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s390/extable: search amode31 extable last

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It is very unlikely that an exception happens within the amode31 text
section, therefore safe a couple of cycles for the common case, and
search the amode31 extable last.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2022-02-28 10:53:34 +01:00 committed by Vasily Gorbik
parent a156f09c90
commit 1952954569
1 changed files with 6 additions and 6 deletions
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12
arch/s390/mm/fault.c
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@ -230,13 +230,13 @@ static noinline void do_sigsegv(struct pt_regs *regs, int si_code)
const struct exception_table_entry *s390_search_extables(unsigned long addr)
{
const struct exception_table_entry *fixup;
size_t num;
fixup = search_extable(__start_amode31_ex_table,
__stop_amode31_ex_table - __start_amode31_ex_table,
addr);
if (!fixup)
fixup = search_exception_tables(addr);
return fixup;
fixup = search_exception_tables(addr);
if (fixup)
return fixup;
num = __stop_amode31_ex_table - __start_amode31_ex_table;
return search_extable(__start_amode31_ex_table, num, addr);
}
static noinline void do_no_context(struct pt_regs *regs)