linux-kernel - [PATCH RFC 10/13] mm/gup: Merge pXd huge mapping checks

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Message-ID: <20240306104147.193052-11-peterx@redhat.com>
Date: Wed,  6 Mar 2024 18:41:44 +0800
From: peterx@...hat.com
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: linuxppc-dev@...ts.ozlabs.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Muchun Song <muchun.song@...ux.dev>,
	Jason Gunthorpe <jgg@...dia.com>,
	peterx@...hat.com,
	Matthew Wilcox <willy@...radead.org>,
	Mike Rapoport <rppt@...nel.org>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	x86@...nel.org,
	sparclinux@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH RFC 10/13] mm/gup: Merge pXd huge mapping checks

From: Peter Xu <peterx@...hat.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.

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

diff --git a/mm/gup.c b/mm/gup.c
index f87a7d90f2ae..de7188d2af86 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