From f44a2920c84af809883ecbbd08d47fb5fe47c8ad Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Mon, 8 May 2017 15:58:56 -0700 Subject: [PATCH] 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/uaccess.h | 1 - 1 file changed, 1 deletion(-) 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); } /*