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authorVasily Gorbik <gor@linux.ibm.com>2019-11-25 15:34:59 +0300
committerVasily Gorbik <gor@linux.ibm.com>2019-11-30 12:52:47 +0300
commit4ac24c092b4eef69b2436ee4d478500dc886e8b5 (patch)
treee313e5c73958572c5a3266c0597932aea9403db2 /arch/s390/lib
parentf44fa79b104b56d53d33ae43e69bab98b63d4783 (diff)
downloadlinux-4ac24c092b4eef69b2436ee4d478500dc886e8b5.tar.xz
s390: fix register clobbering in CALL_ON_STACK
CALL_ON_STACK defines and initializes register variables. Inline assembly which follows might trigger compiler to generate memory access for "stack" argument (e.g. in case of S390_lowcore.nodat_stack). This memory access produces a function call under kasan with outline instrumentation which clobbers registers. Switch "stack" argument in CALL_ON_STACK helper to use memory reference constraint and perform load instead. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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