On Thu, 2 May 2019 06:46:23 -0700 Matthew Wilcox willy@infradead.org wrote:
On Thu, May 02, 2019 at 06:48:46PM +0530, Anshuman Khandual wrote:
Drop the pgtable_t variable from all implementation for pte_fn_t as none of them use it. apply_to_pte_range() should stop computing it as well. Should help us save some cycles.
You didn't add Martin Schwidefsky for some reason. He introduced it originally for s390 for sub-page page tables back in 2008 (commit 2f569afd9c). I think he should confirm that he no longer needs it.
With its 2K pte tables s390 can not deal with a (struct page *) as a reference to a page table. But if there are no user of the apply_to_page_range() API left which actually make use of the token argument we can safely drop it.
- Boot tested on arm64 and x86 platforms.
- Build tested on multiple platforms with their defconfig
arch/arm/kernel/efi.c | 3 +-- arch/arm/mm/dma-mapping.c | 3 +-- arch/arm/mm/pageattr.c | 3 +-- arch/arm64/kernel/efi.c | 3 +-- arch/arm64/mm/pageattr.c | 3 +-- arch/x86/xen/mmu_pv.c | 3 +-- drivers/gpu/drm/i915/i915_mm.c | 3 +-- drivers/xen/gntdev.c | 6 ++---- drivers/xen/privcmd.c | 6 ++---- drivers/xen/xlate_mmu.c | 3 +-- include/linux/mm.h | 3 +-- mm/memory.c | 5 +---- mm/vmalloc.c | 2 +- 13 files changed, 15 insertions(+), 31 deletions(-)
diff --git a/arch/arm/kernel/efi.c b/arch/arm/kernel/efi.c index 9f43ba012d10..b1f142a01f2f 100644 --- a/arch/arm/kernel/efi.c +++ b/arch/arm/kernel/efi.c @@ -11,8 +11,7 @@ #include <asm/mach/map.h> #include <asm/mmu_context.h>
-static int __init set_permissions(pte_t *ptep, pgtable_t token,
unsigned long addr, void *data)+static int __init set_permissions(pte_t *ptep, unsigned long addr, void *data) { efi_memory_desc_t *md = data; pte_t pte = *ptep; diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 43f46aa7ef33..739286511a18 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -496,8 +496,7 @@ void __init dma_contiguous_remap(void) } }
-static int __dma_update_pte(pte_t *pte, pgtable_t token, unsigned long addr,
void *data)+static int __dma_update_pte(pte_t *pte, unsigned long addr, void *data) { struct page *page = virt_to_page(addr); pgprot_t prot = *(pgprot_t *)data; diff --git a/arch/arm/mm/pageattr.c b/arch/arm/mm/pageattr.c index 1403cb4a0c3d..c8b500940e1f 100644 --- a/arch/arm/mm/pageattr.c +++ b/arch/arm/mm/pageattr.c @@ -22,8 +22,7 @@ struct page_change_data { pgprot_t clear_mask; };
-static int change_page_range(pte_t *ptep, pgtable_t token, unsigned long addr,
void *data)+static int change_page_range(pte_t *ptep, unsigned long addr, void *data) { struct page_change_data *cdata = data; pte_t pte = *ptep; diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c index 4f9acb5fbe97..230cff073a08 100644 --- a/arch/arm64/kernel/efi.c +++ b/arch/arm64/kernel/efi.c @@ -86,8 +86,7 @@ int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md) return 0; }
-static int __init set_permissions(pte_t *ptep, pgtable_t token,
unsigned long addr, void *data)+static int __init set_permissions(pte_t *ptep, unsigned long addr, void *data) { efi_memory_desc_t *md = data; pte_t pte = READ_ONCE(*ptep); diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index 6cd645edcf35..0be077628b21 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -27,8 +27,7 @@ struct page_change_data {
bool rodata_full __ro_after_init = IS_ENABLED(CONFIG_RODATA_FULL_DEFAULT_ENABLED);
-static int change_page_range(pte_t *ptep, pgtable_t token, unsigned long addr,
void *data)+static int change_page_range(pte_t *ptep, unsigned long addr, void *data) { struct page_change_data *cdata = data; pte_t pte = READ_ONCE(*ptep); diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c index a21e1734fc1f..308a6195fd26 100644 --- a/arch/x86/xen/mmu_pv.c +++ b/arch/x86/xen/mmu_pv.c @@ -2702,8 +2702,7 @@ struct remap_data { struct mmu_update *mmu_update; };
-static int remap_area_pfn_pte_fn(pte_t *ptep, pgtable_t token,
