02 Nov, 2017
1 commit
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Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.By default all files without license information are under the default
license of the kernel, which is GPL version 2.Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if
Reviewed-by: Philippe Ombredanne
Reviewed-by: Thomas Gleixner
Signed-off-by: Greg Kroah-Hartman
26 Sep, 2017
1 commit
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Rename this function to better express that it's all about
initializing the FPU state of a task which goes hand in hand
with the fpu::initialized field.Cc: Andrew Morton
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Dave Hansen
Cc: Eric Biggers
Cc: Fenghua Yu
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Rik van Riel
Cc: Thomas Gleixner
Cc: Yu-cheng Yu
Link: http://lkml.kernel.org/r/20170923130016.21448-33-mingo@kernel.org
Signed-off-by: Ingo Molnar
05 Sep, 2017
1 commit
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Pull x86 apic updates from Thomas Gleixner:
"This update provides:- Cleanup of the IDT management including the removal of the extra
tracing IDT. A first step to cleanup the vector management code.- The removal of the paravirt op adjust_exception_frame. This is a
XEN specific issue, but merged through this branch to avoid nasty
merge collisions- Prevent dmesg spam about the TSC DEADLINE bug, when the CPU has
disabled the TSC DEADLINE timer in CPUID.- Adjust a debug message in the ioapic code to print out the
information correctly"* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (51 commits)
x86/idt: Fix the X86_TRAP_BP gate
x86/xen: Get rid of paravirt op adjust_exception_frame
x86/eisa: Add missing include
x86/idt: Remove superfluous ALIGNment
x86/apic: Silence "FW_BUG TSC_DEADLINE disabled due to Errata" on CPUs without the feature
x86/idt: Remove the tracing IDT leftovers
x86/idt: Hide set_intr_gate()
x86/idt: Simplify alloc_intr_gate()
x86/idt: Deinline setup functions
x86/idt: Remove unused functions/inlines
x86/idt: Move interrupt gate initialization to IDT code
x86/idt: Move APIC gate initialization to tables
x86/idt: Move regular trap init to tables
x86/idt: Move IST stack based traps to table init
x86/idt: Move debug stack init to table based
x86/idt: Switch early trap init to IDT tables
x86/idt: Prepare for table based init
x86/idt: Move early IDT setup out of 32-bit asm
x86/idt: Move early IDT handler setup to IDT code
x86/idt: Consolidate IDT invalidation
...
29 Aug, 2017
3 commits
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Functions in math-emu are annotated as ENTRY() symbols, but their
ends are not annotated at all. But these are standard functions
called from C, with proper stack register update etc.Omitting the ends means:
* the annotations are not paired and we cannot deal with such functions
e.g. in objtool* the symbols are not marked as functions in the object file
* there are no sizes of the functions in the object file
So fix this by adding ENDPROC() to each such case in math-emu.
Signed-off-by: Jiri Slaby
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Brian Gerst
Cc: Denys Vlasenko
Cc: H. Peter Anvin
Cc: Josh Poimboeuf
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Link: http://lkml.kernel.org/r/20170824080624.7768-1-jslaby@suse.cz
Signed-off-by: Ingo Molnar -
The GDT entry related code uses two ways to access entries via
union fields:- bitfields
- macros which initialize the two 16-bit parts of the entry
by magic shift and mask operations.Clean it up and only use the bitfields to initialize and access entries.
( The old access patterns were partly done due to GCC optimizing bitfield
accesses in a horrible way - that's mostly fixed these days and clarity
of code in such low level accessors is very important. )Signed-off-by: Thomas Gleixner
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Brian Gerst
Cc: Denys Vlasenko
Cc: H. Peter Anvin
Cc: Josh Poimboeuf
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Steven Rostedt
Link: http://lkml.kernel.org/r/20170828064958.197673367@linutronix.de
Signed-off-by: Ingo Molnar -
desc_struct is a union of u32 fields and bitfields. The access to the u32
fields is done with magic macros.Convert it to use the bitfields and replace the macro magic with parseable
inline functions.Signed-off-by: Thomas Gleixner
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Brian Gerst
Cc: Denys Vlasenko
Cc: H. Peter Anvin
Cc: Josh Poimboeuf
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Steven Rostedt
Link: http://lkml.kernel.org/r/20170828064958.042406718@linutronix.de
Signed-off-by: Ingo Molnar
20 Jul, 2017
2 commits
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gcc-7.1.1 produces this warning:
arch/x86/math-emu/reg_add_sub.c: In function 'FPU_add':
arch/x86/math-emu/reg_add_sub.c:80:48: error: ?: using integer constants in boolean context [-Werror=int-in-bool-context]This appears to be a bug in gcc-7.1.1, and I have reported it as
PR81484. The compiler suggests that code written asif (a & b ? c : d)
is usually incorrect and should have been
if (a & (b ? c : d))
However, in this case, we correctly write
if ((a & b) ? c : d)
and should not get a warning for it.
