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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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34
arch/sh/mm/extable_64.c
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@@ -10,6 +10,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/bsearch.h>
#include <linux/rwsem.h>
#include <linux/extable.h>
#include <linux/uaccess.h>
@@ -40,10 +41,23 @@ static const struct exception_table_entry *check_exception_ranges(unsigned long
return NULL;
}
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 > _elt->insn)
return 1;
if (_key < _elt->insn)
return -1;
return 0;
}
/* Simple binary search */
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)
{
const struct exception_table_entry *mid;
@@ -52,20 +66,8 @@ search_extable(const struct exception_table_entry *first,
if (mid)
return mid;
while (first <= last) {
long diff;
mid = (last - first) / 2 + first;
diff = mid->insn - value;
if (diff == 0)
return mid;
else if (diff < 0)
first = mid+1;
else
last = mid-1;
}
return NULL;
return bsearch(&value, base, num,
sizeof(struct exception_table_entry), cmp_ex_search);
}
int fixup_exception(struct pt_regs *regs)