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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-10-07 12:12:32 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-10-24 17:17:00 +0200 |
| commit | 127c1feffff8078400f01372712c600d0f9eef51 (patch) | |
| tree | 70c6b13e0b483459bf5e6669ac0973b35bab7c48 /arch/s390/mm/pageattr.c | |
| parent | s390/bpf,jit: fix prolog oddity (diff) | |
| download | linux-127c1feffff8078400f01372712c600d0f9eef51.tar.xz linux-127c1feffff8078400f01372712c600d0f9eef51.zip | |
s390/mm: do not initialize storage keys
With dirty and referenced bits implemented in software it is unnecessary
to initialize the storage key for every page. With this patch not a single
storage key operation is done for a system that does not use KVM.
For KVM set_pte_at/pgste_set_key will do the initialization for the guest
view of the storage key when the mapping for the page is established in
the host.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/pageattr.c')
| -rw-r--r-- | arch/s390/mm/pageattr.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c index 990397420e6b..8400f494623f 100644 --- a/arch/s390/mm/pageattr.c +++ b/arch/s390/mm/pageattr.c @@ -9,6 +9,7 @@ #include <asm/pgtable.h> #include <asm/page.h> +#if PAGE_DEFAULT_KEY static inline unsigned long sske_frame(unsigned long addr, unsigned char skey) { asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0" @@ -16,7 +17,7 @@ static inline unsigned long sske_frame(unsigned long addr, unsigned char skey) return addr; } -void storage_key_init_range(unsigned long start, unsigned long end) +void __storage_key_init_range(unsigned long start, unsigned long end) { unsigned long boundary, size; @@ -36,6 +37,7 @@ void storage_key_init_range(unsigned long start, unsigned long end) start += PAGE_SIZE; } } +#endif static pte_t *walk_page_table(unsigned long addr) { |