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um: Skip TLB flushing where not needed

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Skip TLB flushing for all cases where it is not needed, not
just flush_tlb_mm_range

Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Anton Ivanov 2018-12-05 12:37:40 +00:00 committed by Richard Weinberger
parent a9c52c2a28
commit 38e3cbd9b8
1 changed files with 14 additions and 7 deletions
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21
arch/um/kernel/tlb.c
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@ -520,6 +520,13 @@ pte_t *addr_pte(struct task_struct *task, unsigned long addr)
void flush_tlb_all(void) void flush_tlb_all(void)
{ {
/*
* Don't bother flushing if this address space is about to be
* destroyed.
*/
if (atomic_read(&current->mm->mm_users) == 0)
return;
flush_tlb_mm(current->mm); flush_tlb_mm(current->mm);
} }
@ -541,6 +548,13 @@ void __flush_tlb_one(unsigned long addr)
static void fix_range(struct mm_struct *mm, unsigned long start_addr, static void fix_range(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force) unsigned long end_addr, int force)
{ {
/*
* Don't bother flushing if this address space is about to be
* destroyed.
*/
if (atomic_read(&mm->mm_users) == 0)
return;
fix_range_common(mm, start_addr, end_addr, force); fix_range_common(mm, start_addr, end_addr, force);
} }
@ -556,13 +570,6 @@ EXPORT_SYMBOL(flush_tlb_range);
void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long end) unsigned long end)
{ {
/*
* Don't bother flushing if this address space is about to be
* destroyed.
*/
if (atomic_read(&mm->mm_users) == 0)
return;
fix_range(mm, start, end, 0); fix_range(mm, start, end, 0);
} }