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signal/x86: Don't compute pkey in __do_page_fault 

There are no more users of the computed pkey value in __do_page_fault
so stop computing the value.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-09-18 00:31:24 +02:00
parent 25c102d803
commit 988bbc7b1a
1 changed files with 0 additions and 4 deletions
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4
arch/x86/mm/fault.c
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@ -1216,7 +1216,6 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code,
struct mm_struct *mm;
vm_fault_t fault, major = 0;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
u32 pkey;
tsk = current;
mm = tsk->mm;
@ -1388,10 +1387,7 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code,
* (potentially after handling any pending signal during the return to
* userland). The return to userland is identified whenever
* FAULT_FLAG_USER|FAULT_FLAG_KILLABLE are both set in flags.
* Thus we have to be careful about not touching vma after handling the
* fault, so we read the pkey beforehand.
*/
pkey = vma_pkey(vma);
fault = handle_mm_fault(vma, address, flags);
major |= fault & VM_FAULT_MAJOR;