Re: [PATCH v7 1/7] powerpc: mm: Separate set_pte, set_pte_at for internal, external use
From: Christophe Leroy <hidden>
Date: 2023-02-15 07:16:53
Le 15/02/2023 à 03:01, Rohan McLure a écrit :
Produce separate symbols for set_pte, which is to be used in arch/powerpc for reassignment of pte's, and set_pte_at, used in generic code. The reason for this distinction is to support the Page Table Check sanitiser. Having this distinction allows for set_pte_at to instrumented, but set_pte not to be, permitting for uninstrumented internal mappings. This distinction in names is also present in x86. Signed-off-by: Rohan McLure <redacted>
Reviewed-by: Christophe Leroy <redacted>
quoted hunk ↗ jump to hunk
--- v6: new patch v7: Remove extern, move set_pte args to be in a single line. --- arch/powerpc/include/asm/book3s/pgtable.h | 3 +-- arch/powerpc/include/asm/nohash/pgtable.h | 3 +-- arch/powerpc/include/asm/pgtable.h | 1 + arch/powerpc/mm/pgtable.c | 3 +-- 4 files changed, 4 insertions(+), 6 deletions(-)diff --git a/arch/powerpc/include/asm/book3s/pgtable.h b/arch/powerpc/include/asm/book3s/pgtable.h index d18b748ea3ae..1386ed705e66 100644 --- a/arch/powerpc/include/asm/book3s/pgtable.h +++ b/arch/powerpc/include/asm/book3s/pgtable.h@@ -12,8 +12,7 @@ /* Insert a PTE, top-level function is out of line. It uses an inline * low level function in the respective pgtable-* files */ -extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, - pte_t pte); +void set_pte(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte); #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGSdiff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h index 69c3a050a3d8..f36dd2e2d591 100644 --- a/arch/powerpc/include/asm/nohash/pgtable.h +++ b/arch/powerpc/include/asm/nohash/pgtable.h@@ -154,8 +154,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) /* Insert a PTE, top-level function is out of line. It uses an inline * low level function in the respective pgtable-* files */ -extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, - pte_t pte); +void set_pte(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte); /* This low level function performs the actual PTE insertion * Setting the PTE depends on the MMU type and other factors. It'sdiff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index 9972626ddaf6..17d30359d1f4 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h@@ -48,6 +48,7 @@ struct mm_struct; /* Keep these as a macros to avoid include dependency mess */ #define pte_page(x) pfn_to_page(pte_pfn(x)) #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) +#define set_pte_at set_pte /* * Select all bits except the pfn */diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c index cb2dcdb18f8e..d7cce317cef8 100644 --- a/arch/powerpc/mm/pgtable.c +++ b/arch/powerpc/mm/pgtable.c@@ -187,8 +187,7 @@ static pte_t set_access_flags_filter(pte_t pte, struct vm_area_struct *vma, /* * set_pte stores a linux PTE into the linux page table. */ -void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, - pte_t pte) +void set_pte(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte) { /* * Make sure hardware valid bit is not set. We don't do