From: Andrew Morton <akpm@linux-foundation.org>
To: ziy@nvidia.com, will@kernel.org, weixugc@google.com,
songmuchun@bytedance.com, rppt@kernel.org, rientjes@google.com,
pjt@google.com, mingo@redhat.com, jirislaby@kernel.org,
hughd@google.com, hpa@zytor.com, gthelen@google.com,
dave.hansen@linux.intel.com, anshuman.khandual@arm.com,
aneesh.kumar@linux.ibm.com, pasha.tatashin@soleen.com,
akpm@linux-foundation.org, linux-mm@kvack.org,
mm-commits@vger.kernel.org, torvalds@linux-foundation.org,
akpm@linux-foundation.org
Subject: [patch 03/10] mm/page_table_check: use unsigned long for page counters and cleanup
Date: Fri, 04 Feb 2022 09:56:48 -0800 [thread overview]
Message-ID: <20220204175648.DABF7C004E1@smtp.kernel.org> (raw)
In-Reply-To: <20220203204836.88dcebe504f440686cc63a60@linux-foundation.org>
From: Pasha Tatashin <pasha.tatashin@soleen.com>
Subject: mm/page_table_check: use unsigned long for page counters and cleanup
For consistency, use "unsigned long" for all page counters.
Also, reduce code duplication by calling
__page_table_check_*_clear() from __page_table_check_*_set() functions.
Link: https://lkml.kernel.org/r/20220131203249.2832273-3-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Wei Xu <weixugc@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Paul Turner <pjt@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/page_table_check.c | 35 +++++++----------------------------
1 file changed, 7 insertions(+), 28 deletions(-)
--- a/mm/page_table_check.c~mm-page_table_check-use-unsigned-long-for-page-counters-and-cleanup
+++ a/mm/page_table_check.c
@@ -86,8 +86,8 @@ static void page_table_check_clear(struc
{
struct page_ext *page_ext;
struct page *page;
+ unsigned long i;
bool anon;
- int i;
if (!pfn_valid(pfn))
return;
@@ -121,8 +121,8 @@ static void page_table_check_set(struct
{
struct page_ext *page_ext;
struct page *page;
+ unsigned long i;
bool anon;
- int i;
if (!pfn_valid(pfn))
return;
@@ -152,10 +152,10 @@ static void page_table_check_set(struct
void __page_table_check_zero(struct page *page, unsigned int order)
{
struct page_ext *page_ext = lookup_page_ext(page);
- int i;
+ unsigned long i;
BUG_ON(!page_ext);
- for (i = 0; i < (1 << order); i++) {
+ for (i = 0; i < (1ul << order); i++) {
struct page_table_check *ptc = get_page_table_check(page_ext);
BUG_ON(atomic_read(&ptc->anon_map_count));
@@ -206,17 +206,10 @@ EXPORT_SYMBOL(__page_table_check_pud_cle
void __page_table_check_pte_set(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
- pte_t old_pte;
-
if (&init_mm == mm)
return;
- old_pte = *ptep;
- if (pte_user_accessible_page(old_pte)) {
- page_table_check_clear(mm, addr, pte_pfn(old_pte),
- PAGE_SIZE >> PAGE_SHIFT);
- }
-
+ __page_table_check_pte_clear(mm, addr, *ptep);
if (pte_user_accessible_page(pte)) {
page_table_check_set(mm, addr, pte_pfn(pte),
PAGE_SIZE >> PAGE_SHIFT,
@@ -228,17 +221,10 @@ EXPORT_SYMBOL(__page_table_check_pte_set
void __page_table_check_pmd_set(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd)
{
- pmd_t old_pmd;
-
if (&init_mm == mm)
return;
- old_pmd = *pmdp;
- if (pmd_user_accessible_page(old_pmd)) {
- page_table_check_clear(mm, addr, pmd_pfn(old_pmd),
- PMD_PAGE_SIZE >> PAGE_SHIFT);
- }
-
+ __page_table_check_pmd_clear(mm, addr, *pmdp);
if (pmd_user_accessible_page(pmd)) {
page_table_check_set(mm, addr, pmd_pfn(pmd),
PMD_PAGE_SIZE >> PAGE_SHIFT,
@@ -250,17 +236,10 @@ EXPORT_SYMBOL(__page_table_check_pmd_set
void __page_table_check_pud_set(struct mm_struct *mm, unsigned long addr,
pud_t *pudp, pud_t pud)
{
- pud_t old_pud;
-
if (&init_mm == mm)
return;
- old_pud = *pudp;
- if (pud_user_accessible_page(old_pud)) {
- page_table_check_clear(mm, addr, pud_pfn(old_pud),
- PUD_PAGE_SIZE >> PAGE_SHIFT);
- }
-
+ __page_table_check_pud_clear(mm, addr, *pudp);
if (pud_user_accessible_page(pud)) {
page_table_check_set(mm, addr, pud_pfn(pud),
PUD_PAGE_SIZE >> PAGE_SHIFT,
_
next prev parent reply other threads:[~2022-02-04 17:56 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-04 4:48 incoming Andrew Morton
2022-02-04 4:49 ` [patch 01/10] Revert "mm/page_isolation: unset migratetype directly for non Buddy page" Andrew Morton
2022-02-04 4:49 ` [patch 02/10] mm/debug_vm_pgtable: remove pte entry from the page table Andrew Morton
2022-02-04 4:49 ` [patch 03/10] mm/page_table_check: use unsigned long for page counters and cleanup Andrew Morton
2022-02-04 4:49 ` [patch 04/10] mm/khugepaged: unify collapse pmd clear, flush and free Andrew Morton
2022-02-04 4:49 ` [patch 05/10] mm/page_table_check: check entries at pmd levels Andrew Morton
2022-02-04 4:49 ` [patch 06/10] mm/pgtable: define pte_index so that preprocessor could recognize it Andrew Morton
2022-02-04 4:49 ` [patch 07/10] ipc/sem: do not sleep with a spin lock held Andrew Morton
2022-02-04 4:49 ` [patch 08/10] mm/kmemleak: avoid scanning potential huge holes Andrew Morton
2022-02-04 4:49 ` [patch 09/10] MAINTAINERS: update rppt's email Andrew Morton
2022-02-04 4:49 ` [patch 10/10] kselftest/vm: revert "tools/testing/selftests/vm/userfaultfd.c: use swap() to make code cleaner" Andrew Morton
2022-02-04 17:56 ` [patch 01/10] Revert "mm/page_isolation: unset migratetype directly for non Buddy page" Andrew Morton
2022-02-04 17:56 ` [patch 02/10] mm/debug_vm_pgtable: remove pte entry from the page table Andrew Morton
2022-02-04 17:56 ` Andrew Morton [this message]
2022-02-04 17:56 ` [patch 04/10] mm/khugepaged: unify collapse pmd clear, flush and free Andrew Morton
2022-02-04 17:56 ` [patch 05/10] mm/page_table_check: check entries at pmd levels Andrew Morton
2022-02-04 17:57 ` [patch 06/10] mm/pgtable: define pte_index so that preprocessor could recognize it Andrew Morton
2022-02-04 17:57 ` [patch 07/10] ipc/sem: do not sleep with a spin lock held Andrew Morton
2022-02-04 17:57 ` [patch 08/10] mm/kmemleak: avoid scanning potential huge holes Andrew Morton
2022-02-04 17:57 ` [patch 09/10] MAINTAINERS: update rppt's email Andrew Morton
2022-02-04 17:57 ` [patch 10/10] kselftest/vm: revert "tools/testing/selftests/vm/userfaultfd.c: use swap() to make code cleaner" Andrew Morton
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