linux-ext4 - [PATCH 08/12] mm/khugepaged: Remove redundant pmd

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Message-ID: <2093b864560884a2a525d951a7cc20007da6b9b6.1748500293.git-series.apopple@nvidia.com>
Date: Thu, 29 May 2025 16:32:09 +1000
From: Alistair Popple <apopple@...dia.com>
To: linux-mm@...ck.org
Cc: Alistair Popple <apopple@...dia.com>,
	gerald.schaefer@...ux.ibm.com,
	dan.j.williams@...el.com,
	jgg@...pe.ca,
	willy@...radead.org,
	david@...hat.com,
	linux-kernel@...r.kernel.org,
	nvdimm@...ts.linux.dev,
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	dri-devel@...ts.freedesktop.org,
	John@...ves.net
Subject: [PATCH 08/12] mm/khugepaged: Remove redundant pmd_devmap() check

The only users of pmd_devmap were device dax and fs dax. The check for
pmd_devmap() in check_pmd_state() is therefore redundant as callers
explicitly check for is_zone_device_page(), so this check can be dropped.

Signed-off-by: Alistair Popple <apopple@...dia.com>
---
 mm/khugepaged.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index cc945c6..7c2b9bc 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -958,8 +958,6 @@ static inline int check_pmd_state(pmd_t *pmd)
 		return SCAN_PMD_NULL;
 	if (pmd_trans_huge(pmde))
 		return SCAN_PMD_MAPPED;
-	if (pmd_devmap(pmde))
-		return SCAN_PMD_NULL;
 	if (pmd_bad(pmde))
 		return SCAN_PMD_NULL;
 	return SCAN_SUCCEED;
-- 
git-series 0.9.1