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authorWill Deacon <will.deacon@arm.com>2010-05-24 12:11:43 -0700
committerIngo Molnar <mingo@elte.hu>2010-06-25 16:11:50 +0200
commit0d98bb2656e9bd2dfda2d089db1fe1dbdab41504 (patch)
tree2172bbdd7fb21640062b2a692ded3d9cebc2382c /init
parent3c93717cfa51316e4dbb471e7c0f9d243359d5f8 (diff)
sched: Prevent compiler from optimising the sched_avg_update() loop
GCC 4.4.1 on ARM has been observed to replace the while loop in sched_avg_update with a call to uldivmod, resulting in the following build failure at link-time: kernel/built-in.o: In function `sched_avg_update': kernel/sched.c:1261: undefined reference to `__aeabi_uldivmod' kernel/sched.c:1261: undefined reference to `__aeabi_uldivmod' make: *** [.tmp_vmlinux1] Error 1 This patch introduces a fake data hazard to the loop body to prevent the compiler optimising the loop away. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: <stable@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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