Commit eb780dca authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Dave Hansen
Browse files

mm: Remove pointless barrier() after pmdp_get_lockless() 



pmdp_get_lockless() should itself imply any ordering required.

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20221022114425.298833095%40infradead.org
parent d4a72e7f

mm/hmm.c

+0 −1
Original line number Diff line number Diff line
@@ -362,7 +362,6 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp, 
		 * values.

		 */

		pmd = pmdp_get_lockless(pmdp);

		barrier();

		if (!pmd_devmap(pmd) && !pmd_trans_huge(pmd))

			goto again;

mm/vmscan.c

+0 −3
Original line number Diff line number Diff line
@@ -4041,9 +4041,6 @@ static void walk_pmd_range(pud_t *pud, unsigned long start, unsigned long end, 
	for (i = pmd_index(start), addr = start; addr != end; i++, addr = next) {

		pmd_t val = pmdp_get_lockless(pmd + i);



		/* for pmdp_get_lockless() */

		barrier();



		next = pmd_addr_end(addr, end);



		if (!pmd_present(val) || is_huge_zero_pmd(val)) {