redonkable
/
remarkable-linux
1
0
Fork 0
Code Releases Activity

mm: allow preemption in apply_to_pte_range 

Impact: allow preemption in apply_to_pte_range updates to init_mm

Preemption is now allowed for lazy mmu mode, so don't disable
it for the inner loop of apply_to_pte_range.  This only applies
when doing updates to init_mm; user pagetables are still modified
under the pte lock, so preemption is disabled anyway.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
wifi-calibration
Jeremy Fitzhardinge 2009-02-18 00:11:28 -08:00
parent 2829b44927
commit 252a6bf2a3
1 changed files with 0 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
mm/memory.c
View File

@ -1718,7 +1718,6 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
BUG_ON(pmd_huge(*pmd));
preempt_disable();
arch_enter_lazy_mmu_mode();
token = pmd_pgtable(*pmd);
@ -1730,7 +1729,6 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
} while (pte++, addr += PAGE_SIZE, addr != end);
arch_leave_lazy_mmu_mode();
preempt_enable();
if (mm != &init_mm)
pte_unmap_unlock(pte-1, ptl);