREMAP_PROT and add zpci_set_irq()/zpci_clear_irq() in
zPCI code.- Remove some implausible WARN_ON_ONCEs and remove arch specific
counter transaction call backs in favour of default transaction
handling in perf code.- Extend/add new uevents for online/config/mode state changes of AP
card / queue device in zcrypt.- Minor entry and ccwgroup code improvements.
- Other small various fixes and improvements all over the code.
* tag 's390-5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (91 commits)
s390/dasd: use register pair instead of register asm
s390/qdio: get rid of register asm
s390/ioasm: use symbolic names for asm operands
s390/ioasm: get rid of register asm
s390/cmf: get rid of register asm
s390/lib,string: get rid of register asm
s390/lib,uaccess: get rid of register asm
s390/string: get rid of register asm
s390/cmpxchg: use register pair instead of register asm
s390/mm,pages-states: get rid of register asm
s390/lib,xor: get rid of register asm
s390/timex: get rid of register asm
s390/hypfs: use register pair instead of register asm
s390/zcrypt: Switch to flexible array member
s390/speculation: Use statically initialized const for instructions
virtio/s390: get rid of open-coded kvm hypercall
s390/pci: add zpci_set_irq()/zpci_clear_irq()
scripts/min-tool-version.sh: Raise minimum clang version to 13.0.0 for s390
s390/ipl: use register pair instead of register asm
s390/mem_detect: fix tprot() program check new psw handling
...
03 Jul, 2021
1 commit
-
Merge more updates from Andrew Morton:
"190 patches.Subsystems affected by this patch series: mm (hugetlb, userfaultfd,
vmscan, kconfig, proc, z3fold, zbud, ras, mempolicy, memblock,
migration, thp, nommu, kconfig, madvise, memory-hotplug, zswap,
zsmalloc, zram, cleanups, kfence, and hmm), procfs, sysctl, misc,
core-kernel, lib, lz4, checkpatch, init, kprobes, nilfs2, hfs,
signals, exec, kcov, selftests, compress/decompress, and ipc"* emailed patches from Andrew Morton : (190 commits)
ipc/util.c: use binary search for max_idx
ipc/sem.c: use READ_ONCE()/WRITE_ONCE() for use_global_lock
ipc: use kmalloc for msg_queue and shmid_kernel
ipc sem: use kvmalloc for sem_undo allocation
lib/decompressors: remove set but not used variabled 'level'
selftests/vm/pkeys: exercise x86 XSAVE init state
selftests/vm/pkeys: refill shadow register after implicit kernel write
selftests/vm/pkeys: handle negative sys_pkey_alloc() return code
selftests/vm/pkeys: fix alloc_random_pkey() to make it really, really random
kcov: add __no_sanitize_coverage to fix noinstr for all architectures
exec: remove checks in __register_bimfmt()
x86: signal: don't do sas_ss_reset() until we are certain that sigframe won't be abandoned
hfsplus: report create_date to kstat.btime
hfsplus: remove unnecessary oom message
nilfs2: remove redundant continue statement in a while-loop
kprobes: remove duplicated strong free_insn_page in x86 and s390
init: print out unknown kernel parameters
checkpatch: do not complain about positive return values starting with EPOLL
checkpatch: improve the indented label test
checkpatch: scripts/spdxcheck.py now requires python3
...
02 Jul, 2021
3 commits
-
checkpatch complains about positive return values of poll functions.
