linux-kernel - [PATCH] mm: folio_zero_user: (fixup) cache neighbouring pages

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Message-Id: <20260108004346.1652207-1-ankur.a.arora@oracle.com>
Date: Wed,  7 Jan 2026 16:43:46 -0800
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, david@...nel.org, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
        mjguzik@...il.com, luto@...nel.org, peterz@...radead.org,
        tglx@...utronix.de, willy@...radead.org, raghavendra.kt@....com,
        chleroy@...nel.org, ioworker0@...il.com, lizhe.67@...edance.com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        ankur.a.arora@...cle.com
Subject: [PATCH] mm: folio_zero_user: (fixup) cache neighbouring pages

Constify the unit computation. Also, cleans up the comment
a little bit.

Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
 mm/memory.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 11ad1db61929..95dc21ca120f 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -7240,19 +7240,19 @@ static inline int process_huge_page(
 static void clear_contig_highpages(struct page *page, unsigned long addr,
 				   unsigned int nr_pages)
 {
-	unsigned int i, unit, count;
-
-	might_sleep();
+	unsigned int i, count;
 	/*
-	 * When clearing we want to operate on the largest extent possible since
-	 * that allows for extent based architecture specific optimizations.
+	 * When clearing we want to operate on the largest extent possible to
+	 * allow for for architecture specific extent based optimizations.
 	 *
-	 * However, since the clearing interfaces (clear_user_highpages(),
-	 * clear_user_pages(), clear_pages()), do not call cond_resched(), we
-	 * limit the batch size when running under non-preemptible scheduling
-	 * models.
+	 * However, since clear_user_highpages() (and primitives clear_user_pages(),
+	 * clear_pages()), do not call cond_resched(), limit the unit size when
+	 * running under non-preemptible scheduling models.
 	 */
-	unit = preempt_model_preemptible() ? nr_pages : PROCESS_PAGES_NON_PREEMPT_BATCH;
+	const unsigned int unit = preempt_model_preemptible() ?
+				   nr_pages : PROCESS_PAGES_NON_PREEMPT_BATCH;
+
+	might_sleep();
 
 	for (i = 0; i < nr_pages; i += count) {
 		cond_resched();
-- 
2.31.1