This adds a dirty workaround for the problem, adding a comparison with
zero inside of the macro. The warning is currently disabled in the kernel,
so we may decide not to apply the patch, and instead wait for future gcc
releases to fix the problem. On the other hand, it seems to be the
only instance of this particular problem.Signed-off-by: Arnd Bergmann
Cc: Bill Metzenthen
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Link: http://lkml.kernel.org/r/20170719125310.2487451-4-arnd@arndb.de
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81484
Signed-off-by: Ingo Molnar -
When building the kernel with "make EXTRA_CFLAGS=...", this overrides
the "PARANOID" preprocessor macro defined in arch/x86/math-emu/Makefile,
and we run into a build warning:arch/x86/math-emu/reg_compare.c: In function ‘compare_i_st_st’:
arch/x86/math-emu/reg_compare.c:254:6: error: ‘f’ may be used uninitialized in this function [-Werror=maybe-uninitialized]This fixes the implementation to work correctly even without the PARANOID
flag, and also fixes the Makefile to not use the EXTRA_CFLAGS variable
but instead use the ccflags-y variable in the Makefile that is meant
for this purpose.Signed-off-by: Arnd Bergmann
Cc: Bill Metzenthen
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Link: http://lkml.kernel.org/r/20170719125310.2487451-3-arnd@arndb.de
Signed-off-by: Ingo Molnar
08 Jun, 2017
1 commit
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... because this is exactly what it is: the number of entries in the
LDT. Calling it "size" is simply confusing and it is actually begging
to be called "nr_entries" or somesuch, especially if you see constructs
like:alloc_size = size * LDT_ENTRY_SIZE;
since LDT_ENTRY_SIZE is the size of a single entry.
There should be no functionality change resulting from this patch, as
the before/after output from tools/testing/selftests/x86/ldt_gdt.c
shows.Signed-off-by: Borislav Petkov
Acked-by: Andy Lutomirski
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Link: http://lkml.kernel.org/r/20170606173116.13977-1-bp@alien8.de
[ Renamed 'n_entries' to 'nr_entries' ]
Signed-off-by: Ingo Molnar
25 Dec, 2016
1 commit
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This was entirely automated, using the script by Al:
PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*'
sed -i -e "s!$PATT!#include !" \
$(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h)to do the replacement at the end of the merge window.
Requested-by: Al Viro
Signed-off-by: Linus Torvalds
04 Nov, 2015
1 commit
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Pull x86 sigcontext header cleanups from Ingo Molnar:
"This series reorganizes and cleans up various aspects of the main
sigcontext UAPI headers, such as unifying the data structures and
updating/adding lots of comments to explain all the ABI details and
quirks. The headers can now also be built in user-space standalone"* 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/headers: Clean up too long lines
x86/headers: Remove references on the kernel side
x86/headers: Remove direct sigcontext32.h uses
x86/headers: Convert sigcontext_ia32 uses to sigcontext_32
x86/headers: Unify 'struct sigcontext_ia32' and 'struct sigcontext_32'
x86/headers: Make sigcontext pointers bit independent
x86/headers: Move the 'struct sigcontext' definitions into the UAPI header
x86/headers: Clean up the kernel's struct sigcontext types to be ABI-clean
x86/headers: Convert uses of _fpstate_ia32 to _fpstate_32
x86/headers: Unify 'struct _fpstate_ia32' and i386 struct _fpstate
x86/headers: Unify register type definitions between 32-bit compat and i386
x86/headers: Use ABI types consistently in sigcontext*.h
x86/headers: Separate out legacy user-space structure definitions
x86/headers: Clean up and better document uapi/asm/sigcontext.h
x86/headers: Clean up uapi/asm/sigcontext32.h
x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h
20 Sep, 2015
4 commits
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These FPU instructions were added in SSE3-enabled CPUs.
