s390/vdso: map vdso above stack

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In the current code vdso is mapped below the stack. This is
problematic when programs mapped to the top of the address space
are allocating a lot of memory, because the heap will clash with
the vdso. To avoid this map the vdso above the stack and move
STACK_TOP so that it all fits into three level paging.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Sven Schnelle 2022-04-06 08:44:49 +02:00 • committed by Heiko Carstens

parent 57761da4dc

commit 9e37a2e854

2 changed files with 5 additions and 4 deletions

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7

arch/s390/include/asm/processor.h

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2

arch/s390/kernel/vdso.c

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