Example:WARNING: return of an errno should typically be negative (ie: return -EPOLLIN)
+ return EPOLLIN;Poll functions return positive values. The defines for the return values
of poll functions all start with EPOLL, resulting in a number of false
positives. An often used workaround is to assign poll function return
values to variables and returning that variable, but that is a less than
perfect solution.There is no error definition which starts with EPOLL, so it is safe to
omit the warning for return values starting with EPOLL.Link: https://lkml.kernel.org/r/20210622004334.638680-1-linux@roeck-us.net
Signed-off-by: Guenter Roeck
Acked-by: Joe Perches
Cc: Ricardo Ribalda
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
checkpatch identifies a label only when a terminating colon
immediately follows an identifier.Bitfield definitions can appear to be labels so ignore any
spaces between the identifier terminating colon and any digit
that may be used to define a bitfield length.Miscellanea:
o Improve the initial checkpatch comment
o Use the more typical '&&' instead of 'and'
o Require the initial label character to be a non-digit
(Can't use $Ident here because $Ident allows ## concatenation)
o Use $sline instead of $line to ignore comments
o Use '$sline !~ /.../' instead of '!($line =~ /.../)'Link: https://lkml.kernel.org/r/b54d673e7cde7de5de0c9ba4dd57dd0858580ca4.camel@perches.com
Signed-off-by: Joe Perches
Cc: Greg Kroah-Hartman
Cc: Manikishan Ghantasala
Cc: Alex Elder
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Since commit d0259c42abff ("spdxcheck.py: Use Python 3"), spdxcheck.py
explicitly expects to run as python3 script. If "python" still points to
python v2.7 and the script is executed with "python scripts/spdxcheck.py",
the following error may be seen even if git-python is installed for
python3.Traceback (most recent call last):
File "scripts/spdxcheck.py", line 10, in
import git
ImportError: No module named gitTo fix the problem, check for the existence of python3, check if
the script is executable and not just for its existence, and execute
it directly.Link: https://lkml.kernel.org/r/20210505211720.447111-1-linux@roeck-us.net
Signed-off-by: Guenter Roeck
Cc: Joe Perches
Cc: Bert Vermeulen
Cc: Dwaipayan Ray
Cc: Lukas Bulwahn
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
30 Jun, 2021
5 commits
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Merge misc updates from Andrew Morton:
"191 patches.Subsystems affected by this patch series: kthread, ia64, scripts,
ntfs, squashfs, ocfs2, kernel/watchdog, and mm (gup, pagealloc, slab,
slub, kmemleak, dax, debug, pagecache, gup, swap, memcg, pagemap,
mprotect, bootmem, dma, tracing, vmalloc, kasan, initialization,
pagealloc, and memory-failure)"* emailed patches from Andrew Morton : (191 commits)
mm,hwpoison: make get_hwpoison_page() call get_any_page()
mm,hwpoison: send SIGBUS with error virutal address
mm/page_alloc: split pcp->high across all online CPUs for cpuless nodes
mm/page_alloc: allow high-order pages to be stored on the per-cpu lists
mm: replace CONFIG_FLAT_NODE_MEM_MAP with CONFIG_FLATMEM
mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA
docs: remove description of DISCONTIGMEM
arch, mm: remove stale mentions of DISCONIGMEM
mm: remove CONFIG_DISCONTIGMEM
m68k: remove support for DISCONTIGMEM
arc: remove support for DISCONTIGMEM
arc: update comment about HIGHMEM implementation
alpha: remove DISCONTIGMEM and NUMA
mm/page_alloc: move free_the_page
mm/page_alloc: fix counting of managed_pages
mm/page_alloc: improve memmap_pages dbg msg
mm: drop SECTION_SHIFT in code comments
mm/page_alloc: introduce vm.percpu_pagelist_high_fraction
mm/page_alloc: limit the number of pages on PCP lists when reclaim is active
mm/page_alloc: scale the number of pages that are batch freed
... -
Commit "mm/page_alloc: convert per-cpu list protection to local_lock" will
introduce a zero-sized per-CPU variable, which causes pahole to generate
invalid BTF. Only pahole versions 1.18 through 1.21 are impacted, as
before 1.18 pahole doesn't know anything about per-CPU variables, and 1.22
contains the proper fix for the issue.Luckily, pahole 1.18 got --skip_encoding_btf_vars option disabling BTF
generation for per-CPU variables in anticipation of some unanticipated
problems. So use this escape hatch to disable per-CPU var BTF info on
those problematic pahole versions. Users relying on availability of
per-CPU var BTFs would need to upgrade to pahole 1.22+, but everyone won't
notice any regressions.Link: https://lkml.kernel.org/r/20210530002536.3193829-1-andrii@kernel.org
Signed-off-by: Andrii Nakryiko
Acked-by: Mel Gorman
Cc: Arnaldo Carvalho de Melo
Cc: Hao Luo
Cc: Michal Suchanek
Cc: Jiri Olsa
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Here are some of the more common spelling mistakes and typos that I've
found while fixing up spelling mistakes in the kernel in the past few
months.Link: https://lkml.kernel.org/r/20210514093655.8829-1-colin.king@canonical.com
Signed-off-by: Colin Ian King
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The tab stop for Perl files is by default (at least in emacs) to be 4
spaces, where a tab is used for all 8 spaces. Add a local variable
comment to make vim do the same by default, and this will help keep the
file consistent in the future when others edit it via vim and not emacs.Link: https://lkml.kernel.org/r/20210322214032.293992979@goodmis.org
Signed-off-by: Steven Rostedt (VMware)
Cc: Masahiro Yamada
Cc: "John (Warthog9) Hawley"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Patch series "streamline_config.pl: Fix Perl spacing".
