linux-kernel - [PATCH v2 04/17] arm64: Refactor pud

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 27 Mar 2018 14:15:14 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, cdall@...nel.org, marc.zyngier@....com,
        punit.agrawal@....com, will.deacon@....com,
        catalin.marinas@....com, pbonzini@...hat.com, rkrcmar@...hat.com,
        ard.biesheuvel@...aro.org, peter.maydell@...aro.org,
        kristina.martsenko@....com, mark.rutland@....com,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Steve Capper <steve.capper@....com>
Subject: [PATCH v2 04/17] arm64: Refactor pud_huge for reusability

Make pud_huge reusable for stage2 tables, independent
of the stage1 levels.

Cc: Steve Capper <steve.capper@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Christoffer Dall <cdall@...nel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 arch/arm64/include/asm/pgtable.h | 5 +++++
 arch/arm64/mm/hugetlbpage.c      | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 5e22503..4a16c11 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -479,6 +479,11 @@ static inline phys_addr_t pmd_page_paddr(pmd_t pmd)
 #define __raw_pud_bad(pud)	(!(pud_val(pud) & PUD_TABLE_BIT))
 #define __raw_pud_present(pud)	pte_present(pud_pte(pud))
 
+static inline int __raw_pud_huge(pud_t pud)
+{
+	return pud_val(pud) && !(pud_val(pud) & PUD_TABLE_BIT);
+}
+
 static inline void __raw_set_pud(pud_t *pudp, pud_t pud)
 {
 	WRITE_ONCE(*pudp, pud);
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index ecc6818..3f4bb43 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -35,7 +35,7 @@ int pmd_huge(pmd_t pmd)
 int pud_huge(pud_t pud)
 {
 #ifndef __PAGETABLE_PMD_FOLDED
-	return pud_val(pud) && !(pud_val(pud) & PUD_TABLE_BIT);
+	return __raw_pud_huge(pud);
 #else
 	return 0;
 #endif
-- 
2.7.4