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authorGeliang Tang <geliangtang@163.com>2015-11-05 18:48:38 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-05 19:34:48 -0800
commitc9427bc043da23de03d142c3c87ce4a57297c471 (patch)
tree6bf0e3c64dbcbbcf5c3d47bae6521acaf5ff2880 /mm/nommu.c
parent1e3ee14b9355a688ffe24725fa746ab120c42881 (diff)
downloadlinux-c9427bc043da23de03d142c3c87ce4a57297c471.tar.bz2
mm/nommu.c: drop unlikely inside BUG_ON()
(1) For !CONFIG_BUG cases, the bug call is a no-op, so we couldn't care less and the change is ok. (2) ppc and mips, which HAVE_ARCH_BUG_ON, do not rely on branch predictions as it seems to be pointless[1] and thus callers should not be trying to push an optimization in the first place. (3) For CONFIG_BUG and !HAVE_ARCH_BUG_ON cases, BUG_ON() contains an unlikely compiler flag already. Hence, we can drop unlikely behind BUG_ON(). [1] http://lkml.iu.edu/hypermail/linux/kernel/1101.3/02289.html Signed-off-by: Geliang Tang <geliangtang@163.com> Acked-by: Davidlohr Bueso <dave@stgolabs.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/nommu.c')
-rw-r--r--mm/nommu.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index 1e0f1688d9a4..92be862c859b 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -578,16 +578,16 @@ static noinline void validate_nommu_regions(void)
return;
last = rb_entry(lastp, struct vm_region, vm_rb);
- BUG_ON(unlikely(last->vm_end <= last->vm_start));
- BUG_ON(unlikely(last->vm_top < last->vm_end));
+ BUG_ON(last->vm_end <= last->vm_start);
+ BUG_ON(last->vm_top < last->vm_end);
while ((p = rb_next(lastp))) {
region = rb_entry(p, struct vm_region, vm_rb);
last = rb_entry(lastp, struct vm_region, vm_rb);
- BUG_ON(unlikely(region->vm_end <= region->vm_start));
- BUG_ON(unlikely(region->vm_top < region->vm_end));
- BUG_ON(unlikely(region->vm_start < last->vm_top));
+ BUG_ON(region->vm_end <= region->vm_start);
+ BUG_ON(region->vm_top < region->vm_end);
+ BUG_ON(region->vm_start < last->vm_top);
lastp = p;
}