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compiler/gcc4: Add quirk for 'asm goto' miscompilation bug

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commit 3f0116c323 upstream.

Fengguang Wu, Oleg Nesterov and Peter Zijlstra tracked down
a kernel crash to a GCC bug: GCC miscompiles certain 'asm goto'
constructs, as outlined here:

  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670

Implement a workaround suggested by Jakub Jelinek.

Reported-and-tested-by: Fengguang Wu <fengguang.wu@intel.com>
Reported-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Suggested-by: Jakub Jelinek <jakub@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
[hq: Backported to 3.4: Adjust context]
Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Jianguo Wu <wujianguo@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ingo Molnar 2013-10-10 10:16:30 +02:00 committed by Greg Kroah-Hartman
parent 460207adba
commit d19157519c
7 changed files with 22 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/mips/include/asm/jump_label.h
View file

@ -22,7 +22,7 @@
static __always_inline bool arch_static_branch(struct static_key *key)
{
asm goto("1:\tnop\n\t"
asm_volatile_goto("1:\tnop\n\t"
"nop\n\t"
".pushsection __jump_table, \"aw\"\n\t"
WORD_INSN " 1b, %l[l_yes], %0\n\t"

2
arch/powerpc/include/asm/jump_label.h
View file

@ -19,7 +19,7 @@
static __always_inline bool arch_static_branch(struct static_key *key)
{
asm goto("1:\n\t"
asm_volatile_goto("1:\n\t"
"nop\n\t"
".pushsection __jump_table, \"aw\"\n\t"
JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"

2
arch/s390/include/asm/jump_label.h
View file

@ -15,7 +15,7 @@
static __always_inline bool arch_static_branch(struct static_key *key)
{
asm goto("0: brcl 0,0\n"
asm_volatile_goto("0: brcl 0,0\n"
".pushsection __jump_table, \"aw\"\n"
ASM_ALIGN "\n"
ASM_PTR " 0b, %l[label], %0\n"

2
arch/sparc/include/asm/jump_label.h
View file

@ -9,7 +9,7 @@
static __always_inline bool arch_static_branch(struct static_key *key)
{
asm goto("1:\n\t"
asm_volatile_goto("1:\n\t"
"nop\n\t"
"nop\n\t"
".pushsection __jump_table, \"aw\"\n\t"

2
arch/x86/include/asm/cpufeature.h
View file

@ -342,7 +342,7 @@ extern const char * const x86_power_flags[32];
static __always_inline __pure bool __static_cpu_has(u16 bit)
{
#if __GNUC__ > 4 || __GNUC_MINOR__ >= 5
asm goto("1: jmp %l[t_no]\n"
asm_volatile_goto("1: jmp %l[t_no]\n"
"2:\n"
".section .altinstructions,\"a\"\n"
" .long 1b - .\n"

2
arch/x86/include/asm/jump_label.h
View file

@ -13,7 +13,7 @@
static __always_inline bool arch_static_branch(struct static_key *key)
{
asm goto("1:"
asm_volatile_goto("1:"
STATIC_KEY_INITIAL_NOP
".pushsection __jump_table, \"aw\" \n\t"
_ASM_ALIGN "\n\t"

16
include/linux/compiler-gcc4.h
View file

@ -31,6 +31,22 @@
#define __linktime_error(message) __attribute__((__error__(message)))
/*
* GCC 'asm goto' miscompiles certain code sequences:
*
* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
*
* Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
* Fixed in GCC 4.8.2 and later versions.
*
* (asm goto is automatically volatile - the naming reflects this.)
*/
#if GCC_VERSION <= 40801
# define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0)
#else
# define asm_volatile_goto(x...) do { asm goto(x); } while (0)
#endif
#if __GNUC_MINOR__ >= 5
/*
* Mark a position in code as unreachable. This can be used to