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authorAlexey Dobriyan <adobriyan@gmail.com>2021-06-30 18:56:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-01 11:06:05 -0700
commitad65dcef3a87c24d6c6156eae5e7b47311d6e3cf (patch)
treeae1fbd368809d911dfd43f38ecd9a38fabb62fe8 /lib
parent1a58be6277e4324c853babfd35890c2d5e171e8f (diff)
downloadlinux-ad65dcef3a87c24d6c6156eae5e7b47311d6e3cf.tar.bz2
lib: uninline simple_strtoull()
Gcc inlines simple_strtoull() too agressively. Given that all 4 signatures match, everything very efficiently calls or tailcalls into simple_strtoull(): ffffffff81da0240 <simple_strtoll>: ffffffff81da0240: 80 3f 2d cmp BYTE PTR [rdi],0x2d ffffffff81da0243: 74 05 je ffffffff81da024a <simple_strtoll+0xa> ffffffff81da0245: e9 76 ff ff ff jmp simple_strtoull ffffffff81da024a: 48 83 c7 01 add rdi,0x1 ffffffff81da024e: e8 6d ff ff ff call simple_strtoull ffffffff81da0253: 48 f7 d8 neg rax ffffffff81da0256: c3 ret Space savings (on F34-ish .config) add/remove: 0/0 grow/shrink: 1/3 up/down: 52/-313 (-261) Function old new delta vsscanf 2167 2219 +52 simple_strtoul 72 2 -70 simple_strtoll 143 23 -120 simple_strtol 143 20 -123 Link: https://lkml.kernel.org/r/YMO2zoOQk2eF34tn@localhost.localdomain Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/vsprintf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index cc281f5895f9..30e1bc22105c 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -61,6 +61,7 @@
*
* This function has caveats. Please use kstrtoull instead.
*/
+noinline
unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
{
unsigned long long result;