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x86/mm/tlb: Revert the recent lazy TLB patches

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Revert commits:

  95b0e6357d x86/mm/tlb: Always use lazy TLB mode
  64482aafe5 x86/mm/tlb: Only send page table free TLB flush to lazy TLB CPUs
  ac03158969 x86/mm/tlb: Make lazy TLB mode lazier
  61d0beb579 x86/mm/tlb: Restructure switch_mm_irqs_off()
  2ff6ddf19c x86/mm/tlb: Leave lazy TLB mode at page table free time

In order to simplify the TLB invalidate fixes for x86 and unify the
parts that need backporting.  We'll try again later.

Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Peter Zijlstra 2018-08-22 17:30:13 +02:00 • committed by Linus Torvalds
commit 52a288c736
4 changed files with 77 additions and 181 deletions
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22
mm/memory.c
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@ -326,20 +326,16 @@ bool __tlb_remove_page_size(struct mmu_gather *tlb, struct page *page, int page_
#ifdef CONFIG_HAVE_RCU_TABLE_FREE
/*
* See the comment near struct mmu_table_batch.
*/
static void tlb_remove_table_smp_sync(void *arg)
{
struct mm_struct __maybe_unused *mm = arg;
/*
* On most architectures this does nothing. Simply delivering the
* interrupt is enough to prevent races with software page table
* walking like that done in get_user_pages_fast.
*
* See the comment near struct mmu_table_batch.
*/
tlb_flush_remove_tables_local(mm);
/* Simply deliver the interrupt */
}
static void tlb_remove_table_one(void *table, struct mmu_gather *tlb)
static void tlb_remove_table_one(void *table)
{
/*
* This isn't an RCU grace period and hence the page-tables cannot be
@ -348,7 +344,7 @@ static void tlb_remove_table_one(void *table, struct mmu_gather *tlb)
* It is however sufficient for software page-table walkers that rely on
* IRQ disabling. See the comment near struct mmu_table_batch.
*/
smp_call_function(tlb_remove_table_smp_sync, tlb->mm, 1);
smp_call_function(tlb_remove_table_smp_sync, NULL, 1);
__tlb_remove_table(table);
}
@ -369,8 +365,6 @@ void tlb_table_flush(struct mmu_gather *tlb)
{
struct mmu_table_batch **batch = &tlb->batch;
tlb_flush_remove_tables(tlb->mm);
if (*batch) {
call_rcu_sched(&(*batch)->rcu, tlb_remove_table_rcu);
*batch = NULL;
@ -393,7 +387,7 @@ void tlb_remove_table(struct mmu_gather *tlb, void *table)
if (*batch == NULL) {
*batch = (struct mmu_table_batch *)__get_free_page(GFP_NOWAIT | __GFP_NOWARN);
if (*batch == NULL) {
tlb_remove_table_one(table, tlb);
tlb_remove_table_one(table);
return;
}
(*batch)->nr = 0;