unsigned long addr, void *data)+static int remap_area_pfn_pte_fn(pte_t *ptep, unsigned long addr, void *data) { struct remap_data *rmd = data; pte_t pte = pte_mkspecial(mfn_pte(*rmd->pfn, rmd->prot)); diff --git a/drivers/gpu/drm/i915/i915_mm.c b/drivers/gpu/drm/i915/i915_mm.c index e4935dd1fd37..c23bb29e6d3e 100644 --- a/drivers/gpu/drm/i915/i915_mm.c +++ b/drivers/gpu/drm/i915/i915_mm.c @@ -35,8 +35,7 @@ struct remap_pfn { pgprot_t prot; };
-static int remap_pfn(pte_t *pte, pgtable_t token,
unsigned long addr, void *data)+static int remap_pfn(pte_t *pte, unsigned long addr, void *data) { struct remap_pfn *r = data;
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 7cf9c51318aa..f0df481e2697 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -264,8 +264,7 @@ void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map)
/* ------------------------------------------------------------------ */
-static int find_grant_ptes(pte_t *pte, pgtable_t token,
unsigned long addr, void *data)+static int find_grant_ptes(pte_t *pte, unsigned long addr, void *data) { struct gntdev_grant_map *map = data; unsigned int pgnr = (addr - map->vma->vm_start) >> PAGE_SHIFT; @@ -292,8 +291,7 @@ static int find_grant_ptes(pte_t *pte, pgtable_t token, }
#ifdef CONFIG_X86 -static int set_grant_ptes_as_special(pte_t *pte, pgtable_t token,
unsigned long addr, void *data)+static int set_grant_ptes_as_special(pte_t *pte, unsigned long addr, void *data) { set_pte_at(current->mm, addr, pte, pte_mkspecial(*pte)); return 0; diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c index b24ddac1604b..4c7268869e2c 100644 --- a/drivers/xen/privcmd.c +++ b/drivers/xen/privcmd.c @@ -730,8 +730,7 @@ struct remap_pfn { unsigned long i; };
-static int remap_pfn_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
void *data)+static int remap_pfn_fn(pte_t *ptep, unsigned long addr, void *data) { struct remap_pfn *r = data; struct page *page = r->pages[r->i]; @@ -965,8 +964,7 @@ static int privcmd_mmap(struct file *file, struct vm_area_struct *vma)
- on a per pfn/pte basis. Mapping calls that fail with ENOENT
- can be then retried until success.
*/ -static int is_mapped_fn(pte_t *pte, struct page *pmd_page,
unsigned long addr, void *data)+static int is_mapped_fn(pte_t *pte, unsigned long addr, void *data) { return pte_none(*pte) ? 0 : -EBUSY; } diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c index e7df65d32c91..ba883a80b3c0 100644 --- a/drivers/xen/xlate_mmu.c +++ b/drivers/xen/xlate_mmu.c @@ -93,8 +93,7 @@ static void setup_hparams(unsigned long gfn, void *data) info->fgfn++; }
-static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
void *data)+static int remap_pte_fn(pte_t *ptep, unsigned long addr, void *data) { struct remap_data *info = data; struct page *page = info->pages[info->index++]; diff --git a/include/linux/mm.h b/include/linux/mm.h index 6b10c21630f5..f9509d57edc6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2595,8 +2595,7 @@ static inline int vm_fault_to_errno(vm_fault_t vm_fault, int foll_flags) return 0; }
-typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
void *data);+typedef int (*pte_fn_t)(pte_t *pte, unsigned long addr, void *data); extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, unsigned long size, pte_fn_t fn, void *data);
diff --git a/mm/memory.c b/mm/memory.c index ab650c21bccd..dd0e64c94ddc 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1952,7 +1952,6 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd, { pte_t *pte; int err;
pgtable_t token; spinlock_t *uninitialized_var(ptl);
pte = (mm == &init_mm) ?
@@ -1965,10 +1964,8 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
arch_enter_lazy_mmu_mode();
- token = pmd_pgtable(*pmd);
- do {
err = fn(pte++, token, addr, data);
err = fn(pte++, addr, data);diff --git a/mm/vmalloc.c b/mm/vmalloc.c index e86ba6e74b50..94533beb6b68 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2332,7 +2332,7 @@ void __weak vmalloc_sync_all(void) }
-static int f(pte_t *pte, pgtable_t table, unsigned long addr, void *data) +static int f(pte_t *pte, unsigned long addr, void *data) { pte_t ***p = data;
-- 2.20.1