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Commit 2a146533 authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

powerpc/mm: Avoid useless lock with single page fragments 



There is no point in taking the page table lock as pte_frag or
pmd_frag are always NULL when we have only one fragment.

Reviewed-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent a95d133c

arch/powerpc/mm/pgtable-book3s64.c

+3 −0
Original line number Diff line number Diff line
@@ -244,6 +244,9 @@ static pmd_t *get_pmd_from_cache(struct mm_struct *mm) 
{

	void *pmd_frag, *ret;



	if (PMD_FRAG_NR == 1)

		return NULL;



	spin_lock(&mm->page_table_lock);

	ret = mm->context.pmd_frag;

	if (ret) {

arch/powerpc/mm/pgtable-frag.c

+3 −0
Original line number Diff line number Diff line
@@ -34,6 +34,9 @@ static pte_t *get_pte_from_cache(struct mm_struct *mm) 
{

	void *pte_frag, *ret;



	if (PTE_FRAG_NR == 1)

		return NULL;



	spin_lock(&mm->page_table_lock);

	ret = mm->context.pte_frag;

	if (ret) {