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authorAlexey Dobriyan <adobriyan@gmail.com>2022-01-20 05:08:53 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-20 09:52:53 +0300
commit70ac69928e9717a313a4c72647ebe80663e397a3 (patch)
tree538a2bfeb2b815a3c903ac238ac3c279aa11761a /lib
parent26d98e9f78da8e49413b1cb6bcd0d63ac03b8c85 (diff)
downloadlinux-70ac69928e9717a313a4c72647ebe80663e397a3.tar.xz
kstrtox: uninline everything
I've made a mistake of looking into lib/kstrtox.o code generation. The only function remotely performance critical is _parse_integer() (via /proc/*/map_files/*), everything else is not. Uninline everything, shrink lib/kstrtox.o by ~20 % ! Space savings on x86_64: add/remove: 0/0 grow/shrink: 0/23 up/down: 0/-1269 (-1269 !!!) Function old new delta kstrtoull 16 13 -3 kstrtouint 59 48 -11 kstrtou8 60 49 -11 kstrtou16 61 50 -11 _kstrtoul 46 35 -11 kstrtoull_from_user 95 83 -12 kstrtoul_from_user 95 83 -12 kstrtoll 93 80 -13 kstrtouint_from_user 124 83 -41 kstrtou8_from_user 125 83 -42 kstrtou16_from_user 126 83 -43 kstrtos8 101 50 -51 kstrtos16 102 51 -51 kstrtoint 100 49 -51 _kstrtol 93 35 -58 kstrtobool_from_user 156 75 -81 kstrtoll_from_user 165 83 -82 kstrtol_from_user 165 83 -82 kstrtoint_from_user 172 83 -89 kstrtos8_from_user 173 83 -90 kstrtos16_from_user 174 83 -91 _parse_integer 136 10 -126 _kstrtoull 308 101 -207 Total: Before=3421236, After=3419967, chg -0.04% Link: https://lkml.kernel.org/r/YZDsFDhHst4m2Pnt@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/kstrtox.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/kstrtox.c b/lib/kstrtox.c
index 059b8b00dc53..886510d248e5 100644
--- a/lib/kstrtox.c
+++ b/lib/kstrtox.c
@@ -22,6 +22,7 @@
#include "kstrtox.h"
+noinline
const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
{
if (*base == 0) {
@@ -47,6 +48,7 @@ const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
*
* Don't you dare use this function.
*/
+noinline
unsigned int _parse_integer_limit(const char *s, unsigned int base, unsigned long long *p,
size_t max_chars)
{
@@ -85,6 +87,7 @@ unsigned int _parse_integer_limit(const char *s, unsigned int base, unsigned lon
return rv;
}
+noinline
unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p)
{
return _parse_integer_limit(s, base, p, INT_MAX);
@@ -125,6 +128,7 @@ static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
* Preferred over simple_strtoull(). Return code must be checked.
*/
+noinline
int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
{
if (s[0] == '+')
@@ -148,6 +152,7 @@ EXPORT_SYMBOL(kstrtoull);
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
* Preferred over simple_strtoll(). Return code must be checked.
*/
+noinline
int kstrtoll(const char *s, unsigned int base, long long *res)
{
unsigned long long tmp;
@@ -219,6 +224,7 @@ EXPORT_SYMBOL(_kstrtol);
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
* Preferred over simple_strtoul(). Return code must be checked.
*/
+noinline
int kstrtouint(const char *s, unsigned int base, unsigned int *res)
{
unsigned long long tmp;
@@ -249,6 +255,7 @@ EXPORT_SYMBOL(kstrtouint);
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
* Preferred over simple_strtol(). Return code must be checked.
*/
+noinline
int kstrtoint(const char *s, unsigned int base, int *res)
{
long long tmp;
@@ -264,6 +271,7 @@ int kstrtoint(const char *s, unsigned int base, int *res)
}
EXPORT_SYMBOL(kstrtoint);
+noinline
int kstrtou16(const char *s, unsigned int base, u16 *res)
{
unsigned long long tmp;
@@ -279,6 +287,7 @@ int kstrtou16(const char *s, unsigned int base, u16 *res)
}
EXPORT_SYMBOL(kstrtou16);
+noinline
int kstrtos16(const char *s, unsigned int base, s16 *res)
{
long long tmp;
@@ -294,6 +303,7 @@ int kstrtos16(const char *s, unsigned int base, s16 *res)
}
EXPORT_SYMBOL(kstrtos16);
+noinline
int kstrtou8(const char *s, unsigned int base, u8 *res)
{
unsigned long long tmp;
@@ -309,6 +319,7 @@ int kstrtou8(const char *s, unsigned int base, u8 *res)
}
EXPORT_SYMBOL(kstrtou8);
+noinline
int kstrtos8(const char *s, unsigned int base, s8 *res)
{
long long tmp;
@@ -333,6 +344,7 @@ EXPORT_SYMBOL(kstrtos8);
* [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value
* pointed to by res is updated upon finding a match.
*/
+noinline
int kstrtobool(const char *s, bool *res)
{
if (!s)