tree 8479d93b260826a01e85a9669e7ec88fa7b5fb36
parent b09757104e433447226a95eff4b92583acc0b0fb
author Peter Rosin <peda@axentia.se> 1563319638 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1563330202 -0700

lib/test_string.c: avoid masking memset16/32/64 failures

If a memsetXX implementation is completely broken and fails in the first
iteration, when i, j, and k are all zero, the failure is masked as zero
is returned.  Failing in the first iteration is perhaps the most likely
failure, so this makes the tests pretty much useless.  Avoid the
situation by always setting a random unused bit in the result on
failure.

Link: http://lkml.kernel.org/r/20190506124634.6807-3-peda@axentia.se
Fixes: 03270c13c5ff ("lib/string.c: add testcases for memset16/32/64")
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>