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sched, time: Fix build error with 64 bit cputime_t on 32 bit systems

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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 <[email protected]>
Signed-off-by: Rik van Riel <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Andrew Morton <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Rik van Riel 2014-09-30 15:59:47 -04:00 • committed by Ingo Molnar
commit 347abad981
5 changed files with 27 additions and 10 deletions
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2
include/asm-generic/cputime_jiffies.h
View file

@ -3,6 +3,8 @@
typedef unsigned long __nocast cputime_t;
#define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new)
#define cputime_one_jiffy jiffies_to_cputime(1)
#define cputime_to_jiffies(__ct) (__force unsigned long)(__ct)
#define cputime_to_scaled(__ct) (__ct)

2
include/asm-generic/cputime_nsecs.h
View file

@ -21,6 +21,8 @@
typedef u64 __nocast cputime_t;
typedef u64 __nocast cputime64_t;
#define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new)
#define cputime_one_jiffy jiffies_to_cputime(1)
#define cputime_div(__ct, divisor) div_u64((__force u64)__ct, divisor)