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Date: 6 Jun 2013 22:21:42 -0400
From: "George Spelvin" <linux@...izon.com>
To: peterz@...radead.org
Cc: linux@...izon.com, linux-kernel@...r.kernel.org
Subject: Re: TLB and PTE coherency during munmap
It's a bug in the original code, but as long as you're cleaning it up:
@@ -103,6 +97,7 @@ extern struct ia64_tr_entry *ia64_idtrs[NR_CPUS];
static inline void
ia64_tlb_flush_mmu (struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
+ unsigned long i;
unsigned int nr;
if (!tlb->need_flush)
@@ -141,13 +136,11 @@ ia64_tlb_flush_mmu (struct mmu_gather *tlb, unsigned long start, unsigned long e
/* lastly, release the freed pages */
nr = tlb->nr;
- if (!tlb_fast_mode(tlb)) {
- unsigned long i;
- tlb->nr = 0;
- tlb->start_addr = ~0UL;
- for (i = 0; i < nr; ++i)
- free_page_and_swap_cache(tlb->pages[i]);
- }
+
+ tlb->nr = 0;
+ tlb->start_addr = ~0UL;
+ for (i = 0; i < nr; ++i)
+ free_page_and_swap_cache(tlb->pages[i]);
}
How about making that first hunk:
@@ -103,6 +97,6 @@ extern struct ia64_tr_entry *ia64_idtrs[NR_CPUS];
static inline void
ia64_tlb_flush_mmu (struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
- unsigned int nr;
+ unsigned int nr, i;
if (!tlb->need_flush)
Because i does not need to be 64 bits; tlb->nr is only 32.
--
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