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mm: cleanup *pte_alloc* interfaces 

There are few things about *pte_alloc*() helpers worth cleaning up:

 - 'vma' argument is unused, let's drop it;

 - most __pte_alloc() callers do speculative check for pmd_none(),
   before taking ptl: let's introduce pte_alloc() macro which does
   the check.

   The only direct user of __pte_alloc left is userfaultfd, which has
   different expectation about atomicity wrt pmd.

 - pte_alloc_map() and pte_alloc_map_lock() are redefined using
   pte_alloc().

[sudeep.holla@arm.com: fix build for arm64 hugetlbpage]
[sfr@canb.auug.org.au: fix arch/arm/mm/mmu.c some more]
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2016-03-17 14:19:11 -07:00 committed by Linus Torvalds
parent 5057dcd0f1
commit 3ed3a4f0dd
16 changed files with 27 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm/mm/mmu.c
View File

@ -732,7 +732,7 @@ static void *__init late_alloc(unsigned long sz)
return ptr;
}
static pte_t * __init pte_alloc(pmd_t *pmd, unsigned long addr,
static pte_t * __init arm_pte_alloc(pmd_t *pmd, unsigned long addr,
unsigned long prot,
void *(*alloc)(unsigned long sz))
{
@ -747,7 +747,7 @@ static pte_t * __init pte_alloc(pmd_t *pmd, unsigned long addr,
static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr,
unsigned long prot)
{
return pte_alloc(pmd, addr, prot, early_alloc);
return arm_pte_alloc(pmd, addr, prot, early_alloc);
}
static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
@ -756,7 +756,7 @@ static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
void *(*alloc)(unsigned long sz),
bool ng)
{
pte_t *pte = pte_alloc(pmd, addr, type->prot_l1, alloc);
pte_t *pte = arm_pte_alloc(pmd, addr, type->prot_l1, alloc);
do {
set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)),
ng ? PTE_EXT_NG : 0);

2
arch/arm/mm/pgd.c
View File

@ -80,7 +80,7 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
if (!new_pmd)
goto no_pmd;
new_pte = pte_alloc_map(mm, NULL, new_pmd, 0);
new_pte = pte_alloc_map(mm, new_pmd, 0);
if (!new_pte)
goto no_pte;

2
arch/arm64/mm/hugetlbpage.c
View File

@ -124,7 +124,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
* will be no pte_unmap() to correspond with this
* pte_alloc_map().
*/
pte = pte_alloc_map(mm, NULL, pmd, addr);
pte = pte_alloc_map(mm, pmd, addr);
} else if (sz == PMD_SIZE) {
if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
pud_none(*pud))

2
arch/ia64/mm/hugetlbpage.c
View File

@ -38,7 +38,7 @@ huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz)
if (pud) {
pmd = pmd_alloc(mm, pud, taddr);
if (pmd)
pte = pte_alloc_map(mm, NULL, pmd, taddr);
pte = pte_alloc_map(mm, pmd, taddr);
}
return pte;
}

2
arch/metag/mm/hugetlbpage.c
View File

@ -67,7 +67,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
pgd = pgd_offset(mm, addr);
pud = pud_offset(pgd, addr);
pmd = pmd_offset(pud, addr);
pte = pte_alloc_map(mm, NULL, pmd, addr);
pte = pte_alloc_map(mm, pmd, addr);
pgd->pgd &= ~_PAGE_SZ_MASK;
pgd->pgd |= _PAGE_SZHUGE;

2
arch/parisc/mm/hugetlbpage.c
View File

@ -63,7 +63,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
if (pud) {
pmd = pmd_alloc(mm, pud, addr);
if (pmd)
pte = pte_alloc_map(mm, NULL, pmd, addr);
pte = pte_alloc_map(mm, pmd, addr);
}
return pte;
}

2
arch/sh/mm/hugetlbpage.c
View File

@ -35,7 +35,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
if (pud) {
pmd = pmd_alloc(mm, pud, addr);
if (pmd)
pte = pte_alloc_map(mm, NULL, pmd, addr);
pte = pte_alloc_map(mm, pmd, addr);
}
}

2
arch/sparc/mm/hugetlbpage.c
View File

@ -146,7 +146,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
if (pud) {
pmd = pmd_alloc(mm, pud, addr);
if (pmd)
pte = pte_alloc_map(mm, NULL, pmd, addr);
pte = pte_alloc_map(mm, pmd, addr);
}
return pte;
}

