+ mm-gup-merge-pxd-huge-mapping-checks.patch added to mm-unstable branch

+ mm-gup-merge-pxd-huge-mapping-checks.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/gup: merge pXd huge mapping checks
has been added to the -mm mm-unstable branch.  Its filename is
     mm-gup-merge-pxd-huge-mapping-checks.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-gup-merge-pxd-huge-mapping-checks.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Peter Xu <peterx@redhat.com>
Subject: mm/gup: merge pXd huge mapping checks
Date: Mon, 18 Mar 2024 16:04:00 -0400

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.

Link: https://lkml.kernel.org/r/20240318200404.448346-11-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bjorn Andersson <andersson@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Mark Salter <msalter@redhat.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/gup.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/mm/gup.c~mm-gup-merge-pxd-huge-mapping-checks
+++ a/mm/gup.c
@@ -3015,8 +3015,7 @@ static int gup_pmd_range(pud_t *pudp, pu
 		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;
@@ -3053,7 +3052,7 @@ static int gup_pud_range(p4d_t *p4dp, p4
 		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;
@@ -3106,7 +3105,7 @@ static void gup_pgd_range(unsigned long
 		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;
_

Patches currently in -mm which might be from peterx@redhat.com are

mm-memory-fix-missing-pte-marker-for-page-on-pte-zaps.patch
mm-hmm-process-pud-swap-entry-without-pud_huge.patch
mm-gup-cache-p4d-in-follow_p4d_mask.patch
mm-gup-check-p4d-presence-before-going-on.patch
mm-x86-change-pxd_huge-behavior-to-exclude-swap-entries.patch
mm-sparc-change-pxd_huge-behavior-to-exclude-swap-entries.patch
mm-arm-use-macros-to-define-pmd-pud-helpers.patch
mm-arm-redefine-pmd_huge-with-pmd_leaf.patch
mm-arm64-merge-pxd_huge-and-pxd_leaf-definitions.patch
mm-powerpc-redefine-pxd_huge-with-pxd_leaf.patch
mm-gup-merge-pxd-huge-mapping-checks.patch
mm-treewide-replace-pxd_huge-with-pxd_leaf.patch
mm-treewide-remove-pxd_huge.patch
mm-arm-remove-pmd_thp_or_huge.patch
mm-document-pxd_leaf-api.patch