linux-kernel - [PATCH v2 1/9] mm/clear_huge_page: allow arch override for clear_huge

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Message-Id: <20230830184958.2333078-2-ankur.a.arora@oracle.com>
Date:   Wed, 30 Aug 2023 11:49:50 -0700
From:   Ankur Arora <ankur.a.arora@...cle.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Cc:     akpm@...ux-foundation.org, luto@...nel.org, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        willy@...radead.org, mgorman@...e.de, peterz@...radead.org,
        rostedt@...dmis.org, tglx@...utronix.de, jon.grimm@....com,
        bharata@....com, raghavendra.kt@....com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        Ankur Arora <ankur.a.arora@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH v2 1/9] mm/clear_huge_page: allow arch override for clear_huge_page()

clear_huge_page() is constrained to process a page-at-a-time
because it also handles the CONFIG_HIGHMEM case.

Mark __weak to allow for arch specific optimizations.

Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
 mm/memory.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 405a483d2fd1..3854f0b9b3a9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5982,8 +5982,9 @@ static int clear_subpage(unsigned long addr, int idx, void *arg)
 	return 0;
 }
 
-void clear_huge_page(struct page *page,
-		     unsigned long addr_hint, unsigned int pages_per_huge_page)
+__weak void clear_huge_page(struct page *page,
+			    unsigned long addr_hint,
+			    unsigned int pages_per_huge_page)
 {
 	unsigned long addr = addr_hint &
 		~(((unsigned long)pages_per_huge_page << PAGE_SHIFT) - 1);
-- 
2.31.1