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| author |   Paul Mundt <lethal@linux-sh.org> | 2012-04-11 12:44:50 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2012-04-11 12:44:50 +0900 |
| commit | a1e2030122d4c2605089e60dce28d2fcf9c3ef98 (patch) | |
| tree | a5617a89aca5b81501920822cbc3cdaedbbe665a | |
| parent | sh/mm/fault_32.c: Port OOM changes to do_page_fault (diff) | |
| download | linux-dev-a1e2030122d4c2605089e60dce28d2fcf9c3ef98.tar.xz linux-dev-a1e2030122d4c2605089e60dce28d2fcf9c3ef98.zip | |
sh64: Port OOM changes to do_page_fault
Reflect the sh32 OOM changes for the sh64 page fault handler, too.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
| -rw-r--r-- | arch/sh/mm/tlbflush_64.c | 40 |
1 files changed, 30 insertions, 10 deletions
diff --git a/arch/sh/mm/tlbflush_64.c b/arch/sh/mm/tlbflush_64.c index 11c5a18f10ed..70b3c271aa9f 100644 --- a/arch/sh/mm/tlbflush_64.c +++ b/arch/sh/mm/tlbflush_64.c @@ -3,7 +3,7 @@ * * Copyright (C) 2000, 2001 Paolo Alberelli * Copyright (C) 2003 Richard Curnow (/proc/tlb, bug fixes) - * Copyright (C) 2003 - 2009 Paul Mundt + * Copyright (C) 2003 - 2012 Paul Mundt * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive @@ -95,6 +95,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess, struct mm_struct *mm; struct vm_area_struct * vma; const struct exception_table_entry *fixup; + unsigned int flags = (FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE | + (writeaccess ? FAULT_FLAG_WRITE : 0)); pte_t *pte; int fault; @@ -124,6 +126,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess, if (in_atomic() || !mm) goto no_context; +retry: /* TLB misses upon some cache flushes get done under cli() */ down_read(&mm->mmap_sem); @@ -188,7 +191,11 @@ good_area: * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(mm, vma, address, writeaccess ? FAULT_FLAG_WRITE : 0); + fault = handle_mm_fault(mm, vma, address, flags); + + if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) + return; + if (unlikely(fault & VM_FAULT_ERROR)) { if (fault & VM_FAULT_OOM) goto out_of_memory; @@ -197,14 +204,27 @@ good_area: BUG(); } - if (fault & VM_FAULT_MAJOR) { - tsk->maj_flt++; - perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, - regs, address); - } else { - tsk->min_flt++; - perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, - regs, address); + if (flags & FAULT_FLAG_ALLOW_RETRY) { + if (fault & VM_FAULT_MAJOR) { + tsk->maj_flt++; + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, + regs, address); + } else { + tsk->min_flt++; + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, + regs, address); + } + + if (fault & VM_FAULT_RETRY) { + flags &= ~FAULT_FLAG_ALLOW_RETRY; + + /* + * No need to up_read(&mm->mmap_sem) as we would + * have already released it in __lock_page_or_retry + * in mm/filemap.c. + */ + goto retry; + } } /* If we get here, the page fault has been handled. Do the TLB refill |