Talking with John Hawley about how vim and emacs deal with Perl files with
respect to tabs and spaces, I found that some of my Perl code in the
kernel had inconsistent spacing. The way emacs handles Perl by default is
to use 4 spaces per indent, but make all 8 spaces into a single tab. Vim
does not do this by default. But if you add the vim variable control:# vim: softtabstop=4
to a perl file, it makes vim behave the same way as emacs.
The first patch is to change all 8 spaces into a single tab (mostly from
people editing the file with vim). The next patch adds the softtabstop
variable to make vim act like emacs by default.This patch (of 2):
As Perl code tends to have 4 space indentation, but uses tabs for every 8
spaces, make that consistent in the streamline_config.pl code. Replace
all 8 spaces with a single tab.Link: https://lkml.kernel.org/r/20210322214032.133596267@goodmis.org
Signed-off-by: Steven Rostedt (VMware)
Cc: "John (Warthog9) Hawley"
Cc: Masahiro Yamada
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
29 Jun, 2021
4 commits
-
Pull documentation updates from Jonathan Corbet:
"This was a reasonably active cycle for documentation; this includes:- Some kernel-doc cleanups. That script is still regex onslaught from
hell, but it has gotten a little better.- Improvements to the checkpatch docs, which are also used by the
tool itself.- A major update to the pathname lookup documentation.
- Elimination of :doc: markup, since our automarkup magic can create
references from filenames without all the extra noise.- The flurry of Chinese translation activity continues.
Plus, of course, the usual collection of updates, typo fixes, and
warning fixes"* tag 'docs-5.14' of git://git.lwn.net/linux: (115 commits)
docs: path-lookup: use bare function() rather than literals
docs: path-lookup: update symlink description
docs: path-lookup: update get_link() ->follow_link description
docs: path-lookup: update WALK_GET, WALK_PUT desc
docs: path-lookup: no get_link()
docs: path-lookup: update i_op->put_link and cookie description
docs: path-lookup: i_op->follow_link replaced with i_op->get_link
docs: path-lookup: Add macro name to symlink limit description
docs: path-lookup: remove filename_mountpoint
docs: path-lookup: update do_last() part
docs: path-lookup: update path_mountpoint() part
docs: path-lookup: update path_to_nameidata() part
docs: path-lookup: update follow_managed() part
docs: Makefile: Use CONFIG_SHELL not SHELL
docs: Take a little noise out of the build process
docs: x86: avoid using ReST :doc:`foo` markup
docs: virt: kvm: s390-pv-boot.rst: avoid using ReST :doc:`foo` markup
docs: userspace-api: landlock.rst: avoid using ReST :doc:`foo` markup
docs: trace: ftrace.rst: avoid using ReST :doc:`foo` markup
docs: trace: coresight: coresight.rst: avoid using ReST :doc:`foo` markup
... -
Pull arm64 updates from Will Deacon:
"There's a reasonable amount here and the juicy details are all below.It's worth noting that the MTE/KASAN changes strayed outside of our
usual directories due to core mm changes and some associated changes
to some other architectures; Andrew asked for us to carry these [1]
rather that take them via the -mm tree.Summary:
- Optimise SVE switching for CPUs with 128-bit implementations.
- Fix output format from SVE selftest.
- Add support for versions v1.2 and 1.3 of the SMC calling
convention.- Allow Pointer Authentication to be configured independently for
kernel and userspace.- PMU driver cleanups for managing IRQ affinity and exposing event
attributes via sysfs.- KASAN optimisations for both hardware tagging (MTE) and out-of-line
software tagging implementations.- Relax frame record alignment requirements to facilitate 8-byte
alignment with KASAN and Clang.- Cleanup of page-table definitions and removal of unused memory
types.- Reduction of ARCH_DMA_MINALIGN back to 64 bytes.
- Refactoring of our instruction decoding routines and addition of
some missing encodings.- Move entry code moved into C and hardened against harmful compiler
instrumentation.- Update booting requirements for the FEAT_HCX feature, added to v8.7
of the architecture.- Fix resume from idle when pNMI is being used.
