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From: peterx@redhat.com
To: linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	x86@kernel.org,
	Muchun Song <muchun.song@linux.dev>,
	Mike Rapoport <rppt@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	sparclinux@vger.kernel.org,
	Jason Gunthorpe <jgg@nvidia.com>,
	linuxppc-dev@lists.ozlabs.org,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	linux-arm-kernel@lists.infradead.org,
	peterx@redhat.com
Subject: [PATCH v2 10/14] mm/gup: Merge pXd huge mapping checks
Date: Mon, 18 Mar 2024 16:04:00 -0400
Message-ID: <20240318200404.448346-11-peterx@redhat.com>
In-Reply-To: <20240318200404.448346-1-peterx@redhat.com>
References: <20240318200404.448346-1-peterx@redhat.com>
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From: Peter Xu <peterx@redhat.com>

Huge mapping checks in GUP are slightly redundant and can be simplified.

pXd_huge() now is the same as pXd_leaf().  pmd_trans_huge() and
pXd_devmap() should both imply pXd_leaf(). Time to merge them into one.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 mm/gup.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index 802987281b2f..e2415e9789bc 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -3005,8 +3005,7 @@ static int gup_pmd_range(pud_t *pudp, pud_t pud, unsigned long addr, unsigned lo
 		if (!pmd_present(pmd))
 			return 0;
 
-		if (unlikely(pmd_trans_huge(pmd) || pmd_huge(pmd) ||
-			     pmd_devmap(pmd))) {
+		if (unlikely(pmd_leaf(pmd))) {
 			/* See gup_pte_range() */
 			if (pmd_protnone(pmd))
 				return 0;
@@ -3043,7 +3042,7 @@ static int gup_pud_range(p4d_t *p4dp, p4d_t p4d, unsigned long addr, unsigned lo
 		next = pud_addr_end(addr, end);
 		if (unlikely(!pud_present(pud)))
 			return 0;
-		if (unlikely(pud_huge(pud) || pud_devmap(pud))) {
+		if (unlikely(pud_leaf(pud))) {
 			if (!gup_huge_pud(pud, pudp, addr, next, flags,
 					  pages, nr))
 				return 0;
@@ -3096,7 +3095,7 @@ static void gup_pgd_range(unsigned long addr, unsigned long end,
 		next = pgd_addr_end(addr, end);
 		if (pgd_none(pgd))
 			return;
-		if (unlikely(pgd_huge(pgd))) {
+		if (unlikely(pgd_leaf(pgd))) {
 			if (!gup_huge_pgd(pgd, pgdp, addr, next, flags,
 					  pages, nr))
 				return;
-- 
2.44.0