24 Sep, 2009
1 commit
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* remove asm/atomic.h inclusion from linux/utsname.h --
not needed after kref conversion
* remove linux/utsname.h inclusion from files which do not need itNOTE: it looks like fs/binfmt_elf.c do not need utsname.h, however
due to some personality stuff it _is_ needed -- cowardly leave ELF-related
headers and files alone.Signed-off-by: Alexey Dobriyan
Signed-off-by: Linus Torvalds
23 Sep, 2009
2 commits
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Use function parameters instead of accessing the pt_regs structure
to get the parameters.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Use function parameters instead of accessing the pt_regs structure
to get the parameters.
Also merge the 31 and 64 bit versions since they are identical.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
19 Jun, 2009
1 commit
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avr32, mn10300, parisc, s390, sh, xtensa:
They never set PT_DTRACE, but clear it after do_execve().
Signed-off-by: Oleg Nesterov
Cc: David Howells
Acked-by: Kyle McMartin
Cc: Grant Grundler
Cc: Matthew Wilcox
Acked-by: Martin Schwidefsky
Cc: Heiko Carstens
Acked-by: Paul Mundt
Acked-by: Chris Zankel
Acked-by: Roland McGrath
Acked-by: Haavard Skinnemoen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
12 Jun, 2009
1 commit
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Implement is_compat_task and use it all over the place.
Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
03 Apr, 2009
1 commit
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First argument unused since 2.3.11.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Alexey Dobriyan
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
26 Mar, 2009
4 commits
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Move all EXPORT_SYMBOLs to their corresponding definitions.
Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Split machine check handler code and move it to cio and kernel code
where it belongs to. No functional change.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Initialize per thread timer values instead of just copying them from
the parent. That way it is easily possible to tell how much time a
thread spent in user/system context.
Doesn't fix a bug, this is just for debugging purposes.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Fix all the whitespace damage in process.c, especially copy_thread().
Next patch will add code to copy_thread() which needs to 'fixed' first.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
14 Jan, 2009
1 commit
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Signed-off-by: Heiko Carstens
31 Dec, 2008
2 commits
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Distinguish the cputime of the idle process where idle is actually using
cpu cycles from the cputime where idle is sleeping on an enabled wait psw.
The former is accounted as system time, the later as idle time.Signed-off-by: Martin Schwidefsky
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Increase the precision of the idle time calculation that is exported
to user space via /sys/devices/system/cpu/cpu/idle_time_usSigned-off-by: Martin Schwidefsky
15 Nov, 2008
1 commit
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Disable tracing on idle psw. Otherwise it would give us huge
preempt off times for idle. Which is rather pointless.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
22 Aug, 2008
1 commit
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Ever since commit 43ca5c3a1cefdaa09231d64485b8f676118bf1e0 ([S390] Convert
monitor calls to function calls.), the kernel refused to IPL with spinlock
debugging enabled.BUG: spinlock bad magic on CPU#0, swapper/0
lock: 00000000003a4668, .magic: 00000000, .owner: /-1, .owner_cpu: 0
CPU: 0 Not tainted 2.6.25 #1
Process swapper (pid: 0, task: 000000000034f958, ksp: 0000000000377d60)
0000000000377ab8 0000000000352628 0000000000377d60 0000000000377d60
0000000000016af4 00000000fffff7b5 0000000000377d60 0000000000000000
0000000000000000 0000000000377a18 0000000000000009 0000000000377a18
0000000000377a78 000000000023c920 0000000000016af4 0000000000377a18
0000000000000005 0000000000000000 0000000000377b58 0000000000377ab8
Call Trace:
([] show_trace+0xdc/0x108)
[] show_stack+0xc2/0xfc
[] dump_stack+0xb2/0xc0
[]Signed-off-by: Josef 'Jeff' Sipek
Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
19 Jul, 2008
1 commit
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Signed-off-by: Thomas Gleixner
14 Jul, 2008
1 commit
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The idle notifier chain consists of at most one element. So there's
no point in having a notifier chain. Remove it and directly call the
function.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
30 Apr, 2008
1 commit
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This is where it should be and we can get rid of some externs
and a static inline function.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
17 Apr, 2008
4 commits
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Newer s390 models have a breaking-event-address-recording register.
Each time an instruction causes a break in the sequential instruction
execution, the address is saved in that hardware register. On a program
interrupt the address is copied to the lowcore address 272-279, which
makes it software accessible.This patch changes the program check handler and the stack overflow
checker to copy the value into the pt_regs argument.
The oops output is enhanced to show the last known breaking address.
It might give additional information if the stack trace is corrupted.The feature is only available on 64 bit.