- Additional CPU sanity checks for MTE and preparatory changes for
systems where not all of the CPUs support 32-bit EL0.- Update our kernel string routines to the latest Cortex Strings
implementation.- Big cleanup of our cache maintenance routines, which were
confusingly named and inconsistent in their implementations.- Tweak linker flags so that GDB can understand vmlinux when using
RELR relocations.- Boot path cleanups to enable early initialisation of per-cpu
operations needed by KCSAN.- Non-critical fixes and miscellaneous cleanup"
* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (150 commits)
arm64: tlb: fix the TTL value of tlb_get_level
arm64: Restrict undef hook for cpufeature registers
arm64/mm: Rename ARM64_SWAPPER_USES_SECTION_MAPS
arm64: insn: avoid circular include dependency
arm64: smp: Bump debugging information print down to KERN_DEBUG
drivers/perf: fix the missed ida_simple_remove() in ddr_perf_probe()
perf/arm-cmn: Fix invalid pointer when access dtc object sharing the same IRQ number
arm64: suspend: Use cpuidle context helpers in cpu_suspend()
PSCI: Use cpuidle context helpers in psci_cpu_suspend_enter()
arm64: Convert cpu_do_idle() to using cpuidle context helpers
arm64: Add cpuidle context save/restore helpers
arm64: head: fix code comments in set_cpu_boot_mode_flag
arm64: mm: drop unused __pa(__idmap_text_start)
arm64: mm: fix the count comments in compute_indices
arm64/mm: Fix ttbr0 values stored in struct thread_info for software-pan
arm64: mm: Pass original fault address to handle_mm_fault()
arm64/mm: Drop SECTION_[SHIFT|SIZE|MASK]
arm64/mm: Use CONT_PMD_SHIFT for ARM64_MEMSTART_SHIFT
arm64/mm: Drop SWAPPER_INIT_MAP_SIZE
arm64: Conditionally configure PTR_AUTH key of the kernel.
... -
Pull locking updates from Ingo Molnar:
- Core locking & atomics:
- Convert all architectures to ARCH_ATOMIC: move every architecture
to ARCH_ATOMIC, then get rid of ARCH_ATOMIC and all the
transitory facilities and #ifdefs.Much reduction in complexity from that series:
63 files changed, 756 insertions(+), 4094 deletions(-)
- Self-test enhancements
- Futexes:
- Add the new FUTEX_LOCK_PI2 ABI, which is a variant that doesn't
set FLAGS_CLOCKRT (.e. uses CLOCK_MONOTONIC).[ The temptation to repurpose FUTEX_LOCK_PI's implicit setting of
FLAGS_CLOCKRT & invert the flag's meaning to avoid having to
introduce a new variant was resisted successfully. ]- Enhance futex self-tests
- Lockdep:
- Fix dependency path printouts
- Optimize trace saving
- Broaden & fix wait-context checks
- Misc cleanups and fixes.
* tag 'locking-core-2021-06-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits)
locking/lockdep: Correct the description error for check_redundant()
futex: Provide FUTEX_LOCK_PI2 to support clock selection
futex: Prepare futex_lock_pi() for runtime clock selection
lockdep/selftest: Remove wait-type RCU_CALLBACK tests
lockdep/selftests: Fix selftests vs PROVE_RAW_LOCK_NESTING
lockdep: Fix wait-type for empty stack
locking/selftests: Add a selftest for check_irq_usage()
lockding/lockdep: Avoid to find wrong lock dep path in check_irq_usage()
locking/lockdep: Remove the unnecessary trace saving
locking/lockdep: Fix the dep path printing for backwards BFS
selftests: futex: Add futex compare requeue test
selftests: futex: Add futex wait test
seqlock: Remove trailing semicolon in macros
locking/lockdep: Reduce LOCKDEP dependency list
locking/lockdep,doc: Improve readability of the block matrix
locking/atomics: atomic-instrumented: simplify ifdeffery
locking/atomic: delete !ARCH_ATOMIC remnants
locking/atomic: xtensa: move to ARCH_ATOMIC
locking/atomic: sparc: move to ARCH_ATOMIC
locking/atomic: sh: move to ARCH_ATOMIC
...
