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| author |   Rik van Riel <riel@redhat.com> | 2014-09-30 15:59:47 -0400 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2014-10-03 05:46:55 +0200 |
| commit | 347abad981c1ef815ea5ba861adba6a8c6aa1580 (patch) | |
| tree | ea18690dcb71d23c29a92a602c1d5373f9360e7a /arch/powerpc/include/asm/cputime.h | |
| parent | sched: Improve sysbench performance by fixing spurious active migration (diff) | |
| download | linux-dev-347abad981c1ef815ea5ba861adba6a8c6aa1580.tar.xz linux-dev-347abad981c1ef815ea5ba861adba6a8c6aa1580.zip | |
sched, time: Fix build error with 64 bit cputime_t on 32 bit systems
On 32 bit systems cmpxchg cannot handle 64 bit values, so
some additional magic is required to allow a 32 bit system
with CONFIG_VIRT_CPU_ACCOUNTING_GEN=y enabled to build.
Make sure the correct cmpxchg function is used when doing
an atomic swap of a cputime_t.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: umgwanakikbuti@gmail.com
Cc: fweisbec@gmail.com
Cc: srao@redhat.com
Cc: lwoodman@redhat.com
Cc: atheurer@redhat.com
Cc: oleg@redhat.com
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linux390@de.ibm.com
Cc: linux-arch@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-s390@vger.kernel.org
Link: http://lkml.kernel.org/r/20140930155947.070cdb1f@annuminas.surriel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/powerpc/include/asm/cputime.h')
| -rw-r--r-- | arch/powerpc/include/asm/cputime.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/cputime.h b/arch/powerpc/include/asm/cputime.h index 607559ab271f..6c840ceab820 100644 --- a/arch/powerpc/include/asm/cputime.h +++ b/arch/powerpc/include/asm/cputime.h @@ -32,6 +32,8 @@ static inline void setup_cputime_one_jiffy(void) { } typedef u64 __nocast cputime_t; typedef u64 __nocast cputime64_t; +#define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new) + #ifdef __KERNEL__ /* |