linux-kernel - [RFC PATCH 04/16] mm/madvise: remove len parameter of madvise_do

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Message-Id: <20250305181611.54484-5-sj@kernel.org>
Date: Wed,  5 Mar 2025 10:15:59 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	"Liam R. Howlett" <howlett@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Vlastimil Babka <vbabka@...e.cz>,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH 04/16] mm/madvise: remove len parameter of madvise_do_behavior()

Because madise_should_skip() logic is factored out, making
madvise_do_behavior() calculates 'len' on its own rather then receiving
it as a parameter makes code simpler.  Remove the parameter.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/madvise.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index 265b325d8829..c5e1a4d1df72 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1666,7 +1666,7 @@ static bool is_memory_populate(int behavior)
 }
 
 static int madvise_do_behavior(struct mm_struct *mm,
-		unsigned long start, size_t len_in, size_t len, int behavior)
+		unsigned long start, size_t len_in, int behavior)
 {
 	struct blk_plug plug;
 	unsigned long end;
@@ -1675,7 +1675,7 @@ static int madvise_do_behavior(struct mm_struct *mm,
 	if (is_memory_failure(behavior))
 		return madvise_inject_error(behavior, start, start + len_in);
 	start = untagged_addr_remote(mm, start);
-	end = start + len;
+	end = start + PAGE_ALIGN(len_in);
 
 	blk_start_plug(&plug);
 	if (is_memory_populate(behavior))
@@ -1768,8 +1768,7 @@ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int beh
 	error = madvise_lock(mm, behavior);
 	if (error)
 		return error;
-	error = madvise_do_behavior(mm, start, len_in, PAGE_ALIGN(len_in),
-			behavior);
+	error = madvise_do_behavior(mm, start, len_in, behavior);
 	madvise_unlock(mm, behavior);
 
 	return error;
@@ -1801,8 +1800,7 @@ static ssize_t vector_madvise(struct mm_struct *mm, struct iov_iter *iter,
 		if (madvise_should_skip(start, len_in, behavior, &error))
 			ret = error;
 		else
-			ret = madvise_do_behavior(mm, start, len_in,
-					PAGE_ALIGN(len_in), behavior);
+			ret = madvise_do_behavior(mm, start, len_in, behavior);
 		/*
 		 * An madvise operation is attempting to restart the syscall,
 		 * but we cannot proceed as it would not be correct to repeat
-- 
2.39.5