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s390/mm: make TASK_SIZE independent from the number of page table levels

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The TASK_SIZE for a process should be maximum possible size of the address
space, 2GB for a 31-bit process and 8PB for a 64-bit process. The number
of page table levels required for a given memory layout is a consequence
of the mapped memory areas and their location.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2017-04-20 14:43:51 +02:00
parent 5037c22c53
commit ee71d16d22
7 changed files with 21 additions and 33 deletions
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9
arch/s390/include/asm/processor.h
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@@ -91,14 +91,15 @@ extern void execve_tail(void);
* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
*/
#define TASK_SIZE_OF(tsk) ((tsk)->mm ? \
(tsk)->mm->context.asce_limit : TASK_MAX_SIZE)
#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_31BIT) ? \
(1UL << 31) : (1UL << 53))
#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
(1UL << 30) : (1UL << 41))
#define TASK_SIZE TASK_SIZE_OF(current)
#define TASK_MAX_SIZE (1UL << 53)
#define TASK_SIZE_MAX (1UL << 53)
#define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
#define STACK_TOP (test_thread_flag(TIF_31BIT) ? \
(1UL << 31) : (1UL << 42))
#define STACK_TOP_MAX (1UL << 42)
#define HAVE_ARCH_PICK_MMAP_LAYOUT