From: Davidlohr Bueso <dave@xxxxxxxxxxxx>
This becomes quite straightforward with the mmrange in place.
Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
---
arch/m32r/mm/fault.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/m32r/mm/fault.c b/arch/m32r/mm/fault.c
index 0129aea46729..2c6b58ecfc53 100644
--- a/arch/m32r/mm/fault.c
+++ b/arch/m32r/mm/fault.c
@@ -137,11 +137,11 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
* source. If this is invalid we can skip the address space check,
* thus avoiding the deadlock.
*/
- if (!down_read_trylock(&mm->mmap_sem)) {
+ if (!mm_read_trylock(mm, &mmrange)) {
if ((error_code & ACE_USERMODE) == 0 &&
!search_exception_tables(regs->psw))
goto bad_area_nosemaphore;
- down_read(&mm->mmap_sem);
+ mm_read_lock(mm, &mmrange);
}
vma = find_vma(mm, address);
@@ -213,7 +213,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
else
tsk->min_flt++;
set_thread_fault_code(0);
- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);
return;
/*
@@ -221,7 +221,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
* Fix it, but check if it's kernel or user first..
*/
bad_area:
- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);
bad_area_nosemaphore:
/* User mode accesses just cause a SIGSEGV */
@@ -274,14 +274,14 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
* us unable to handle the page fault gracefully.
*/
out_of_memory:
- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);
if (!(error_code & ACE_USERMODE))
goto no_context;
pagefault_out_of_memory();
return;
do_sigbus:
- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);
/* Kernel mode? Handle exception or die */
if (!(error_code & ACE_USERMODE))
--
2.13.6
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