28 Jun, 2021
1 commit
-
clang versions prior to the current development version of 13.0.0 cannot
compile s390 after commit 3abbdfde5a65 ("s390/bitops: use register pair
instead of register asm") and the s390 maintainers do not intend to work
around this in the kernel. Codify this in scripts/min-tool-version.sh
similar to arm64 with GCC 5.1.0 so that there are no reports of broken
builds.[hca@linux.ibm.com: breaking compatibility with older clang compilers
is intended to finally make use of a feature which allows the
compiler to allocate even/odd register pairs. This is possible since
a very long time with gcc, but only since llvm-project commit
d058262b1471 ("[SystemZ] Support i128 inline asm operands.") with
clang. Using that feature allows to get rid of error prone register
asm statements, of which the above named kernel commit is only the
first of a larger not yet complete series.]Reported-by: Naresh Kamboju
Signed-off-by: Nathan Chancellor
Acked-by: Nick Desaulniers
Acked-by: Masahiro Yamada
Link: https://lore.kernel.org/r/20210617193139.856957-1-nathan@kernel.org
Signed-off-by: Heiko Carstens
Signed-off-by: Vasily Gorbik
24 Jun, 2021
1 commit
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Optimise out-of-line KASAN checking when using software tagging.
* for-next/kasan:
kasan: arm64: support specialized outlined tag mismatch checks
22 Jun, 2021
1 commit
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Using kobj_to_dev() instead of container_of() is not universally
accepted among maintainers as an improvement. The warning leads to
repeated patch submissions that won't be accepted. Remove the script.Cc: Christoph Hellwig
Cc: Jens Axboe
Cc: Denis Efremov
Cc: Julia Lawall
Signed-off-by: Keith Busch
Signed-off-by: Julia Lawall
Acked-by: Jens Axboe
Acked-by: Denis Efremov
18 Jun, 2021
1 commit
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One should only use st_shndx when >SHN_UNDEF and = SHN_LORESERVE && st_shndx != SHN_XINDEX.
Link: https://lore.kernel.org/lkml/20210607023839.26387-1-mark-pk.tsai@mediatek.com/
Link: https://lkml.kernel.org/r/20210616154126.2794-1-mark-pk.tsai@mediatek.comReported-by: Mark-PK Tsai
Tested-by: Mark-PK Tsai
Signed-off-by: Peter Zijlstra (Intel)
[handle endianness of sym->st_shndx]
Signed-off-by: Mark-PK Tsai
Signed-off-by: Steven Rostedt (VMware)
17 Jun, 2021
2 commits
-
To avoid unnecessary recompilations, mkcompile_h does not regenerate
compile.h if just the timestamp changed.
Though, if KBUILD_BUILD_TIMESTAMP is set, an explicit timestamp for the
build was requested, in which case we should not ignore it.If a user follows the documentation for reproducible builds [1] and
defines KBUILD_BUILD_TIMESTAMP as the git commit timestamp, a clean
build will have the correct timestamp. A subsequent cherry-pick (or
amend) changes the commit timestamp and if an incremental build is done
with a different KBUILD_BUILD_TIMESTAMP now, that new value is not taken
into consideration. But it should for reproducibility.Hence, whenever KBUILD_BUILD_TIMESTAMP is explicitly set, do not ignore
UTS_VERSION when making a decision about whether the regenerated version
of compile.h should be moved into place.[1] https://www.kernel.org/doc/html/latest/kbuild/reproducible-builds.html
Signed-off-by: Matthias Maennich
Signed-off-by: Masahiro Yamada -
One common cause of modpost version generation failures is a failure to
prototype exported assembly functions - the tooling requires this for
exported functions even if they are not and should not be called from C
code in order to do the version mangling for symbols. Unfortunately the
error message is currently rather abstruse, simply saying that "version
generation failed" and even diving into the code doesn't directly show
what's going on since there's several steps between the problem and it
being observed.Provide an explicit hint as to the likely cause of a version generation
failure to help anyone who runs into this in future more readily diagnose
and fix the problem.Signed-off-by: Mark Brown
Signed-off-by: Masahiro Yamada
08 Jun, 2021
1 commit
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GDB produces the following warning when debugging kernels built with
CONFIG_RELR:BFD: /android0/linux-next/vmlinux: unknown type [0x13] section `.relr.dyn'
when loading a kernel built with CONFIG_RELR into GDB. It can also
prevent debugging symbols using such relocations.Peter sugguests:
[That flag] means that lld will use dynamic tags and section type
numbers in the OS-specific range rather than the generic range. The
kernel itself doesn't care about these numbers; it determines the
location of the RELR section using symbols defined by a linker script.Link: https://github.com/ClangBuiltLinux/linux/issues/1057
Suggested-by: Peter Collingbourne
Reviewed-by: Nathan Chancellor
Signed-off-by: Nick Desaulniers
Link: https://lore.kernel.org/r/20210522012626.2811297-1-ndesaulniers@google.com
Signed-off-by: Will Deacon
05 Jun, 2021
2 commits
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getopt_long() does not modify the long_opts structure.
