@@ -27,6 +27,7 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
{
pte_t *ptep;
unsigned long flags;
+ unsigned long pfn;
struct mm_struct *mm;
if (user_mode(regs))
@@ -34,15 +35,21 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
else
mm = &init_mm;
+ start_lockless_pgtbl_walk(mm);
local_irq_save(flags);
if (mm == current->mm)
ptep = find_current_mm_pte(mm->pgd, addr, NULL, NULL);
else
ptep = find_init_mm_pte(addr, NULL);
- local_irq_restore(flags);
+
if (!ptep || pte_special(*ptep))
- return ULONG_MAX;
- return pte_pfn(*ptep);
+ pfn = ULONG_MAX;
+ else
+ pfn = pte_pfn(*ptep);
+
+ local_irq_restore(flags);
+ end_lockless_pgtbl_walk(mm);
+ return pfn;
}
/* flush SLBs and reload */
Applies the counting-based method for monitoring lockless pgtable walks on addr_to_pfn(). Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com> --- arch/powerpc/kernel/mce_power.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)