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| author | Andi Kleen <ak@linux.intel.com> | 2017-05-09 00:58:56 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-09 02:15:14 +0200 |
| commit | f44a2920c84af809883ecbbd08d47fb5fe47c8ad (patch) | |
| tree | 20ad3b3e649d3b7f63abf14a37ec979e1cf35ac2 | |
| parent | drivers/scsi/megaraid: remove expensive inline from megasas_return_cmd (diff) | |
| download | linux-f44a2920c84af809883ecbbd08d47fb5fe47c8ad.tar.xz linux-f44a2920c84af809883ecbbd08d47fb5fe47c8ad.zip | |
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.h | 1 |
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); } /* |