The new oops output looks like:
[---------snip----------]
Modules linked in: vmcp sunrpc qeth_l2 dm_mod qeth ccwgroup
CPU: 2 Not tainted 2.6.24zlive-host #8
Process modprobe (pid: 4788, task: 00000000bf3d8718, ksp: 00000000b2b0b8e0)
Krnl PSW : 0704200180000000 000003e000020028 (vmcp_init+0x28/0xe4 [vmcp])
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:2 PM:0 EA:3
Krnl GPRS: 0000000004000002 000003e000020000 0000000000000000 0000000000000001
000000000015734c ffffffffffffffff 000003e0000b3b00 0000000000000000
000003e00007ca30 00000000b5bb5d40 00000000b5bb5800 000003e0000b3b00
000003e0000a2000 00000000003ecf50 00000000b2b0bd50 00000000b2b0bcb0
Krnl Code: 000003e000020018: c0c000040ff4 larl %r12,3e0000a2000
000003e00002001e: e3e0f0000024 stg %r14,0(%r15)
000003e000020024: a7f40001 brc 15,3e000020026
>000003e000020028: e310c0100004 lg %r1,16(%r12)
000003e00002002e: c020000413dc larl %r2,3e0000a27e6
000003e000020034: c0a00004aee6 larl %r10,3e0000b5e00
000003e00002003a: a7490001 lghi %r4,1
000003e00002003e: a75900f0 lghi %r5,240
Call Trace:
([] blocking_notifier_call_chain+0x2c/0x40)
[] sys_init_module+0x19d8/0x1b08
[] sysc_noemu+0x10/0x16
[] 0x2000011cda2
Last Breaking-Event-Address:
[] vmcp_init+0x24/0xe4 [vmcp]
[---------snip----------]Signed-off-by: Christian Borntraeger
Signed-off-by: Martin Schwidefsky
Signed-off-by: Heiko Carstens -
Most noteable part of this commit is the new local header file entry.h
which contains all the function declarations of functions that get only
called from asm code or are arch internal. That way we can avoid extern
declarations in C files.
This is more or less the same that was done for sparc64.Signed-off-by: Martin Schwidefsky
Signed-off-by: Heiko Carstens -
This way we get rid of s390's NO_IDLE_HZ and use the generic dynticks
variant instead. In addition we get high resolution timers for free.Signed-off-by: Martin Schwidefsky
Signed-off-by: Heiko Carstens -
Remove the program check generating monitor calls and use function
calls instead. Theres is no real advantage in using monitor calls,
but they do make debugging harder, because of all the program checks
it generates.Signed-off-by: Martin Schwidefsky
Signed-off-by: Heiko Carstens
05 Mar, 2008
1 commit
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If a machine check handling is pending when the idle loop is entered
default_idle will be left with timer ticks and virtual timer disabled.
Fix this by "calling" the idle_chain. Also a BUG_ON(!in_interrupt) in
start_hz_timer must be removed since the function now gets called from
non interrupt context as well.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
19 Feb, 2008
1 commit
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If both NO_IDLE_HZ and VIRT_TIMER are disabled default_idle won't load
an enabled wait psw and busy loop instead. This is because the
idle_chain is empty and the return value of atomic_notifier_call_chain
will be NOTIFY_DONE, which causes default_idle to return instead of
loading an enabled wait psw.
Fix this by calling __atomic_notifier_call_chain instead and add proper
return value handling.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
10 Feb, 2008
1 commit
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Signed-off-by: Martin Schwidefsky
26 Jan, 2008
1 commit
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Also print PREEMPT and/or SMP if the kernel was configured that way.
Makes s390 look a bit more like other architectures.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
05 Nov, 2007
1 commit
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Commit fae8b22d3e3e3a3d317a7746493997af02a3f35c
"[S390] Add per-cpu idle time / idle count sysfs attributes" causes
a link error on !CONFIG_SMP.
Fix this by adding some #ifdef's. Real fix would be to cleanup the
code since we don't register a cpu on !CONFIG_SMP. But that would
be quite a big patch. For the time being this is good enough.arch/s390/kernel/built-in.o: In function `do_monitor_call':
(.text+0x50d4): undefined reference to `per_cpu__s390_idle'
arch/s390/kernel/built-in.o: In function `cpu_idle':
(.text+0x518c): undefined reference to `per_cpu__s390_idle'
make: *** [.tmp_vmlinux1] Error 1Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
22 Oct, 2007
2 commits
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Signed-off-by: Martin Schwidefsky
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Add two new sysfs entries per cpu: idle_count and idle_time.
idle_count contains the number of times a cpu went into idle state.
idle_time contains the time a cpu spent in idle state in microseconds.
