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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>
This commit is contained in:
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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@@ -95,9 +95,10 @@ unsigned long vdso_size(void);
(_REGION3_SIZE >> 1) : (_REGION2_SIZE >> 1))
#define TASK_SIZE_MAX (-PAGE_SIZE)
#define STACK_TOP (test_thread_flag(TIF_31BIT) ? \
_REGION3_SIZE : _REGION2_SIZE)
#define STACK_TOP_MAX _REGION2_SIZE
#define VDSO_BASE (STACK_TOP + PAGE_SIZE)
#define VDSO_LIMIT (test_thread_flag(TIF_31BIT) ? _REGION3_SIZE : _REGION2_SIZE)
#define STACK_TOP (VDSO_LIMIT - vdso_size() - PAGE_SIZE)
#define STACK_TOP_MAX (_REGION2_SIZE - vdso_size() - PAGE_SIZE)
#define HAVE_ARCH_PICK_MMAP_LAYOUT