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Commit 38e3cbd9 authored by Anton Ivanov's avatar Anton Ivanov Committed by Richard Weinberger
Browse files

um: Skip TLB flushing where not needed 



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

Signed-off-by: default avatarAnton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent a9c52c2a

arch/um/kernel/tlb.c

+14 −7
Original line number Diff line number Diff line
@@ -520,6 +520,13 @@ pte_t *addr_pte(struct task_struct *task, unsigned long addr) 


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);

}
@@ -541,6 +548,13 @@ void __flush_tlb_one(unsigned long addr) 
static void fix_range(struct mm_struct *mm, unsigned long start_addr,

		      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);

}
@@ -556,13 +570,6 @@ EXPORT_SYMBOL(flush_tlb_range); 
void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,

			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);

}