kref: remove WARN_ON for NULL release functions
authorAndi Kleen <ak@linux.intel.com>
Mon, 8 May 2017 22:58:50 +0000 (15:58 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 9 May 2017 00:15:14 +0000 (17:15 -0700)
commitec48c940da6cb96c4be6638d0f2efade24d5242a
treebdfcf0476548df4f870c72f7704b6706ec316d0f
parente6ccbff0e90cf4bf012bf369dbdaf84c6faaedaa
kref: remove WARN_ON for NULL release functions

The kref functions check for NULL release functions.  This WARN_ON seems
rather pointless.  We will eventually release and then just crash
nicely.  It is also somewhat expensive because these functions are
inlined in a lot of places.  Removing the WARN_ONs saves around 2.3k in
this kernel (likely more in others with more drivers)

     text    data     bss     dec     hex filename
  9083992 5367600 11116544        25568136        1862388 vmlinux-before-load-avg
  9070166 5367600 11116544        25554310        185ed86 vmlinux-load-avg

Link: http://lkml.kernel.org/r/20170315021431.13107-5-andi@firstfloor.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/kref.h