diff options
| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2013-05-06 21:44:36 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-05-07 14:11:55 +0200 |
| commit | 617e164c35c94c936e3632b387d6dbb3d80c2c02 (patch) | |
| tree | 920158eee8c4a8026f1c9f8e0b9261d828c03833 | |
| parent | s390/disassembler: prevent endless loop in print_fn_code() (diff) | |
| download | linux-617e164c35c94c936e3632b387d6dbb3d80c2c02.tar.xz linux-617e164c35c94c936e3632b387d6dbb3d80c2c02.zip | |
s390: disable pfmf for clear page instruction
Wit the introduction of large pages Linux also used pfmf for page
clearing. The current implementation is not ideal, though:
- currently we set usage intent=0, but cleared pages are often used
directly after the clearing
- z/VM does not yet provide EDAT
- KVM does have to intercept PFMF even for resident pages
Lets just the mvcl loop in all cases until we have a well defined
pattern were pfmf is besser.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | arch/s390/include/asm/page.h | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h index 75ce9b065f9f..5d64fb7619cc 100644 --- a/arch/s390/include/asm/page.h +++ b/arch/s390/include/asm/page.h @@ -32,7 +32,7 @@ void storage_key_init_range(unsigned long start, unsigned long end); -static unsigned long pfmf(unsigned long function, unsigned long address) +static inline unsigned long pfmf(unsigned long function, unsigned long address) { asm volatile( " .insn rre,0xb9af0000,%[function],%[address]" @@ -44,17 +44,13 @@ static unsigned long pfmf(unsigned long function, unsigned long address) static inline void clear_page(void *page) { - if (MACHINE_HAS_PFMF) { - pfmf(0x10000, (unsigned long)page); - } else { - register unsigned long reg1 asm ("1") = 0; - register void *reg2 asm ("2") = page; - register unsigned long reg3 asm ("3") = 4096; - asm volatile( - " mvcl 2,0" - : "+d" (reg2), "+d" (reg3) : "d" (reg1) - : "memory", "cc"); - } + register unsigned long reg1 asm ("1") = 0; + register void *reg2 asm ("2") = page; + register unsigned long reg3 asm ("3") = 4096; + asm volatile( + " mvcl 2,0" + : "+d" (reg2), "+d" (reg3) : "d" (reg1) + : "memory", "cc"); } static inline void copy_page(void *to, void *from) |