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lib/extable.c: use bsearch() library function in search_extable()

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[thomas@m3y3r.de: v3: fix arch specific implementations]
  Link: http://lkml.kernel.org/r/1497890858.12931.7.camel@m3y3r.de
Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Meyer 2017-07-10 15:51:58 -07:00 • committed by Linus Torvalds
parent 12e8fd6fd3
commit a94c33dd1f
8 changed files with 63 additions and 56 deletions
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41
lib/extable.c
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@ -9,6 +9,7 @@
* 2 of the License, or (at your option) any later version.
*/
#include <linux/bsearch.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sort.h>
@ -51,7 +52,7 @@ static void swap_ex(void *a, void *b, int size)
* This is used both for the kernel exception table and for
* the exception tables of modules that get loaded.
*/
static int cmp_ex(const void *a, const void *b)
static int cmp_ex_sort(const void *a, const void *b)
{
const struct exception_table_entry *x = a, *y = b;
@ -67,7 +68,7 @@ void sort_extable(struct exception_table_entry *start,
struct exception_table_entry *finish)
{
sort(start, finish - start, sizeof(struct exception_table_entry),
cmp_ex, swap_ex);
cmp_ex_sort, swap_ex);
}
#ifdef CONFIG_MODULES
@ -93,6 +94,20 @@ void trim_init_extable(struct module *m)
#endif /* !ARCH_HAS_SORT_EXTABLE */
#ifndef ARCH_HAS_SEARCH_EXTABLE
static int cmp_ex_search(const void *key, const void *elt)
{
const struct exception_table_entry *_elt = elt;
unsigned long _key = *(unsigned long *)key;
/* avoid overflow */
if (_key > ex_to_insn(_elt))
return 1;
if (_key < ex_to_insn(_elt))
return -1;
return 0;
}
/*
* Search one exception table for an entry corresponding to the
* given instruction address, and return the address of the entry,
@ -101,25 +116,11 @@ void trim_init_extable(struct module *m)
* already sorted.
*/
const struct exception_table_entry *
search_extable(const struct exception_table_entry *first,
const struct exception_table_entry *last,
search_extable(const struct exception_table_entry *base,
const size_t num,
unsigned long value)
{
while (first <= last) {
const struct exception_table_entry *mid;
mid = ((last - first) >> 1) + first;
/*
* careful, the distance between value and insn
* can be larger than MAX_LONG:
*/
if (ex_to_insn(mid) < value)
first = mid + 1;
else if (ex_to_insn(mid) > value)
last = mid - 1;
else
return mid;
}
return NULL;
return bsearch(&value, base, num,
sizeof(struct exception_table_entry), cmp_ex_search);
}
#endif