linux-kernel - [RFC PATCH 15/16] mm/madvise: remove !tlb support from madvise_dontneed_single

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Message-Id: <20250305181611.54484-16-sj@kernel.org>
Date: Wed,  5 Mar 2025 10:16:10 -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 15/16] mm/madvise: remove !tlb support from madvise_dontneed_single_vma()

madvise_dontneed_single_vma() supports both batched tlb flushes and
unbatched tlb flushes use cases depending on received tlb parameter's
value.  Both were supported for safe and fine transition of the usages
from the unbatched flushed to the batched ones.  Now the transition is
done, and therefore there is no real unbatched tlb flushes use case.
Remove the code for supporting the no more being used input case.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/madvise.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index 0d292b8e1a0e..1dd2c25c83d8 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -866,10 +866,7 @@ static long madvise_dontneed_single_vma(struct mmu_gather *tlb,
 		.even_cows = true,
 	};
 
-	if (!tlb)
-		zap_page_range_single(vma, start, end - start, &details);
-	else
-		unmap_vma_single(tlb, vma, start, end - start, &details);
+	unmap_vma_single(tlb, vma, start, end - start, &details);
 	return 0;
 }
 
-- 
2.39.5