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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2012-07-27 08:54:20 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-07-30 11:03:08 +0200 |
| commit | f2c76e3b6f72c3fda290998109594dc490b8b087 (patch) | |
| tree | c82f073d8c61ff212e34c90e8f3090abbb7ac967 /arch/s390/mm | |
| parent | 216550e4fd5ade3f255bd5460db6b59e57f5f8c2 (diff) | |
| download | linux-f2c76e3b6f72c3fda290998109594dc490b8b087.tar.gz | |
s390/mm: make page faults killable
This is the s390 variant of 37b23e05 "x86,mm: make pagefault killable". Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/fault.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 6a12d1bb6e09..2a34a1c35a7c 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -49,6 +49,7 @@ #define VM_FAULT_BADCONTEXT 0x010000 #define VM_FAULT_BADMAP 0x020000 #define VM_FAULT_BADACCESS 0x040000 +#define VM_FAULT_SIGNAL 0x080000 static unsigned long store_indication; @@ -229,6 +230,10 @@ static noinline void do_fault_error(struct pt_regs *regs, int fault) case VM_FAULT_BADCONTEXT: do_no_context(regs); break; + case VM_FAULT_SIGNAL: + if (!user_mode(regs)) + do_no_context(regs); + break; default: /* fault & VM_FAULT_ERROR */ if (fault & VM_FAULT_OOM) { if (!(regs->psw.mask & PSW_MASK_PSTATE)) @@ -286,7 +291,7 @@ static inline int do_exception(struct pt_regs *regs, int access) address = trans_exc_code & __FAIL_ADDR_MASK; perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); - flags = FAULT_FLAG_ALLOW_RETRY; + flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; if (access == VM_WRITE || (trans_exc_code & store_indication) == 0x400) flags |= FAULT_FLAG_WRITE; down_read(&mm->mmap_sem); @@ -335,6 +340,11 @@ retry: * the fault. */ fault = handle_mm_fault(mm, vma, address, flags); + /* No reason to continue if interrupted by SIGKILL. */ + if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) { + fault = VM_FAULT_SIGNAL; + goto out; + } if (unlikely(fault & VM_FAULT_ERROR)) goto out_up; |