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authorAndi Kleen <ak@linux.intel.com>2017-05-09 01:58:56 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-09 03:15:14 +0300
commitf44a2920c84af809883ecbbd08d47fb5fe47c8ad (patch)
tree20ad3b3e649d3b7f63abf14a37ec979e1cf35ac2
parent68b43744c1fb3f86238527a696c0dc5f2bd6ea1b (diff)
downloadlinux-f44a2920c84af809883ecbbd08d47fb5fe47c8ad.tar.xz
include/linux/uaccess.h: remove expensive WARN_ON in pagefault_disabled_dec
pagefault_disabled_dec is frequently used inline, and it has a WARN_ON for underflow that expands to about 6.5k of extra code. The warning doesn't seem to be that useful and worth so much code so remove it. If it was needed could make it depending on some debug kernel option. Saves ~6.5k in my kernel text data bss dec hex filename 9039417 5367568 11116544 25523529 1857549 vmlinux-before-pf 9032805 5367568 11116544 25516917 1855b75 vmlinux-pf Link: http://lkml.kernel.org/r/20170315021431.13107-8-andi@firstfloor.org Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/uaccess.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index e0cbfb09e60f..201418d5e15c 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -203,7 +203,6 @@ static __always_inline void pagefault_disabled_inc(void)
static __always_inline void pagefault_disabled_dec(void)
{
current->pagefault_disabled--;
- WARN_ON(current->pagefault_disabled < 0);
}
/*