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 <rmcl...@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.le...@csgroup.eu> > --- > 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_FLAGS > diff --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's > diff --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