diff options
Diffstat (limited to 'arch/tile/mm/fault.c')
| -rw-r--r-- | arch/tile/mm/fault.c | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c index 22e58f51ed23..84ce7abbf5af 100644 --- a/arch/tile/mm/fault.c +++ b/arch/tile/mm/fault.c @@ -187,7 +187,7 @@ static pgd_t *get_current_pgd(void) HV_Context ctx = hv_inquire_context(); unsigned long pgd_pfn = ctx.page_table >> PAGE_SHIFT; struct page *pgd_page = pfn_to_page(pgd_pfn); - BUG_ON(PageHighMem(pgd_page)); /* oops, HIGHPTE? */ + BUG_ON(PageHighMem(pgd_page)); return (pgd_t *) __va(ctx.page_table); } @@ -273,11 +273,15 @@ static int handle_page_fault(struct pt_regs *regs, int si_code; int is_kernel_mode; pgd_t *pgd; + unsigned int flags; /* on TILE, protection faults are always writes */ if (!is_page_fault) write = 1; + flags = (FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE | + (write ? FAULT_FLAG_WRITE : 0)); + is_kernel_mode = (EX1_PL(regs->ex1) != USER_PL); tsk = validate_current(); @@ -382,6 +386,8 @@ static int handle_page_fault(struct pt_regs *regs, vma = NULL; /* happy compiler */ goto bad_area_nosemaphore; } + +retry: down_read(&mm->mmap_sem); } @@ -429,7 +435,11 @@ good_area: * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(mm, vma, address, write); + fault = handle_mm_fault(mm, vma, address, flags); + + if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) + return 0; + if (unlikely(fault & VM_FAULT_ERROR)) { if (fault & VM_FAULT_OOM) goto out_of_memory; @@ -437,10 +447,22 @@ good_area: goto do_sigbus; BUG(); } - if (fault & VM_FAULT_MAJOR) - tsk->maj_flt++; - else - tsk->min_flt++; + if (flags & FAULT_FLAG_ALLOW_RETRY) { + if (fault & VM_FAULT_MAJOR) + tsk->maj_flt++; + else + tsk->min_flt++; + 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 CHIP_HAS_TILE_DMA() || CHIP_HAS_SN_PROC() /* |