The patch titled
Subject: parisc: mm: ensure pagetable_pmd_[cd]tor are called
has been added to the -mm mm-unstable branch. Its filename is
parisc-mm-ensure-pagetable_pmd_tor-are-called.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/parisc-mm-ensure-pagetable_pmd_tor-are-called.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: Kevin Brodsky <kevin.brodsky@xxxxxxx>
Subject: parisc: mm: ensure pagetable_pmd_[cd]tor are called
Date: Fri, 3 Jan 2025 18:44:11 +0000
The implementation of pmd_{alloc_one,free} on parisc requires a non-zero
allocation order, but is completely standard aside from that. Let's reuse
the generic implementation of pmd_alloc_one(). Explicit zeroing is not
needed as GFP_PGTABLE_KERNEL includes __GFP_ZERO. The generic pmd_free()
can handle higher allocation orders so we don't need to define our own.
These changes ensure that pagetable_pmd_[cd]tor are called, improving the
accounting of page table pages.
Link: https://lkml.kernel.org/r/20250103184415.2744423-3-kevin.brodsky@xxxxxxx
Signed-off-by: Kevin Brodsky <kevin.brodsky@xxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/parisc/include/asm/pgalloc.h | 23 ++++++++++++-----------
1 file changed, 12 insertions(+), 11 deletions(-)
--- a/arch/parisc/include/asm/pgalloc.h~parisc-mm-ensure-pagetable_pmd_tor-are-called
+++ a/arch/parisc/include/asm/pgalloc.h
@@ -11,7 +11,6 @@
#include <asm/cache.h>
#define __HAVE_ARCH_PMD_ALLOC_ONE
-#define __HAVE_ARCH_PMD_FREE
#define __HAVE_ARCH_PGD_FREE
#include <asm-generic/pgalloc.h>
@@ -46,17 +45,19 @@ static inline void pud_populate(struct m
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
{
- pmd_t *pmd;
+ struct ptdesc *ptdesc;
+ gfp_t gfp = GFP_PGTABLE_USER;
- pmd = (pmd_t *)__get_free_pages(GFP_PGTABLE_KERNEL, PMD_TABLE_ORDER);
- if (likely(pmd))
- memset ((void *)pmd, 0, PAGE_SIZE << PMD_TABLE_ORDER);
- return pmd;
-}
-
-static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
-{
- free_pages((unsigned long)pmd, PMD_TABLE_ORDER);
+ if (mm == &init_mm)
+ gfp = GFP_PGTABLE_KERNEL;
+ ptdesc = pagetable_alloc(gfp, PMD_TABLE_ORDER);
+ if (!ptdesc)
+ return NULL;
+ if (!pagetable_pmd_ctor(ptdesc)) {
+ pagetable_free(ptdesc);
+ return NULL;
+ }
+ return ptdesc_address(ptdesc);
}
#endif
_
Patches currently in -mm which might be from kevin.brodsky@xxxxxxx are
selftests-mm-fix-condition-in-uffd_move_test_common.patch
selftests-mm-fix-wmaybe-uninitialized-warnings.patch
selftests-mm-fix-strncpy-length.patch
selftests-mm-fix-warray-bounds-warnings-in-pkey_sighandler_tests.patch
selftests-mm-fix-warray-bounds-warnings-in-pkey_sighandler_tests-fix.patch
selftests-mm-build-with-o2.patch
selftests-mm-remove-unused-pkey-helpers.patch
selftests-mm-define-types-using-typedef-in-pkey-helpersh.patch
selftests-mm-ensure-pkey-h-define-inline-functions-only.patch
selftests-mm-remove-empty-pkey-helper-definition.patch
selftests-mm-ensure-non-global-pkey-symbols-are-marked-static.patch
selftests-mm-use-sys_pkey-helpers-consistently.patch
selftests-mm-use-sys_pkey-helpers-consistently-fix.patch
selftests-mm-rename-pkey-register-macro.patch
selftests-mm-skip-pkey_sighandler_tests-if-support-is-missing.patch
selftests-mm-remove-x-permission-from-sigaltstack-mapping.patch
riscv-mm-skip-pgtable-level-check-in-pudp4d_alloc_one.patch
asm-generic-pgalloc-provide-generic-p4d_alloc_onefree.patch
mm-move-common-part-of-pagetable__ctor-to-helper.patch
parisc-mm-ensure-pagetable_pmd_tor-are-called.patch
m68k-mm-add-calls-to-pagetable_pmd_tor.patch
arm-mm-rename-pgd-helpers.patch
asm-generic-pgalloc-provide-generic-__pgd_allocfree.patch
mm-introduce-ctor-dtor-at-pgd-level.patch