Run-tested by booting with "no387 nofxsr" and running test
program:[RUN] Testing fisttp instructions
[OK] fisttpSigned-off-by: Denys Vlasenko
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Brian Gerst
Cc: H. Peter Anvin
Cc: Kees Cook
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Shuah Khan
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1442600614-28428-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar -
Run-tested by booting with "no387 nofxsr" and running test
program:[RUN] Testing fcmovCC instructions
[OK] fcmovCCSigned-off-by: Denys Vlasenko
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Brian Gerst
Cc: H. Peter Anvin
Cc: Kees Cook
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1442588010-20055-3-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar -
Run-tested by booting with "no387 nofxsr" and running test
program:[RUN] Testing f[u]comi[p] instructions
[OK] f[u]comi[p]
Signed-off-by: Denys Vlasenko
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Brian Gerst
Cc: H. Peter Anvin
Cc: Kees Cook
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1442588010-20055-2-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar -
No code changes.
Signed-off-by: Denys Vlasenko
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Brian Gerst
Cc: H. Peter Anvin
Cc: Kees Cook
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1442588010-20055-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar
15 Sep, 2015
1 commit
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We always want to support all FPU opcodes, including
undocumented ones. That define was fully justified ~20 years ago
but not today. Let's not complicate the code with it.Signed-off-by: Denys Vlasenko
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: H. Peter Anvin
Cc: Kees Cook
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Link: http://lkml.kernel.org/r/1440699330-1305-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar
08 Sep, 2015
1 commit
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Now that all type definitions are in the UAPI header, include it
directly, instead of through .[ We still keep asm/sigcontext.h, so that uapi/asm/sigcontext32.h
can include . ]Acked-by: Mikko Rapeli
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Brian Gerst
Cc: Denys Vlasenko
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1441438363-9999-16-git-send-email-mingo@kernel.org
Signed-off-by: Ingo Molnar
18 Aug, 2015
1 commit
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Conflicts:
arch/x86/entry/entry_64_compat.S
arch/x86/math-emu/get_address.cSigned-off-by: Ingo Molnar
17 Aug, 2015
1 commit
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The previous fix confused a selector with a segment prefix. Fix it.
Compile-tested only.
Cc: stable@vger.kernel.org
Cc: Juergen Gross
Reported-by: Linus Torvalds
Fixes: 4809146b86c3 ("x86/ldt: Correct FPU emulation access to LDT")
Signed-off-by: Andy Lutomirski
Signed-off-by: Linus Torvalds
08 Aug, 2015
1 commit
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Commit 37868fe113ff ("x86/ldt: Make modify_ldt synchronous")
introduced a new struct ldt_struct anchored at mm->context.ldt.Adapt the x86 fpu emulation code to use that new structure.
Signed-off-by: Juergen Gross
Reviewed-by: Andy Lutomirski
Cc: # On top of: 37868fe113ff: x86/ldt: Make modify_ldt synchronous
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: billm@melbpc.org.au
Link: http://lkml.kernel.org/r/1438883674-1240-1-git-send-email-jgross@suse.com
Signed-off-by: Ingo Molnar
31 Jul, 2015
1 commit
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vm86.h was being implicitly included in alot of places via
processor.h, which in turn got it from math_emu.h. Break that
chain and explicitly include vm86.h in all files that need it.
Also remove unused vm86 field from math_emu_info.Signed-off-by: Brian Gerst
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Denys Vlasenko
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Link: http://lkml.kernel.org/r/1438148483-11932-7-git-send-email-brgerst@gmail.com
[ Fixed build failure. ]
Signed-off-by: Ingo Molnar
19 May, 2015
12 commits
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Use these consistent names:
struct fregs_state # was: i387_fsave_struct
struct fxregs_state # was: i387_fxsave_struct
struct swregs_state # was: i387_soft_struct
struct xregs_state # was: xsave_struct
union fpregs_state # was: thread_xstateCc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
Harmonize the inconsistent naming of these related functions:
fpstate_init()
finit_soft_fpu() => fpstate_init_fsoft()
fx_finit() => fpstate_init_fxstate()
fx_finit() => fpstate_init_fstate() # split outCc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
Now that fpstate_init_curr() is not doing implicit allocations
anymore, almost all uses of it involve a very simple pattern:if (!fpu->fpstate_active)
fpstate_init_curr(fpu);which is basically activating the FPU fpstate if it was not active
before.So propagate the check into the function itself, and rename the
function according to its new purpose:fpu__activate_curr(fpu);
Reviewed-by: Borislav Petkov
Cc: Andy Lutomirski
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
Now that there are no FPU context allocations, rename fpstate_alloc_init()
to fpstate_init_curr(), to signal that it initializes the fpstate and
marks it active, for the current task.Reviewed-by: Borislav Petkov
Cc: Andy Lutomirski
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
Remove the failure code and propagate this down to callers.
