s390/cio/ioasm: Fix __xsch() condition code handling

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commit f0edc8f113 upstream.

For the __xsch() inline assembly the conversion to flag output macros is
incomplete. Only the conditional shift of the return value was added, while
the required changes to the inline assembly itself are missing.

If compiled with GCC versions before 14.2 this leads to a double shift of
the cc output operand and therefore the returned value of __xsch() is
incorrectly always zero, instead of the expected condition code.

Fixes: e200565d43 ("s390/cio/ioasm: Convert to use flag output macros")
Cc: stable@vger.kernel.org
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Heiko Carstens 2025-09-25 10:45:17 +02:00 • committed by Greg Kroah-Hartman

parent c5117131b4

commit 0a50182e6a

1 changed files with 3 additions and 4 deletions

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drivers/s390/cio/ioasm.c

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