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[PATCH] mm: tlb_gather_mmu get_cpu_var

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tlb_gather_mmu dates from before kernel preemption was allowed, and uses
smp_processor_id or __get_cpu_var to find its per-cpu mmu_gather.  That works
because it's currently only called after getting page_table_lock, which is not
dropped until after the matching tlb_finish_mmu.  But don't rely on that, it
will soon change: now disable preemption internally by proper get_cpu_var in
tlb_gather_mmu, put_cpu_var in tlb_finish_mmu.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins
2005-10-29 18:16:01 -07:00
committed by Linus Torvalds
parent 7be7a54699
commit 15a23ffa2f
5 changed files with 19 additions and 13 deletions
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include/asm-generic/tlb.h
+5 -5
View File
@@ -35,9 +35,7 @@
#endif
/* struct mmu_gather is an opaque type used by the mm code for passing around
* any data needed by arch specific code for tlb_remove_page. This structure
* can be per-CPU or per-MM as the page table lock is held for the duration of
* TLB shootdown.
* any data needed by arch specific code for tlb_remove_page.
*/
struct mmu_gather {
struct mm_struct *mm;
@@ -57,7 +55,7 @@ DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
static inline struct mmu_gather *
tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
{
struct mmu_gather *tlb = &per_cpu(mmu_gathers, smp_processor_id());
struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
tlb->mm = mm;
@@ -85,7 +83,7 @@ tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
/* tlb_finish_mmu
* Called at the end of the shootdown operation to free up any resources
* that were required. The page table lock is still held at this point.
* that were required.
*/
static inline void
tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
@@ -101,6 +99,8 @@ tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
/* keep the page table cache within bounds */
check_pgt_cache();
put_cpu_var(mmu_gathers);
}
static inline unsigned int