Commit 2686d514 authored by Qi Zheng's avatar Qi Zheng Committed by Andrew Morton
Browse files

mm: make zap_pte_range() handle full within-PMD range 

In preparation for reclaiming empty PTE pages, this commit first makes
zap_pte_range() to handle the full within-PMD range, so that we can more
easily detect and free PTE pages in this function in subsequent commits.

Link: https://lkml.kernel.org/r/76c95ee641da7808cd66d642ab95841df4048295.1733305182.git.zhengqi.arch@bytedance.com


Signed-off-by: default avatarQi Zheng <zhengqi.arch@bytedance.com>
Reviewed-by: default avatarJann Horn <jannh@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Zach O'Keefe <zokeefe@google.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 4059971c

mm/memory.c

+8 −0
Original line number Diff line number Diff line
@@ -1718,6 +1718,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, 
	pte_t *pte;

	int nr;



retry:

	tlb_change_page_size(tlb, PAGE_SIZE);

	init_rss_vec(rss);

	start_pte = pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
@@ -1757,6 +1758,13 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, 
	if (force_flush)

		tlb_flush_mmu(tlb);



	if (addr != end) {

		cond_resched();

		force_flush = false;

		force_break = false;

		goto retry;

	}



	return addr;

}