Signed-off-by: Masahiro Yamada
-
With multiple git working directories, '.git' may also be a text file
linking to the actual git tree instead of a directory.Cc: Mauro Carvalho Chehab
Cc: Jonathan Corbet
Cc: linux-doc@vger.kernel.org
Signed-off-by: Rob Herring
Reviewed-by: Mauro Carvalho Chehab
Tested-by: Mauro Carvalho Chehab
Link: https://lore.kernel.org/r/20210603012806.331132-1-robh@kernel.org
Signed-off-by: Jonathan Corbet
02 Jun, 2021
2 commits
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The pip packages are only needed when the distro-provided
Sphinx version is not good enough.Don't recommend installing it if not needed.
Signed-off-by: Mauro Carvalho Chehab
Link: https://lore.kernel.org/r/04ce53b77b37f1e495c3abc39c2d3dc407895dc0.1621949137.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet -
The sphinx-pre-install supports installing sphinx via a virtual
environment using pip/pypi or directly from the distribution's
package, when --no-virtualenv is used.However, even when --no-virtualenv, the current logic is
still recomending to install a virtual env, due to a regression.It turns that the logic there is complex, as it depends on
several different conditions.Split the code which recommends Sphinx on two separate
functions, in order to clean up the code.Signed-off-by: Mauro Carvalho Chehab
Link: https://lore.kernel.org/r/9dedaec201803017b7a7dc24a074f3a4f040b72a.1621949137.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet
28 May, 2021
1 commit
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The ccache tool can be used to speed up cross-compilation, by calling the
compiler and binutils through ccache. For example, following should work:$ export ARCH=arm64 CROSS_COMPILE="ccache aarch64-linux-gnu-"
$ make M=drivers/gpu/drm/rockchip/
but pahole fails to extract the BTF info from DWARF, breaking the build:
CC [M] drivers/gpu/drm/rockchip//rockchipdrm.mod.o
LD [M] drivers/gpu/drm/rockchip//rockchipdrm.ko
BTF [M] drivers/gpu/drm/rockchip//rockchipdrm.ko
aarch64-linux-gnu-objcopy: invalid option -- 'J'
Usage: aarch64-linux-gnu-objcopy [option(s)] in-file [out-file]
Copies a binary file, possibly transforming it in the process
...
make[1]: *** [scripts/Makefile.modpost:156: __modpost] Error 2
make: *** [Makefile:1866: modules] Error 2this fails because OBJCOPY is set to "ccache aarch64-linux-gnu-copy" and
later pahole is executed with the following command line:LLVM_OBJCOPY=$(OBJCOPY) $(PAHOLE) -J --btf_base vmlinux $@
which gets expanded to:
LLVM_OBJCOPY=ccache aarch64-linux-gnu-objcopy pahole -J ...
instead of:
LLVM_OBJCOPY="ccache aarch64-linux-gnu-objcopy" pahole -J ...