Note that this function still has an 'init' aspect, which must be
called.Reviewed-by: Borislav Petkov
Cc: Andy Lutomirski
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
So 6 years ago we made the FPU fpstate dynamically allocated:
aa283f49276e ("x86, fpu: lazy allocation of FPU area - v5")
61c4628b5386 ("x86, fpu: split FPU state from task struct - v5")In hindsight this was a mistake:
- it complicated context allocation failure handling, such as:
/* kthread execs. TODO: cleanup this horror. */
if (WARN_ON(fpstate_alloc_init(fpu)))
force_sig(SIGKILL, tsk);- it caused us to enable irqs in fpu__restore():
local_irq_enable();
/*
* does a slab alloc which can sleep
*/
if (fpstate_alloc_init(fpu)) {
/*
* ran out of memory!
*/
do_group_exit(SIGKILL);
return;
}
local_irq_disable();- it (slightly) slowed down task creation/destruction by adding
slab allocation/free pattens.- it made access to context contents (slightly) slower by adding
one more pointer dereference.The motivation for the dynamic allocation was two-fold:
- reduce memory consumption by non-FPU tasks
- allocate and handle only the necessary amount of context for
various XSAVE processors that have varying hardware frame
sizes.These days, with glibc using SSE memcpy by default and GCC optimizing
for SSE/AVX by default, the scope of FPU using apps on an x86 system is
much larger than it was 6 years ago.For example on a freshly installed Fedora 21 desktop system, with a
recent kernel, all non-kthread tasks have used the FPU shortly after
bootup.Also, even modern embedded x86 CPUs try to support the latest vector
instruction set - so they'll too often use the larger xstate frame
sizes.So remove the dynamic allocation complication by embedding the FPU
fpstate in task_struct again. This should make the FPU a lot more
accessible to all sorts of atomic contexts.We could still optimize for the xstate frame size in the future,
by moving the state structure to the last element of task_struct,
and allocating only a part of that.This change is kept minimal by still keeping the ctx_alloc()/free()
routines (that now do nothing substantial) - we'll remove them in
the following patches.Reviewed-by: Borislav Petkov
Cc: Andy Lutomirski
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
There are a number of FPU internal function prototypes and an inline function
in fpu/api.h, mostly placed so historically as the code grew over the years.Move them over into fpu/internal.h where they belong. (Add sched.h include
to stackprotector.h which incorrectly relied on getting it from fpu/api.h.)fpu/api.h is now a pure file that only contains FPU APIs intended for driver
use.Reviewed-by: Borislav Petkov
Cc: Andy Lutomirski
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
We already have fpu/types.h, move i387.h to fpu/api.h.
The file name has become a misnomer anyway: it offers generic FPU APIs,
but is not limited to i387 functionality.Reviewed-by: Borislav Petkov
Cc: Andy Lutomirski
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
Migrate this function to pure 'struct fpu' usage.
Reviewed-by: Borislav Petkov
Cc: Andy Lutomirski
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
Introduce a simple fpu->fpstate_active flag in the fpu context data structure
and use that instead of PF_USED_MATH in task->flags.Testing for this flag byte should be slightly more efficient than
testing a bit in a bitmask, but the main advantage is that most
FPU functions can now be performed on a 'struct fpu' alone, they
don't need access to 'struct task_struct' anymore.There's a slight linecount increase, mostly due to the 'fpu' local
variables and due to extra comments. The local variables will go away
once we move most of the FPU methods to pure 'struct fpu' parameters.Reviewed-by: Borislav Petkov
Cc: Andy Lutomirski
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
PF_USED_MATH is used directly, but also in a handful of helper inlines.
