The patch titled
Subject: mm: memory-failure: make put_ref_page() more useful
has been added to the -mm mm-unstable branch. Its filename is
mm-memory-failure-make-put_ref_page-more-useful.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory-failure-make-put_ref_page-more-useful.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Subject: mm: memory-failure: make put_ref_page() more useful
Date: Fri, 21 Oct 2022 16:46:09 +0800
Pass pfn/flags to put_ref_page(), then check MF_COUNT_INCREASED and drop
refcount to make the code look cleaner.
Link: https://lkml.kernel.org/r/20221021084611.53765-1-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 34 +++++++++++++++++-----------------
1 file changed, 17 insertions(+), 17 deletions(-)
--- a/mm/memory-failure.c~mm-memory-failure-make-put_ref_page-more-useful
+++ a/mm/memory-failure.c
@@ -1913,17 +1913,25 @@ static inline unsigned long free_raw_hwp
}
#endif /* CONFIG_HUGETLB_PAGE */
+/* Drop the extra refcount in case we come from madvise() */
+static void put_ref_page(unsigned long pfn, int flags)
+{
+ struct page *page;
+
+ if (!(flags & MF_COUNT_INCREASED))
+ return;
+
+ page = pfn_to_page(pfn);
+ if (page)
+ put_page(page);
+}
+
static int memory_failure_dev_pagemap(unsigned long pfn, int flags,
struct dev_pagemap *pgmap)
{
- struct page *page = pfn_to_page(pfn);
int rc = -ENXIO;
- if (flags & MF_COUNT_INCREASED)
- /*
- * Drop the extra refcount in case we come from madvise().
- */
- put_page(page);
+ put_ref_page(pfn, flags);
/* device metadata space is not recoverable */
if (!pgmap_pfn_valid(pgmap, pfn))
@@ -2516,12 +2524,6 @@ static int soft_offline_in_use_page(stru
return ret;
}
-static void put_ref_page(struct page *page)
-{
- if (page)
- put_page(page);
-}
-
/**
* soft_offline_page - Soft offline a page.
* @pfn: pfn to soft-offline
@@ -2550,19 +2552,17 @@ int soft_offline_page(unsigned long pfn,
{
int ret;
bool try_again = true;
- struct page *page, *ref_page = NULL;
+ struct page *page;
WARN_ON_ONCE(!pfn_valid(pfn) && (flags & MF_COUNT_INCREASED));
if (!pfn_valid(pfn))
return -ENXIO;
- if (flags & MF_COUNT_INCREASED)
- ref_page = pfn_to_page(pfn);
/* Only online pages can be soft-offlined (esp., not ZONE_DEVICE). */
page = pfn_to_online_page(pfn);
if (!page) {
- put_ref_page(ref_page);
+ put_ref_page(pfn, flags);
return -EIO;
}
@@ -2570,7 +2570,7 @@ int soft_offline_page(unsigned long pfn,
if (PageHWPoison(page)) {
pr_info("%s: %#lx page already poisoned\n", __func__, pfn);
- put_ref_page(ref_page);
+ put_ref_page(pfn, flags);
mutex_unlock(&mf_mutex);
return 0;
}
_
Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are
mm-rmap-rename-page_not_mapped-to-folio_not_mapped.patch
mm-remove-kern_addr_valid-completely.patch
nios2-remove-unused-init_mmap.patch
x86-sgx-use-vm_access_flags.patch
mm-mprotect-use-vm_access_flags.patch
mm-debug_vm_pgtable-use-vm_access_flags.patch
amdgpu-use-vm_access_flags.patch
mm-memory-failure-make-put_ref_page-more-useful.patch
mm-memory-failure-avoid-pfn_valid-twice-in-soft_offline_page.patch
mm-memory-failure-make-action_result-return-int.patch