This can be used e.g. by powertop to tell how often idle state is
entered and left.# cat /sys/devices/system/cpu/cpu0/idle_count
504
# cat /sys/devices/system/cpu/cpu0/idle_time
469734037 usCc: Arjan van de Ven
Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
20 Oct, 2007
1 commit
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One of the easiest things to isolate is the pid printed in kernel log.
There was a patch, that made this for arch-independent code, this one makes
so for arch/xxx files.It took some time to cross-compile it, but hopefully these are all the
printks in arch code.Signed-off-by: Alexey Dobriyan
Signed-off-by: Pavel Emelyanov
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
30 Jul, 2007
1 commit
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Remove fs.h from mm.h. For this,
1) Uninline vma_wants_writenotify(). It's pretty huge anyway.
2) Add back fs.h or less bloated headers (err.h) to files that need it.As result, on x86_64 allyesconfig, fs.h dependencies cut down from 3929 files
rebuilt down to 3444 (-12.3%).Cross-compile tested without regressions on my two usual configs and (sigh):
alpha arm-mx1ads mips-bigsur powerpc-ebony
alpha-allnoconfig arm-neponset mips-capcella powerpc-g5
alpha-defconfig arm-netwinder mips-cobalt powerpc-holly
alpha-up arm-netx mips-db1000 powerpc-iseries
arm arm-ns9xxx mips-db1100 powerpc-linkstation
arm-assabet arm-omap_h2_1610 mips-db1200 powerpc-lite5200
arm-at91rm9200dk arm-onearm mips-db1500 powerpc-maple
arm-at91rm9200ek arm-picotux200 mips-db1550 powerpc-mpc7448_hpc2
arm-at91sam9260ek arm-pleb mips-ddb5477 powerpc-mpc8272_ads
arm-at91sam9261ek arm-pnx4008 mips-decstation powerpc-mpc8313_rdb
arm-at91sam9263ek arm-pxa255-idp mips-e55 powerpc-mpc832x_mds
arm-at91sam9rlek arm-realview mips-emma2rh powerpc-mpc832x_rdb
arm-ateb9200 arm-realview-smp mips-excite powerpc-mpc834x_itx
arm-badge4 arm-rpc mips-fulong powerpc-mpc834x_itxgp
arm-carmeva arm-s3c2410 mips-ip22 powerpc-mpc834x_mds
arm-cerfcube arm-shannon mips-ip27 powerpc-mpc836x_mds
arm-clps7500 arm-shark mips-ip32 powerpc-mpc8540_ads
arm-collie arm-simpad mips-jazz powerpc-mpc8544_ds
arm-corgi arm-spitz mips-jmr3927 powerpc-mpc8560_ads
arm-csb337 arm-trizeps4 mips-malta powerpc-mpc8568mds
arm-csb637 arm-versatile mips-mipssim powerpc-mpc85xx_cds
arm-ebsa110 i386 mips-mpc30x powerpc-mpc8641_hpcn
arm-edb7211 i386-allnoconfig mips-msp71xx powerpc-mpc866_ads
arm-em_x270 i386-defconfig mips-ocelot powerpc-mpc885_ads
arm-ep93xx i386-up mips-pb1100 powerpc-pasemi
arm-footbridge ia64 mips-pb1500 powerpc-pmac32
arm-fortunet ia64-allnoconfig mips-pb1550 powerpc-ppc64
arm-h3600 ia64-bigsur mips-pnx8550-jbs powerpc-prpmc2800
arm-h7201 ia64-defconfig mips-pnx8550-stb810 powerpc-ps3
arm-h7202 ia64-gensparse mips-qemu powerpc-pseries
arm-hackkit ia64-sim mips-rbhma4200 powerpc-up
arm-integrator ia64-sn2 mips-rbhma4500 s390
arm-iop13xx ia64-tiger mips-rm200 s390-allnoconfig
arm-iop32x ia64-up mips-sb1250-swarm s390-defconfig
arm-iop33x ia64-zx1 mips-sead s390-up
arm-ixp2000 m68k mips-tb0219 sparc
arm-ixp23xx m68k-amiga mips-tb0226 sparc-allnoconfig
arm-ixp4xx m68k-apollo mips-tb0287 sparc-defconfig
arm-jornada720 m68k-atari mips-workpad sparc-up
arm-kafa m68k-bvme6000 mips-wrppmc sparc64
arm-kb9202 m68k-hp300 mips-yosemite sparc64-allnoconfig
arm-ks8695 m68k-mac parisc sparc64-defconfig
arm-lart m68k-mvme147 parisc-allnoconfig sparc64-up
arm-lpd270 m68k-mvme16x parisc-defconfig um-x86_64
arm-lpd7a400 m68k-q40 parisc-up x86_64
arm-lpd7a404 m68k-sun3 powerpc x86_64-allnoconfig
arm-lubbock m68k-sun3x powerpc-cell x86_64-defconfig
arm-lusl7200 mips powerpc-celleb x86_64-up
arm-mainstone mips-atlas powerpc-chrp32Signed-off-by: Alexey Dobriyan
Signed-off-by: Linus Torvalds
10 Jul, 2007
1 commit
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sched-cfs-v2.6.22-git-v18.patch introduces CPU_IDLE in sched.h.
