The quilt patch titled
Subject: mm/arm: redefine pmd_huge() with pmd_leaf()
has been removed from the -mm tree. Its filename was
mm-arm-redefine-pmd_huge-with-pmd_leaf.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Peter Xu <peterx@xxxxxxxxxx>
Subject: mm/arm: redefine pmd_huge() with pmd_leaf()
Date: Mon, 18 Mar 2024 16:03:57 -0400
Most of the archs already define these two APIs the same way. ARM is more
complicated in two aspects:
- For pXd_huge() it's always checking against !PXD_TABLE_BIT, while for
pXd_leaf() it's always checking against PXD_TYPE_SECT.
- SECT/TABLE bits are defined differently on 2-level v.s. 3-level ARM
pgtables, which makes the whole thing even harder to follow.
Luckily, the second complexity should be hidden by the pmd_leaf()
implementation against 2-level v.s. 3-level headers. Invoke pmd_leaf()
directly for pmd_huge(), to remove the first part of complexity. This
prepares to drop pXd_huge() API globally.
When at it, drop the obsolete comments - it's outdated.
Link: https://lkml.kernel.org/r/20240318200404.448346-8-peterx@xxxxxxxxxx
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Cc: Bjorn Andersson <andersson@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Cc: Fabio Estevam <festevam@xxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Andreas Larsson <andreas@xxxxxxxxxxx>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Cc: Mark Salter <msalter@xxxxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Naoya Horiguchi <nao.horiguchi@xxxxxxxxx>
Cc: "Naveen N. Rao" <naveen.n.rao@xxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/mm/hugetlbpage.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
--- a/arch/arm/mm/hugetlbpage.c~mm-arm-redefine-pmd_huge-with-pmd_leaf
+++ a/arch/arm/mm/hugetlbpage.c
@@ -18,11 +18,6 @@
#include <asm/tlb.h>
#include <asm/tlbflush.h>
-/*
- * On ARM, huge pages are backed by pmd's rather than pte's, so we do a lot
- * of type casting from pmd_t * to pte_t *.
- */
-
int pud_huge(pud_t pud)
{
return 0;
@@ -30,5 +25,5 @@ int pud_huge(pud_t pud)
int pmd_huge(pmd_t pmd)
{
- return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
+ return pmd_leaf(pmd);
}
_
Patches currently in -mm which might be from peterx@xxxxxxxxxx are
mm-userfaultfd-reset-ptes-when-close-for-wr-protected-ones.patch
mm-hugetlb-assert-hugetlb_lock-in-__hugetlb_cgroup_commit_charge.patch
mm-page_table_check-support-userfault-wr-protect-entries.patch
