| Message ID | 1556810922-20248-6-git-send-email-rppt@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | introduce generic pte_{alloc,free}_one[_kernel] | expand |
Hi Mike, Acked-by: Guo Ren <ren_guo@c-sky.com> On Thu, May 02, 2019 at 06:28:32PM +0300, Mike Rapoport wrote: > The csky implementation pte_alloc_one(), pte_free_kernel() and pte_free() > is identical to the generic except of lack of __GFP_ACCOUNT for the user > PTEs allocation. > > Switch csky to use generic version of these functions. Ok. > > The csky implementation of pte_alloc_one_kernel() is not replaced because > it does not clear the allocated page but rather sets each PTE in it to a > non-zero value. Yes, we must set each PTE to _PAGE_GLOBAL because hardware refill the MMU TLB entry with two PTEs and it use the result of pte0.global | pte1.global. If pte0 is valid and pte1 is invalid, we must set _PAGE_GLOBAL in invalid pte entry. Fortunately, there is no performance issue. > > The pte_free_kernel() and pte_free() versions on csky are identical to the > generic ones and can be simply dropped. Ok. Best Regards Guo Ren > > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> > --- > arch/csky/include/asm/pgalloc.h | 30 +++--------------------------- > 1 file changed, 3 insertions(+), 27 deletions(-) > > diff --git a/arch/csky/include/asm/pgalloc.h b/arch/csky/include/asm/pgalloc.h > index d213bb4..98c571670 100644 > --- a/arch/csky/include/asm/pgalloc.h > +++ b/arch/csky/include/asm/pgalloc.h > @@ -8,6 +8,9 @@ > #include <linux/mm.h> > #include <linux/sched.h> > > +#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL > +#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */ > + > static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, > pte_t *pte) > { > @@ -39,33 +42,6 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) > return pte; > } > > -static inline struct page *pte_alloc_one(struct mm_struct *mm) > -{ > - struct page *pte; > - > - pte = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0); > - if (!pte) > - return NULL; > - > - if (!pgtable_page_ctor(pte)) { > - __free_page(pte); > - return NULL; > - } > - > - return pte; > -} > - > -static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) > -{ > - free_pages((unsigned long)pte, PTE_ORDER); > -} > - > -static inline void pte_free(struct mm_struct *mm, pgtable_t pte) > -{ > - pgtable_page_dtor(pte); > - __free_pages(pte, PTE_ORDER); > -} > - > static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) > { > free_pages((unsigned long)pgd, PGD_ORDER); > -- > 2.7.4 >
On Sat, May 04, 2019 at 12:03:48AM +0800, Guo Ren wrote: > Hi Mike, > > Acked-by: Guo Ren <ren_guo@c-sky.com> > > On Thu, May 02, 2019 at 06:28:32PM +0300, Mike Rapoport wrote: > > The csky implementation pte_alloc_one(), pte_free_kernel() and pte_free() > > is identical to the generic except of lack of __GFP_ACCOUNT for the user > > PTEs allocation. > > > > Switch csky to use generic version of these functions. > Ok. > > > > > The csky implementation of pte_alloc_one_kernel() is not replaced because > > it does not clear the allocated page but rather sets each PTE in it to a > > non-zero value. > Yes, we must set each PTE to _PAGE_GLOBAL because hardware refill the > MMU TLB entry with two PTEs and it use the result of pte0.global | pte1.global. ^^^^^^^^^^^^^^^^^^^^^^^^^ correct: pte0.global & pte1.global > If pte0 is valid and pte1 is invalid, we must set _PAGE_GLOBAL in > invalid pte entry. Fortunately, there is no performance issue. > > > > > The pte_free_kernel() and pte_free() versions on csky are identical to the > > generic ones and can be simply dropped. > Ok. > > Best Regards > Guo Ren > > > > > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> > > --- > > arch/csky/include/asm/pgalloc.h | 30 +++--------------------------- > > 1 file changed, 3 insertions(+), 27 deletions(-) > > > > diff --git a/arch/csky/include/asm/pgalloc.h b/arch/csky/include/asm/pgalloc.h > > index d213bb4..98c571670 100644 > > --- a/arch/csky/include/asm/pgalloc.h > > +++ b/arch/csky/include/asm/pgalloc.h > > @@ -8,6 +8,9 @@ > > #include <linux/mm.h> > > #include <linux/sched.h> > > > > +#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL > > +#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */ > > + > > static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, > > pte_t *pte) > > { > > @@ -39,33 +42,6 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) > > return pte; > > } > > > > -static inline struct page *pte_alloc_one(struct mm_struct *mm) > > -{ > > - struct page *pte; > > - > > - pte = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0); > > - if (!pte) > > - return NULL; > > - > > - if (!pgtable_page_ctor(pte)) { > > - __free_page(pte); > > - return NULL; > > - } > > - > > - return pte; > > -} > > - > > -static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) > > -{ > > - free_pages((unsigned long)pte, PTE_ORDER); > > -} > > - > > -static inline void pte_free(struct mm_struct *mm, pgtable_t pte) > > -{ > > - pgtable_page_dtor(pte); > > - __free_pages(pte, PTE_ORDER); > > -} > > - > > static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) > > { > > free_pages((unsigned long)pgd, PGD_ORDER); > > -- > > 2.7.4 > > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv
diff --git a/arch/csky/include/asm/pgalloc.h b/arch/csky/include/asm/pgalloc.h index d213bb4..98c571670 100644 --- a/arch/csky/include/asm/pgalloc.h +++ b/arch/csky/include/asm/pgalloc.h @@ -8,6 +8,9 @@ #include <linux/mm.h> #include <linux/sched.h> +#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL +#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */ + static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) { @@ -39,33 +42,6 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) return pte; } -static inline struct page *pte_alloc_one(struct mm_struct *mm) -{ - struct page *pte; - - pte = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0); - if (!pte) - return NULL; - - if (!pgtable_page_ctor(pte)) { - __free_page(pte); - return NULL; - } - - return pte; -} - -static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) -{ - free_pages((unsigned long)pte, PTE_ORDER); -} - -static inline void pte_free(struct mm_struct *mm, pgtable_t pte) -{ - pgtable_page_dtor(pte); - __free_pages(pte, PTE_ORDER); -} - static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) { free_pages((unsigned long)pgd, PGD_ORDER);
The csky implementation pte_alloc_one(), pte_free_kernel() and pte_free() is identical to the generic except of lack of __GFP_ACCOUNT for the user PTEs allocation. Switch csky to use generic version of these functions. The csky implementation of pte_alloc_one_kernel() is not replaced because it does not clear the allocated page but rather sets each PTE in it to a non-zero value. The pte_free_kernel() and pte_free() versions on csky are identical to the generic ones and can be simply dropped. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> --- arch/csky/include/asm/pgalloc.h | 30 +++--------------------------- 1 file changed, 3 insertions(+), 27 deletions(-)