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(parent: a400593) | patch
s390/percpu: add READ_ONCE() to arch_this_cpu_to_op_simple()
authorHeiko Carstens <hca@linux.ibm.com>
Mon, 9 Jan 2023 10:51:20 +0000 (11:51 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 18 Jan 2023 10:48:49 +0000 (11:48 +0100)
commit798dfeeae33deefb60ddcb522214480b885f175d
tree3cc993b0b943fbe634adf81de57cb786c37e4397tree | snapshot
parenta400593eb373cbd5301178321dbcec94512ae8f1commit | diff
s390/percpu: add READ_ONCE() to arch_this_cpu_to_op_simple()

commit e3f360db08d55a14112bd27454e616a24296a8b0 upstream.

Make sure that *ptr__ within arch_this_cpu_to_op_simple() is only
dereferenced once by using READ_ONCE(). Otherwise the compiler could
generate incorrect code.

Cc: <stable@vger.kernel.org>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/s390/include/asm/percpu.h diff | blob | history
Domain: System / Kernel;