include/linux/uaccess.h: remove expensive WARN_ON in pagefault_disabled_dec
authorAndi Kleen <ak@linux.intel.com>
Mon, 8 May 2017 22:58:56 +0000 (15:58 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 9 May 2017 00:15:14 +0000 (17:15 -0700)
commitf44a2920c84af809883ecbbd08d47fb5fe47c8ad
tree20ad3b3e649d3b7f63abf14a37ec979e1cf35ac2
parent68b43744c1fb3f86238527a696c0dc5f2bd6ea1b
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>
include/linux/uaccess.h