To ease the elimination of PF_USED_MATH, convert all inline helpers
to open-coded PF_USED_MATH usage.Reviewed-by: Borislav Petkov
Cc: Andy Lutomirski
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar -
Most init_fpu() users don't want the register-saving aspect of the
function, they are calling it for 'current' and when FPU registers
are not allocated and initialized yet.Split out a simplified API that does just that (and add debug-checks
for these conditions): fpstate_alloc_init().Use it where appropriate.
Reviewed-by: Borislav Petkov
Cc: Andy Lutomirski
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: H. Peter Anvin
Cc: Linus Torvalds
Cc: Oleg Nesterov
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Signed-off-by: Ingo Molnar
06 May, 2014
1 commit
-
As requested by Linus add explicit __visible to the asmlinkage users.
This marks all functions visible to assembler.Tree sweep for arch/x86/*
Signed-off-by: Andi Kleen
Link: http://lkml.kernel.org/r/1398984278-29319-3-git-send-email-andi@firstfloor.org
Signed-off-by: H. Peter Anvin
28 Jan, 2014
1 commit
-
The kernel already has this information, so other bits of kernel code
shouldn't duplicate that. This also eliminates the use of __DATE__,
which makes the build non-deterministic.This message was already disabled at build time, with PRINT_MESSAGES
undef'd at the top of the file.Signed-off-by: Josh Triplett
Signed-off-by: Michal Marek
13 Mar, 2012
1 commit
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There are precedences of trap number being referred to as
trap_nr. However thread struct refers trap number as trap_no.
Change it to trap_nr.Also use enum instead of left-over literals for trap values.
This is pure cleanup, no functional change intended.
Suggested-by: Ingo Molnar
Signed-off-by: Srikar Dronamraju
Cc: Linus Torvalds
Cc: Ananth N Mavinakayanahalli
Cc: Jim Keniston
Cc: Linux-mm
Cc: Oleg Nesterov
Cc: Andi Kleen
Cc: Christoph Hellwig
Cc: Steven Rostedt
Cc: Arnaldo Carvalho de Melo
Cc: Masami Hiramatsu
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/20120312092555.5379.942.sendpatchset@srdronam.in.ibm.com
[ Fixed the math-emu build ]
Signed-off-by: Ingo Molnar
11 May, 2010
2 commits
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Unbreak FPU emulation, broken by checkin
86603283326c9e95e5ad4e9fdddeec93cac5d9ad:
x86: Introduce 'struct fpu' and related APISigned-off-by: H. Peter Anvin
Cc: Avi Kivity
Cc: Suresh Siddha
LKML-Reference: -
Currently all fpu state access is through tsk->thread.xstate. Since we wish
to generalize fpu access to non-task contexts, wrap the state in a new
'struct fpu' and convert existing access to use an fpu API.Signal frame handlers are not converted to the API since they will remain
task context only things.Signed-off-by: Avi Kivity
Acked-by: Suresh Siddha
LKML-Reference:
Signed-off-by: H. Peter Anvin
28 Mar, 2009
1 commit
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Conflicts:
arch/parisc/kernel/irq.c
arch/x86/include/asm/fixmap_64.h
arch/x86/include/asm/setup.h
kernel/irq/handle.cSemantic merge:
arch/x86/include/asm/fixmap.hSigned-off-by: Ingo Molnar
05 Mar, 2009
1 commit
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Impact: fix math-emu related crash while using GDB/ptrace
init_fpu() calls finit to initialize a task's xstate, while finit always
works on the current task. If we use PTRACE_GETFPREGS on another
process and both processes did not already use floating point, we get
a null pointer exception in finit.This patch creates a new function finit_task that takes a task_struct
parameter. finit becomes a wrapper that simply calls finit_task with
current. On the plus side this avoids many calls to get_current which
would each resolve to an inline assembler mov instruction.An empty finit_task has been added to i387.h to avoid linker errors in
case the compiler still emits the call in init_fpu when
CONFIG_MATH_EMULATION is not defined.The declaration of finit in i387.h has been removed as the remaining
code using this function gets its prototype from fpu_proto.h.Signed-off-by: Daniel Glöckner
Cc: Suresh Siddha
Cc: "Pallipadi Venkatesh"
Cc: Arjan van de Ven
Cc: Bill Metzenthen
LKML-Reference:
Signed-off-by: Ingo Molnar
