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lib/bsearch: Provide __always_inline variant

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For code that needs the ultimate performance (it can inline the @cmp
function too) or simply needs to avoid calling external functions for
whatever reason, provide an __always_inline variant of bsearch().

[ tglx: Renamed to __inline_bsearch() as suggested by Andy ]

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200505135313.624443814@linutronix.de
This commit is contained in:
Peter Zijlstra 2020-02-19 18:25:09 +01:00 committed by Thomas Gleixner
parent ef882bfef9
commit df65bba1dc
2 changed files with 26 additions and 22 deletions
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26
include/linux/bsearch.h
View File

@ -4,7 +4,29 @@
#include <linux/types.h>
void *bsearch(const void *key, const void *base, size_t num, size_t size,
cmp_func_t cmp);
static __always_inline
void *__inline_bsearch(const void *key, const void *base, size_t num, size_t size, cmp_func_t cmp)
{
const char *pivot;
int result;
while (num > 0) {
pivot = base + (num >> 1) * size;
result = cmp(key, pivot);
if (result == 0)
return (void *)pivot;
if (result > 0) {
base = pivot + size;
num--;
}
num >>= 1;
}
return NULL;
}
extern void *bsearch(const void *key, const void *base, size_t num, size_t size, cmp_func_t cmp);
#endif /* _LINUX_BSEARCH_H */

22
lib/bsearch.c
View File

@ -28,27 +28,9 @@
* the key and elements in the array are of the same type, you can use
* the same comparison function for both sort() and bsearch().
*/
void *bsearch(const void *key, const void *base, size_t num, size_t size,
cmp_func_t cmp)
void *bsearch(const void *key, const void *base, size_t num, size_t size, cmp_func_t cmp)
{
const char *pivot;
int result;
while (num > 0) {
pivot = base + (num >> 1) * size;
result = cmp(key, pivot);
if (result == 0)
return (void *)pivot;
if (result > 0) {
base = pivot + size;
num--;
}
num >>= 1;
}
return NULL;
return __inline_bsearch(key, base, num, size, cmp);
}
EXPORT_SYMBOL(bsearch);
NOKPROBE_SYMBOL(bsearch);