2
arch/tile/mm/hugetlbpage.c
View File

@ -77,7 +77,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
else {
if (sz != PAGE_SIZE << huge_shift[HUGE_SHIFT_PAGE])
panic("Unexpected page size %#lx\n", sz);
return pte_alloc_map(mm, NULL, pmd, addr);
return pte_alloc_map(mm, pmd, addr);
}
}
#else

2
arch/um/kernel/skas/mmu.c
View File

@ -31,7 +31,7 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
if (!pmd)
goto out_pmd;
pte = pte_alloc_map(mm, NULL, pmd, proc);
pte = pte_alloc_map(mm, pmd, proc);
if (!pte)
goto out_pte;

2
arch/unicore32/mm/pgd.c
View File

@ -54,7 +54,7 @@ pgd_t *get_pgd_slow(struct mm_struct *mm)
if (!new_pmd)
goto no_pmd;
new_pte = pte_alloc_map(mm, NULL, new_pmd, 0);
new_pte = pte_alloc_map(mm, new_pmd, 0);
if (!new_pte)
goto no_pte;

2
arch/x86/kernel/tboot.c
View File

@ -135,7 +135,7 @@ static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
pmd = pmd_alloc(&tboot_mm, pud, vaddr);
if (!pmd)
return -1;
pte = pte_alloc_map(&tboot_mm, NULL, pmd, vaddr);
pte = pte_alloc_map(&tboot_mm, pmd, vaddr);
if (!pte)
return -1;
set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));

17
include/linux/mm.h
View File

@ -1545,8 +1545,7 @@ static inline void mm_dec_nr_pmds(struct mm_struct *mm)
}
#endif
int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
pmd_t *pmd, unsigned long address);
int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
/*
@ -1672,15 +1671,15 @@ static inline void pgtable_page_dtor(struct page *page)
pte_unmap(pte); \
} while (0)
#define pte_alloc_map(mm, vma, pmd, address) \
((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
pmd, address))? \
NULL: pte_offset_map(pmd, address))
#define pte_alloc(mm, pmd, address) \
(unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd, address))
#define pte_alloc_map(mm, pmd, address) \
(pte_alloc(mm, pmd, address) ? NULL : pte_offset_map(pmd, address))
#define pte_alloc_map_lock(mm, pmd, address, ptlp) \
((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
pmd, address))? \
NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
(pte_alloc(mm, pmd, address) ? \
NULL : pte_offset_map_lock(mm, pmd, address, ptlp))
#define pte_alloc_kernel(pmd, address) \
((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \

8
mm/memory.c
View File

@ -562,8 +562,7 @@ void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *vma,
}
}
int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
pmd_t *pmd, unsigned long address)
int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address)
{
spinlock_t *ptl;
pgtable_t new = pte_alloc_one(mm, address);
@ -3419,12 +3418,11 @@ static int __handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
}
/*
* Use __pte_alloc instead of pte_alloc_map, because we can't
* Use pte_alloc() instead of pte_alloc_map, because we can't
* run pte_offset_map on the pmd, if an huge pmd could
* materialize from under us from a different thread.
*/
if (unlikely(pmd_none(*pmd)) &&
unlikely(__pte_alloc(mm, vma, pmd, address)))
if (unlikely(pte_alloc(mm, pmd, address)))
return VM_FAULT_OOM;
/*
* If a huge pmd materialized under us just retry later. Use

3
mm/mremap.c
View File

@ -213,8 +213,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
continue;
VM_BUG_ON(pmd_trans_huge(*old_pmd));
}
if (pmd_none(*new_pmd) && __pte_alloc(new_vma->vm_mm, new_vma,
new_pmd, new_addr))
if (pte_alloc(new_vma->vm_mm, new_pmd, new_addr))
break;
next = (new_addr + PMD_SIZE) & PMD_MASK;
if (extent > next - new_addr)

3
mm/userfaultfd.c
View File

@ -230,8 +230,7 @@ retry:
break;
}
if (unlikely(pmd_none(dst_pmdval)) &&
unlikely(__pte_alloc(dst_mm, dst_vma, dst_pmd,
dst_addr))) {
unlikely(__pte_alloc(dst_mm, dst_pmd, dst_addr))) {
err = -ENOMEM;
break;
}