diff options
| author | Will Deacon <will.deacon@arm.com> | 2010-05-24 23:11:43 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-06-25 18:11:50 +0400 |
| commit | 0d98bb2656e9bd2dfda2d089db1fe1dbdab41504 (patch) | |
| tree | 2172bbdd7fb21640062b2a692ded3d9cebc2382c /init/main.c | |
| parent | 3c93717cfa51316e4dbb471e7c0f9d243359d5f8 (diff) | |
| download | linux-0d98bb2656e9bd2dfda2d089db1fe1dbdab41504.tar.xz | |
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>
Diffstat (limited to 'init/main.c')
0 files changed, 0 insertions, 0 deletions