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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-10-24 10:52:29 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-10-27 13:27:30 +0100 |
| commit | fcbe08d66f57c368e77ca729dd01e6b539ffb3ff (patch) | |
| tree | 202c07aac6f67b5b34372da6f80cf9baa773e307 /arch/s390/include | |
| parent | s390/mm: missing pte for gmap_ipte_notify should trigger a VM_BUG (diff) | |
| download | linux-fcbe08d66f57c368e77ca729dd01e6b539ffb3ff.tar.xz linux-fcbe08d66f57c368e77ca729dd01e6b539ffb3ff.zip | |
s390/mm: pmdp_get_and_clear_full optimization
Analog to ptep_get_and_clear_full define a variant of the
pmpd_get_and_clear primitive which gets the full hint from the
mmu_gather struct. This allows s390 to avoid a costly instruction
when destroying an address space.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 5ef1a266936a..5e102422c9ab 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1651,6 +1651,19 @@ static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, return pmd; } +#define __HAVE_ARCH_PMDP_GET_AND_CLEAR_FULL +static inline pmd_t pmdp_get_and_clear_full(struct mm_struct *mm, + unsigned long address, + pmd_t *pmdp, int full) +{ + pmd_t pmd = *pmdp; + + if (!full) + pmdp_flush_lazy(mm, address, pmdp); + pmd_clear(pmdp); + return pmd; +} + #define __HAVE_ARCH_PMDP_CLEAR_FLUSH static inline pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) |