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mm: cleanup *pte_alloc* interfaces

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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
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm/mm/mmu.c
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@@ -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);