[PATCH RFC 1/3] riscv: pgtable.h: Fixup _PAGE_CHG_MASK usage
From: guoren@kernel.org
Date: 2021-05-19 05:05:38
Also in:
linux-riscv, linux-sunxi, lkml
Subsystem:
risc-v architecture, the rest · Maintainers:
Paul Walmsley, Palmer Dabbelt, Albert Ou, Linus Torvalds
From: Guo Ren <redacted> '& _PAGE_CHG_MASK' should masks all attributes BITS then '>> _PAGE_PFN_SHIFT' get the final correct PFN value. '& _PAGE_CHG_MASK' makes the code semantics more accurate. Signed-off-by: Guo Ren <redacted> Cc: Anup Patel <redacted> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Drew Fustini <redacted> Cc: Palmer Dabbelt <redacted> Cc: Wei Fu <wefu@redhat.com> Cc: Wei Wu <redacted> --- arch/riscv/include/asm/pgtable-64.h | 8 +++++--- arch/riscv/include/asm/pgtable.h | 6 +++--- 2 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index f3b0da6..cbf9acf 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h@@ -62,12 +62,14 @@ static inline void pud_clear(pud_t *pudp) static inline unsigned long pud_page_vaddr(pud_t pud) { - return (unsigned long)pfn_to_virt(pud_val(pud) >> _PAGE_PFN_SHIFT); + return (unsigned long)pfn_to_virt( + (pud_val(pud) & _PAGE_CHG_MASK) >> _PAGE_PFN_SHIFT); } static inline struct page *pud_page(pud_t pud) { - return pfn_to_page(pud_val(pud) >> _PAGE_PFN_SHIFT); + return pfn_to_page( + (pud_val(pud) & _PAGE_CHG_MASK) >> _PAGE_PFN_SHIFT); } static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
@@ -77,7 +79,7 @@ static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot) static inline unsigned long _pmd_pfn(pmd_t pmd) { - return pmd_val(pmd) >> _PAGE_PFN_SHIFT; + return (pmd_val(pmd) & _PAGE_CHG_MASK) >> _PAGE_PFN_SHIFT; } #define pmd_ERROR(e) \
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 9469f46..869d6bf 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h@@ -216,12 +216,12 @@ static inline unsigned long _pgd_pfn(pgd_t pgd) static inline struct page *pmd_page(pmd_t pmd) { - return pfn_to_page(pmd_val(pmd) >> _PAGE_PFN_SHIFT); + return pfn_to_page((pmd_val(pmd) & _PAGE_CHG_MASK) >> _PAGE_PFN_SHIFT); } static inline unsigned long pmd_page_vaddr(pmd_t pmd) { - return (unsigned long)pfn_to_virt(pmd_val(pmd) >> _PAGE_PFN_SHIFT); + return (unsigned long)pfn_to_virt((pmd_val(pmd) & _PAGE_CHG_MASK) >> _PAGE_PFN_SHIFT); } static inline pte_t pmd_pte(pmd_t pmd)
@@ -232,7 +232,7 @@ static inline pte_t pmd_pte(pmd_t pmd) /* Yields the page frame number (PFN) of a page table entry */ static inline unsigned long pte_pfn(pte_t pte) { - return (pte_val(pte) >> _PAGE_PFN_SHIFT); + return ((pte_val(pte) & _PAGE_CHG_MASK) >> _PAGE_PFN_SHIFT); } #define pte_page(x) pfn_to_page(pte_pfn(x))
--
2.7.4