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authorAlexey Dobriyan <adobriyan@gmail.com>2023-10-27 17:13:58 +0300
committerPetr Mladek <pmladek@suse.com>2023-11-01 17:55:39 +0300
commit72fcce70faf06dd7442bf0b41b71f071d7fa29a4 (patch)
tree9fd2191e260b19a7682517db62b6ab33595d8cd5 /lib
parent3f6074cf467f6c2beb7db0b0d685fb53f25ae9aa (diff)
downloadlinux-72fcce70faf06dd7442bf0b41b71f071d7fa29a4.tar.xz
vsprintf: uninline simple_strntoull(), reorder arguments
* uninline simple_strntoull(), gcc overinlines and this function is not performance critical * reorder arguments, so that appending INT_MAX as 4th argument generates very efficient tail call Space savings: add/remove: 1/0 grow/shrink: 0/3 up/down: 27/-179 (-152) Function old new delta simple_strntoll - 27 +27 simple_strtoull 15 10 -5 simple_strtoll 41 7 -34 vsscanf 1930 1790 -140 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/all/82a2af6e-9b6c-4a09-89d7-ca90cc1cdad1@p183/
Diffstat (limited to 'lib')
-rw-r--r--lib/vsprintf.c25
1 files changed, 12 insertions, 13 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index afb88b24fa74..3e3733a7084f 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -60,7 +60,8 @@
bool no_hash_pointers __ro_after_init;
EXPORT_SYMBOL_GPL(no_hash_pointers);
-static noinline unsigned long long simple_strntoull(const char *startp, size_t max_chars, char **endp, unsigned int base)
+noinline
+static unsigned long long simple_strntoull(const char *startp, char **endp, unsigned int base, size_t max_chars)
{
const char *cp;
unsigned long long result = 0ULL;
@@ -95,7 +96,7 @@ static noinline unsigned long long simple_strntoull(const char *startp, size_t m
noinline
unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
{
- return simple_strntoull(cp, INT_MAX, endp, base);
+ return simple_strntoull(cp, endp, base, INT_MAX);
}
EXPORT_SYMBOL(simple_strtoull);
@@ -130,8 +131,8 @@ long simple_strtol(const char *cp, char **endp, unsigned int base)
}
EXPORT_SYMBOL(simple_strtol);
-static long long simple_strntoll(const char *cp, size_t max_chars, char **endp,
- unsigned int base)
+noinline
+static long long simple_strntoll(const char *cp, char **endp, unsigned int base, size_t max_chars)
{
/*
* simple_strntoull() safely handles receiving max_chars==0 in the
@@ -140,9 +141,9 @@ static long long simple_strntoll(const char *cp, size_t max_chars, char **endp,
* and the content of *cp is irrelevant.
*/
if (*cp == '-' && max_chars > 0)
- return -simple_strntoull(cp + 1, max_chars - 1, endp, base);
+ return -simple_strntoull(cp + 1, endp, base, max_chars - 1);
- return simple_strntoull(cp, max_chars, endp, base);
+ return simple_strntoull(cp, endp, base, max_chars);
}
/**
@@ -155,7 +156,7 @@ static long long simple_strntoll(const char *cp, size_t max_chars, char **endp,
*/
long long simple_strtoll(const char *cp, char **endp, unsigned int base)
{
- return simple_strntoll(cp, INT_MAX, endp, base);
+ return simple_strntoll(cp, endp, base, INT_MAX);
}
EXPORT_SYMBOL(simple_strtoll);
@@ -3648,13 +3649,11 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
break;
if (is_sign)
- val.s = simple_strntoll(str,
- field_width >= 0 ? field_width : INT_MAX,
- &next, base);
+ val.s = simple_strntoll(str, &next, base,
+ field_width >= 0 ? field_width : INT_MAX);
else
- val.u = simple_strntoull(str,
- field_width >= 0 ? field_width : INT_MAX,
- &next, base);
+ val.u = simple_strntoull(str, &next, base,
+ field_width >= 0 ? field_width : INT_MAX);
switch (qualifier) {
case 'H': /* that's 'hh' in format */