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s390: add kmemleak annotation in stack_alloc()
kmemleak with enabled auto scanning reports that our stack allocation is
lost. This is because we're saving the pointer + STACK_INIT_OFFSET to
lowcore. When kmemleak now scans the objects, it thinks that this one is
lost because it can't find a corresponding pointer.
Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Tested-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>