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s390/extable: fix exception table sorting

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commit c194dad21025dfd043210912653baab823bdff67 upstream.

s390 has a swap_ex_entry_fixup function, however it is not being used
since common code expects a swap_ex_entry_fixup define. If it is not
defined the default implementation will be used. So fix this by adding
a proper define.
However also the implementation of the function must be fixed, since a
NULL value for handler has a special meaning and must not be adjusted.

Luckily all of this doesn't fix a real bug currently: the main extable
is correctly sorted during build time, and for runtime sorting there
is currently no case where the handler field is not NULL.

Fixes: 05a68e892e ("s390/kernel: expand exception table logic to allow new handling options")
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heiko Carstens 2022-02-24 22:03:29 +01:00 committed by Greg Kroah-Hartman
parent 49aa9c9c7f
commit 8b20c1999d
1 changed files with 7 additions and 2 deletions
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9
arch/s390/include/asm/extable.h
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@ -69,8 +69,13 @@ static inline void swap_ex_entry_fixup(struct exception_table_entry *a,
{
a->fixup = b->fixup + delta;
b->fixup = tmp.fixup - delta;
a->handler = b->handler + delta;
b->handler = tmp.handler - delta;
a->handler = b->handler;
if (a->handler)
a->handler += delta;
b->handler = tmp.handler;
if (b->handler)
b->handler -= delta;
}
#define swap_ex_entry_fixup swap_ex_entry_fixup
#endif