From: Steven Price <steven.price@arm.com> To: linux-mm@kvack.org Cc: "Steven Price" <steven.price@arm.com>, "Andy Lutomirski" <luto@kernel.org>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Arnd Bergmann" <arnd@arndb.de>, "Borislav Petkov" <bp@alien8.de>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Ingo Molnar" <mingo@redhat.com>, "James Morse" <james.morse@arm.com>, "Jérôme Glisse" <jglisse@redhat.com>, "Peter Zijlstra" <peterz@infradead.org>, "Thomas Gleixner" <tglx@linutronix.de>, "Will Deacon" <will.deacon@arm.com>, x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, "Mark Rutland" <Mark.Rutland@arm.com>, "Liang, Kan" <kan.liang@linux.intel.com> Subject: [PATCH v6 11/19] mm: pagewalk: Allow walking without vma Date: Tue, 26 Mar 2019 16:26:16 +0000 [thread overview] Message-ID: <20190326162624.20736-12-steven.price@arm.com> (raw) In-Reply-To: <20190326162624.20736-1-steven.price@arm.com> Since 48684a65b4e3: "mm: pagewalk: fix misbehavior of walk_page_range for vma(VM_PFNMAP)", page_table_walk() will report any kernel area as a hole, because it lacks a vma. This means each arch has re-implemented page table walking when needed, for example in the per-arch ptdump walker. Remove the requirement to have a vma except when trying to split huge pages. Signed-off-by: Steven Price <steven.price@arm.com> --- mm/pagewalk.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 98373a9f88b8..dac0c848b458 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -36,7 +36,7 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, do { again: next = pmd_addr_end(addr, end); - if (pmd_none(*pmd) || !walk->vma) { + if (pmd_none(*pmd)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, walk); if (err) @@ -59,9 +59,14 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, if (!walk->pte_entry) continue; - split_huge_pmd(walk->vma, pmd, addr); - if (pmd_trans_unstable(pmd)) - goto again; + if (walk->vma) { + split_huge_pmd(walk->vma, pmd, addr); + if (pmd_trans_unstable(pmd)) + goto again; + } else if (pmd_large(*pmd)) { + continue; + } + err = walk_pte_range(pmd, addr, next, walk); if (err) break; @@ -81,7 +86,7 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end, do { again: next = pud_addr_end(addr, end); - if (pud_none(*pud) || !walk->vma) { + if (pud_none(*pud)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, walk); if (err) @@ -95,9 +100,13 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end, break; } - split_huge_pud(walk->vma, pud, addr); - if (pud_none(*pud)) - goto again; + if (walk->vma) { + split_huge_pud(walk->vma, pud, addr); + if (pud_none(*pud)) + goto again; + } else if (pud_large(*pud)) { + continue; + } if (walk->pmd_entry || walk->pte_entry) err = walk_pmd_range(pud, addr, next, walk); -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Steven Price <steven.price@arm.com> To: linux-mm@kvack.org Cc: "Mark Rutland" <Mark.Rutland@arm.com>, x86@kernel.org, "Arnd Bergmann" <arnd@arndb.de>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Peter Zijlstra" <peterz@infradead.org>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Will Deacon" <will.deacon@arm.com>, linux-kernel@vger.kernel.org, "Steven Price" <steven.price@arm.com>, "Jérôme Glisse" <jglisse@redhat.com>, "Ingo Molnar" <mingo@redhat.com>, "Borislav Petkov" <bp@alien8.de>, "Andy Lutomirski" <luto@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, "James Morse" <james.morse@arm.com>, "Thomas Gleixner" <tglx@linutronix.de>, linux-arm-kernel@lists.infradead.org, "Liang, Kan" <kan.liang@linux.intel.com> Subject: [PATCH v6 11/19] mm: pagewalk: Allow walking without vma Date: Tue, 26 Mar 2019 16:26:16 +0000 [thread overview] Message-ID: <20190326162624.20736-12-steven.price@arm.com> (raw) In-Reply-To: <20190326162624.20736-1-steven.price@arm.com> Since 48684a65b4e3: "mm: pagewalk: fix misbehavior of walk_page_range for vma(VM_PFNMAP)", page_table_walk() will report any kernel area as a hole, because it lacks a vma. This means each arch has re-implemented page table walking when needed, for example in the per-arch ptdump walker. Remove the requirement to have a vma except when trying to split huge pages. Signed-off-by: Steven Price <steven.price@arm.com> --- mm/pagewalk.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 98373a9f88b8..dac0c848b458 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -36,7 +36,7 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, do { again: next = pmd_addr_end(addr, end); - if (pmd_none(*pmd) || !walk->vma) { + if (pmd_none(*pmd)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, walk); if (err) @@ -59,9 +59,14 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, if (!walk->pte_entry) continue; - split_huge_pmd(walk->vma, pmd, addr); - if (pmd_trans_unstable(pmd)) - goto again; + if (walk->vma) { + split_huge_pmd(walk->vma, pmd, addr); + if (pmd_trans_unstable(pmd)) + goto again; + } else if (pmd_large(*pmd)) { + continue; + } + err = walk_pte_range(pmd, addr, next, walk); if (err) break; @@ -81,7 +86,7 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end, do { again: next = pud_addr_end(addr, end); - if (pud_none(*pud) || !walk->vma) { + if (pud_none(*pud)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, walk); if (err) @@ -95,9 +100,13 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end, break; } - split_huge_pud(walk->vma, pud, addr); - if (pud_none(*pud)) - goto again; + if (walk->vma) { + split_huge_pud(walk->vma, pud, addr); + if (pud_none(*pud)) + goto again; + } else if (pud_large(*pud)) { + continue; + } if (walk->pmd_entry || walk->pte_entry) err = walk_pmd_range(pud, addr, next, walk); -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-03-26 16:27 UTC|newest] Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-03-26 16:26 [PATCH v6 00/19] Convert x86 & arm64 to use generic page walk Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 01/19] arc: mm: Add p?d_large() definitions Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 02/19] arm64: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 03/19] mips: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 04/19] powerpc: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:58 ` Christophe Leroy 2019-03-26 16:58 ` Christophe Leroy 2019-03-26 16:58 ` Christophe Leroy 2019-03-26 16:58 ` Christophe Leroy 2019-03-28 11:00 ` Steven Price 2019-03-28 11:00 ` Steven Price 2019-03-28 11:00 ` Steven Price 2019-03-28 11:00 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 05/19] riscv: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 06/19] s390: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 07/19] sparc: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 08/19] x86: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 09/19] mm: Add generic p?d_large() macros Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 10/19] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price [this message] 2019-03-26 16:26 ` [PATCH v6 11/19] mm: pagewalk: Allow walking without vma Steven Price 2019-03-26 16:26 ` [PATCH v6 12/19] mm: pagewalk: Add test_p?d callbacks Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 13/19] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 14/19] x86: mm: Don't display pages which aren't present in debugfs Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 15/19] x86: mm: Point to struct seq_file from struct pg_state Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 16/19] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 17/19] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 18/19] x86: mm: Convert ptdump_walk_pgd_level_core() " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 19/19] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price 2019-03-26 16:26 ` Steven Price
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