s390/mmap: take stack_guard_gap into account for mmap_base

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The s390 version of the mmap_base function is ignorant of stack_guard_gap
which can lead to a placement of the stack vs. the mmap base that does not
leave enough space for the stack rlimit.

Add the stack_guard_gap to the calculation and while we are at it the
check for gap+pad overflows as well.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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This commit is contained in:

Martin Schwidefsky 2019-01-29 10:48:09 +01:00

parent d4192437d7

commit a0308c1315

1 changed files with 19 additions and 14 deletions

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arch/s390/mm/mmap.c

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