Fixes: 5f9ae91f7c0d ("kbuild: Build kernel module BTFs if BTF is enabled and pahole supports it")
Signed-off-by: Javier Martinez Canillas
Signed-off-by: Andrii Nakryiko
Acked-by: Andrii Nakryiko
Acked-by: Arnaldo Carvalho de Melo
Link: https://lore.kernel.org/bpf/20210526215228.3729875-1-javierm@redhat.com
27 May, 2021
6 commits
-
By using outlined checks we can achieve a significant code size
improvement by moving the tag-based ASAN checks into separate
functions. Unlike the existing CONFIG_KASAN_OUTLINE mode these
functions have a custom calling convention that preserves most
registers and is specialized to the register containing the address
and the type of access, and as a result we can eliminate the code
size and performance overhead of a standard calling convention such
as AAPCS for these functions.This change depends on a separate series of changes to Clang [1] to
support outlined checks in the kernel, although the change works fine
without them (we just don't get outlined checks). This is because the
flag -mllvm -hwasan-inline-all-checks=0 has no effect until the Clang
changes land. The flag was introduced in the Clang 9.0 timeframe as
part of the support for outlined checks in userspace and because our
minimum Clang version is 10.0 we can pass it unconditionally.Outlined checks require a new runtime function with a custom calling
convention. Add this function to arch/arm64/lib.I measured the code size of defconfig + tag-based KASAN, as well
as boot time (i.e. time to init launch) on a DragonBoard 845c with
an Android arm64 GKI kernel. The results are below:code size boot time
CONFIG_KASAN_INLINE=y before 92824064 6.18s
CONFIG_KASAN_INLINE=y after 38822400 6.65s
CONFIG_KASAN_OUTLINE=y 39215616 11.48sWe can see straight away that specialized outlined checks beat the
existing CONFIG_KASAN_OUTLINE=y on both code size and boot time
for tag-based ASAN.As for the comparison between CONFIG_KASAN_INLINE=y before and after
we saw similar performance numbers in userspace [2] and decided
that since the performance overhead is minimal compared to the
overhead of tag-based ASAN itself as well as compared to the code
size improvements we would just replace the inlined checks with the
specialized outlined checks without the option to select between them,
and that is what I have implemented in this patch.Signed-off-by: Peter Collingbourne
Acked-by: Andrey Konovalov
Reviewed-by: Mark Rutland
Tested-by: Mark Rutland
Link: https://linux-review.googlesource.com/id/I1a30036c70ab3c3ee78d75ed9b87ef7cdc3fdb76
Link: [1] https://reviews.llvm.org/D90426
Link: [2] https://reviews.llvm.org/D56954
Link: https://lore.kernel.org/r/20210526174927.2477847-3-pcc@google.com
Signed-off-by: Will Deacon -
Reduce the indentation.
Signed-off-by: Masahiro Yamada
Reviewed-by: Greg Kroah-Hartman
Reviewed-by: Nico Schottelius -
Both of if and else parts append exactly 12 hex chars, but in
different ways.Factor out the else part because we need to support it without relying
on git-describe. Remove the --abbrev=12 option since we do not use the
hash from git-describe anyway.Signed-off-by: Masahiro Yamada
Reviewed-by: Greg Kroah-Hartman
Reviewed-by: Nico Schottelius -
This script stumbled on the read-only source tree over again:
- a2bb90a08cb3 ("kbuild: fix delay in setlocalversion on readonly
source")- cdf2bc632ebc ("scripts/setlocalversion on write-protected source
tree")- 8ef14c2c41d9 ("Revert "scripts/setlocalversion: git: Make -dirty
check more robust"")- ff64dd485730 ("scripts/setlocalversion: Improve -dirty check with
git-status --no-optional-locks")Add comments to clarify that this script should never ever try to write
to the source tree.'git describe --dirty' might look as a simple solution for appending
the -dirty string, but we cannot use it because it creates the
.git/index.lock file.Signed-off-by: Masahiro Yamada
Reviewed-by: Greg Kroah-Hartman
Reviewed-by: Nico Schottelius -
This reverts commit b052ce4c840e ("kbuild: fix false positive -dirty
tag caused by make-kpkg").If I understand correctly, this problem occurred in very old versions
of make-kpkg. When I tried a newer version, make-kpkg did not touch
scripts/package/Makefile.Anyway, Debian uses 'make deb-pkg' instead of make-kpkg these days.
Debian handbook [1] mentions it as "the good old days":
"CULTURE The good old days of kernel-package
Before the Linux build system gained the ability to build proper
Debian packages, the recommended way to build such packages was to
use make-kpkg from the kernel-package package."[1]: https://debian-handbook.info/browse/stable/sect.kernel-compilation.html
Signed-off-by: Masahiro Yamada
Reviewed-by: Greg Kroah-Hartman
Reviewed-by: Nico Schottelius -
The mercurial, svn, git-svn supports were added by the following commits:
- 3dce174cfcba ("kbuild: support mercurial in setlocalversion")
- ba3d05fb6369 ("kbuild: add svn revision information to setlocalversion")
- ff80aa97c9b4 ("setlocalversion: add git-svn support")
They did not explain why they are useful for the kernel source tree.
Let's revert all of them, and see if somebody will complain about it.Signed-off-by: Masahiro Yamada
Reviewed-by: Greg Kroah-Hartman
Reviewed-by: Nico Schottelius
