Commit 7ad9de6a authored by Thomas Gleixner's avatar Thomas Gleixner
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x86: CPA avoid repeated lazy mmu flush 



Impact: Flush the lazy MMU only once

Pending mmu updates only need to be flushed once to bring the
in-memory pagetable state up to date.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 34b0900d

arch/x86/mm/pageattr.c

+7 −8
Original line number Diff line number Diff line
@@ -575,14 +575,6 @@ static int __change_page_attr(struct cpa_data *cpa, int primary) 
		address = cpa->vaddr[cpa->curpage];

	else

		address = *cpa->vaddr;



	/*

	 * If we're called with lazy mmu updates enabled, the

	 * in-memory pte state may be stale.  Flush pending updates to

	 * bring them up to date.

	 */

	arch_flush_lazy_mmu_mode();



repeat:

	kpte = lookup_address(address, &level);

	if (!kpte)
@@ -819,6 +811,13 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages, 


	vm_unmap_aliases();



	/*

	 * If we're called with lazy mmu updates enabled, the

	 * in-memory pte state may be stale.  Flush pending updates to

	 * bring them up to date.

	 */

	arch_flush_lazy_mmu_mode();



	cpa.vaddr = addr;

	cpa.numpages = numpages;

	cpa.mask_set = mask_set;