This conflict with the already existing define in
include/asm-s390/processor.h
Just rename the s390 defines, since they will go away as soon as
we support CONFIG_NO_HZ instead of our own CONFIG_NO_IDLE_HZ.Signed-off-by: Heiko Carstens
Signed-off-by: Andrew Morton
Signed-off-by: Ingo Molnar
Signed-off-by: Martin Schwidefsky
09 May, 2007
1 commit
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Remove includes of where it is not used/needed.
Suggested by Al Viro.Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc,
sparc64, and arm (all 59 defconfigs).Signed-off-by: Randy Dunlap
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Apr, 2007
1 commit
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Remove system call glue for sys_clone, sys_fork, sys_vfork, sys_execve,
sys_sigreturn, sys_rt_sigreturn and sys_sigaltstack. Call do_execve from
kernel_execve directly, move pt_regs to the right place and branch to
sysc_return to start the user space program. This removes the last
in-kernel system call.Signed-off-by: Martin Schwidefsky
Signed-off-by: Heiko Carstens
06 Feb, 2007
1 commit
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This provides a noexec protection on s390 hardware. Our hardware does
not have any bits left in the pte for a hw noexec bit, so this is a
different approach using shadow page tables and a special addressing
mode that allows separate address spaces for code and data.As a special feature of our "secondary-space" addressing mode, separate
page tables can be specified for the translation of data addresses
(storage operands) and instruction addresses. The shadow page table is
used for the instruction addresses and the standard page table for the
data addresses.
The shadow page table is linked to the standard page table by a pointer
in page->lru.next of the struct page corresponding to the page that
contains the standard page table (since page->private is not really
private with the pte_lock and the page table pages are not in the LRU
list).
Depending on the software bits of a pte, it is either inserted into
both page tables or just into the standard (data) page table. Pages of
a vma that does not have the VM_EXEC bit set get mapped only in the
data address space. Any try to execute code on such a page will cause a
page translation exception. The standard reaction to this is a SIGSEGV
with two exceptions: the two system call opcodes 0x0a77 (sys_sigreturn)
and 0x0aad (sys_rt_sigreturn) are allowed. They are stored by the
kernel to the signal stack frame. Unfortunately, the signal return
mechanism cannot be modified to use an SA_RESTORER because the
exception unwinding code depends on the system call opcode stored
behind the signal stack frame.This feature requires that user space is executed in secondary-space
mode and the kernel in home-space mode, which means that the addressing
modes need to be switched and that the noexec protection only works
for user space.
After switching the addressing modes, we cannot use the mvcp/mvcs
instructions anymore to copy between kernel and user space. A new
mvcos instruction has been added to the z9 EC/BC hardware which allows
to copy between arbitrary address spaces, but on older hardware the
page tables need to be walked manually.Signed-off-by: Gerald Schaefer
Signed-off-by: Martin Schwidefsky
28 Sep, 2006
1 commit
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Major cleanup of all s390 inline assemblies. They now have a common
coding style. Quite a few have been shortened, mainly by using register
asm variables. Use of the EX_TABLE macro helps as well. The atomic ops,
bit ops and locking inlines new use the Q-constraint if a newer gcc
is used. That results in slightly better code.Thanks to Christian Borntraeger for proof reading the changes.
Signed-off-by: Martin Schwidefsky
12 Jul, 2006
1 commit
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Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
04 Jul, 2006
1 commit
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irqtrace support for s390.
Signed-off-by: Heiko Carstens
Signed-off-by: Ingo Molnar
Cc: Martin Schwidefsky
Cc: Arjan van de Ven
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
01 Jul, 2006
1 commit
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Signed-off-by: Jörn Engel
Signed-off-by: Adrian Bunk
28 Mar, 2006
1 commit
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The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chainBLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chainIt's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern
Signed-off-by: Chandra Seetharaman
Signed-off-by: Jes Sorensen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
