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-rw-r--r--arch/tile/mm/fault.c34
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()
/*
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