From: Muchun Song <songmuchun@bytedance.com>
To: mike.kravetz@oracle.com, akpm@linux-foundation.org,
osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com,
david@redhat.com, chenhuang5@huawei.com, bodeddub@amazon.com,
corbet@lwn.net
Cc: duanxiongchun@bytedance.com, fam.zheng@bytedance.com,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, zhengqi.arch@bytedance.com,
Muchun Song <songmuchun@bytedance.com>
Subject: [PATCH 1/5] mm: introduce PAGEFLAGS_MASK to replace ((1UL << NR_PAGEFLAGS) - 1)
Date: Wed, 14 Jul 2021 17:17:56 +0800 [thread overview]
Message-ID: <20210714091800.42645-2-songmuchun@bytedance.com> (raw)
In-Reply-To: <20210714091800.42645-1-songmuchun@bytedance.com>
Instead of hard-coding ((1UL << NR_PAGEFLAGS) - 1) everywhere, introducing
PAGEFLAGS_MASK to make the code clear to get the page flags.
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
include/linux/page-flags.h | 4 +++-
include/trace/events/page_ref.h | 4 ++--
lib/test_printf.c | 2 +-
lib/vsprintf.c | 2 +-
4 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 5922031ffab6..358d3f6fa976 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -178,6 +178,8 @@ enum pageflags {
PG_reported = PG_uptodate,
};
+#define PAGEFLAGS_MASK (~((1UL << NR_PAGEFLAGS) - 1))
+
#ifndef __GENERATING_BOUNDS_H
static inline unsigned long _compound_head(const struct page *page)
@@ -859,7 +861,7 @@ static inline void ClearPageSlabPfmemalloc(struct page *page)
* alloc-free cycle to prevent from reusing the page.
*/
#define PAGE_FLAGS_CHECK_AT_PREP \
- (((1UL << NR_PAGEFLAGS) - 1) & ~__PG_HWPOISON)
+ (~(PAGEFLAGS_MASK | __PG_HWPOISON))
#define PAGE_FLAGS_PRIVATE \
(1UL << PG_private | 1UL << PG_private_2)
diff --git a/include/trace/events/page_ref.h b/include/trace/events/page_ref.h
index 5d2ea93956ce..643b1b4e9f27 100644
--- a/include/trace/events/page_ref.h
+++ b/include/trace/events/page_ref.h
@@ -38,7 +38,7 @@ DECLARE_EVENT_CLASS(page_ref_mod_template,
TP_printk("pfn=0x%lx flags=%s count=%d mapcount=%d mapping=%p mt=%d val=%d",
__entry->pfn,
- show_page_flags(__entry->flags & ((1UL << NR_PAGEFLAGS) - 1)),
+ show_page_flags(__entry->flags & ~PAGEFLAGS_MASK),
__entry->count,
__entry->mapcount, __entry->mapping, __entry->mt,
__entry->val)
@@ -88,7 +88,7 @@ DECLARE_EVENT_CLASS(page_ref_mod_and_test_template,
TP_printk("pfn=0x%lx flags=%s count=%d mapcount=%d mapping=%p mt=%d val=%d ret=%d",
__entry->pfn,
- show_page_flags(__entry->flags & ((1UL << NR_PAGEFLAGS) - 1)),
+ show_page_flags(__entry->flags & ~PAGEFLAGS_MASK),
__entry->count,
__entry->mapcount, __entry->mapping, __entry->mt,
__entry->val, __entry->ret)
diff --git a/lib/test_printf.c b/lib/test_printf.c
index 8ac71aee46af..eadcc6458b10 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -614,7 +614,7 @@ page_flags_test(int section, int node, int zone, int last_cpupid,
bool append = false;
int i;
- flags &= BIT(NR_PAGEFLAGS) - 1;
+ flags &= ~PAGEFLAGS_MASK;
if (flags) {
page_flags |= flags;
snprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index dd006adfe853..ff7c180a2971 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -2019,7 +2019,7 @@ static const struct page_flags_fields pff[] = {
static
char *format_page_flags(char *buf, char *end, unsigned long flags)
{
- unsigned long main_flags = flags & (BIT(NR_PAGEFLAGS) - 1);
+ unsigned long main_flags = flags & ~PAGEFLAGS_MASK;
bool append = false;
int i;
--
2.11.0
next prev parent reply other threads:[~2021-07-14 9:21 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-14 9:17 [PATCH 0/5] Free the 2nd vmemmap page associated with each HugeTLB page Muchun Song
2021-07-14 9:17 ` Muchun Song [this message]
2021-07-26 21:04 ` [PATCH 1/5] mm: introduce PAGEFLAGS_MASK to replace ((1UL << NR_PAGEFLAGS) - 1) Mike Kravetz
2021-07-27 6:27 ` Muchun Song
2021-07-29 6:00 ` Muchun Song
2021-07-14 9:17 ` [PATCH 2/5] mm: introduce save_page_flags to cooperate with show_page_flags Muchun Song
2021-07-26 23:18 ` Mike Kravetz
2021-07-27 7:06 ` Muchun Song
2021-07-14 9:17 ` [PATCH 3/5] mm: hugetlb: free the 2nd vmemmap page associated with each HugeTLB page Muchun Song
2021-07-26 21:16 ` Matthew Wilcox
2021-07-26 23:56 ` Mike Kravetz
2021-07-27 7:15 ` Muchun Song
2021-07-14 9:17 ` [PATCH 4/5] mm: hugetlb: replace hugetlb_free_vmemmap_enabled with a static_key Muchun Song
2021-07-14 9:18 ` [PATCH 5/5] mm: sparsemem: use page table lock to protect kernel pmd operations Muchun Song
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