linux-kernel - [PATCH v6 33/38] mm: Use flush_icache_pages() in do_set

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Message-Id: <20230802151406.3735276-34-willy@infradead.org>
Date:   Wed,  2 Aug 2023 16:14:01 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Anshuman Khandual <anshuman.khandual@....com>
Subject: [PATCH v6 33/38] mm: Use flush_icache_pages() in do_set_pmd()

Push the iteration over each page down to the architectures (many
can flush the entire THP without iteration).

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
---
 mm/memory.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 4e6e9ec7eaaf..e25edd4c24b8 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4400,7 +4400,6 @@ vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
 	bool write = vmf->flags & FAULT_FLAG_WRITE;
 	unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
 	pmd_t entry;
-	int i;
 	vm_fault_t ret = VM_FAULT_FALLBACK;
 
 	if (!transhuge_vma_suitable(vma, haddr))
@@ -4433,8 +4432,7 @@ vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
 	if (unlikely(!pmd_none(*vmf->pmd)))
 		goto out;
 
-	for (i = 0; i < HPAGE_PMD_NR; i++)
-		flush_icache_page(vma, page + i);
+	flush_icache_pages(vma, page, HPAGE_PMD_NR);
 
 	entry = mk_huge_pmd(page, vma->vm_page_prot);
 	if (write)
-- 
2.40.1