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mm: Rename pmd_read_atomic()

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There's no point in having the identical routines for PTE/PMD have
different names.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20221022114424.841277397%40infradead.org
This commit is contained in:
Peter Zijlstra 2020-11-26 17:20:28 +01:00 committed by Dave Hansen
parent 6ca297d478
commit dab6e71742
7 changed files with 9 additions and 14 deletions
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9
include/linux/pgtable.h
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@ -1352,11 +1352,6 @@ static inline int pud_trans_unstable(pud_t *pud)
#endif
}
static inline pmd_t pmd_read_atomic(pmd_t *pmdp)
{
return pmdp_get_lockless(pmdp);
}
#ifndef arch_needs_pgtable_deposit
#define arch_needs_pgtable_deposit() (false)
#endif
@ -1383,13 +1378,13 @@ static inline pmd_t pmd_read_atomic(pmd_t *pmdp)
*/
static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd)
{
pmd_t pmdval = pmd_read_atomic(pmd);
pmd_t pmdval = pmdp_get_lockless(pmd);
/*
* The barrier will stabilize the pmdval in a register or on
* the stack so that it will stop changing under the code.
*
* When CONFIG_TRANSPARENT_HUGEPAGE=y on x86 32bit PAE,
* pmd_read_atomic is allowed to return a not atomic pmdval
* pmdp_get_lockless is allowed to return a not atomic pmdval
* (for example pointing to an hugepage that has never been
* mapped in the pmd). The below checks will only care about
* the low part of the pmd with 32bit PAE x86 anyway, with the

2
mm/hmm.c
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@ -361,7 +361,7 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
* huge or device mapping one and compute corresponding pfn
* values.
*/
pmd = pmd_read_atomic(pmdp);
pmd = pmdp_get_lockless(pmdp);
barrier();
if (!pmd_devmap(pmd) && !pmd_trans_huge(pmd))
goto again;

2
mm/khugepaged.c
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@ -862,7 +862,7 @@ static int find_pmd_or_thp_or_none(struct mm_struct *mm,
if (!*pmd)
return SCAN_PMD_NULL;
pmde = pmd_read_atomic(*pmd);
pmde = pmdp_get_lockless(*pmd);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/* See comments in pmd_none_or_trans_huge_or_clear_bad() */

2
mm/mapping_dirty_helpers.c
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@ -126,7 +126,7 @@ static int clean_record_pte(pte_t *pte, unsigned long addr,
static int wp_clean_pmd_entry(pmd_t *pmd, unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
pmd_t pmdval = pmd_read_atomic(pmd);
pmd_t pmdval = pmdp_get_lockless(pmd);
if (!pmd_trans_unstable(&pmdval))
return 0;

2
mm/mprotect.c
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@ -294,7 +294,7 @@ static unsigned long change_pte_range(struct mmu_gather *tlb,
*/
static inline int pmd_none_or_clear_bad_unless_trans_huge(pmd_t *pmd)
{
pmd_t pmdval = pmd_read_atomic(pmd);
pmd_t pmdval = pmdp_get_lockless(pmd);
/* See pmd_none_or_trans_huge_or_clear_bad for info on barrier */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE

2
mm/userfaultfd.c
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@ -630,7 +630,7 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm,
break;
}
dst_pmdval = pmd_read_atomic(dst_pmd);
dst_pmdval = pmdp_get_lockless(dst_pmd);
/*
* If the dst_pmd is mapped as THP don't
* override it and just be strict.

4
mm/vmscan.c
View File

@ -4039,9 +4039,9 @@ static void walk_pmd_range(pud_t *pud, unsigned long start, unsigned long end,
/* walk_pte_range() may call get_next_vma() */
vma = args->vma;
for (i = pmd_index(start), addr = start; addr != end; i++, addr = next) {
pmd_t val = pmd_read_atomic(pmd + i);
pmd_t val = pmdp_get_lockless(pmd + i);
/* for pmd_read_atomic() */
/* for pmdp_get_lockless() */
barrier();
next = pmd_addr_end(addr, end);