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mm: memory-failure: add unmap_poisoned_folio()

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Add unmap_poisoned_folio() helper which will be reused by
do_migrate_range() from memory hotplug soon.

[akpm@linux-foundation.org: whitespace tweak, per Miaohe Lin]
  Link: https://lkml.kernel.org/r/1f80c7e3-c30d-1ac1-6a36-d1a5f5907f7c@huawei.com
Link: https://lkml.kernel.org/r/20240827114728.3212578-3-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2024-08-27 19:47:25 +08:00 committed by Andrew Morton
parent b62b51d2d1
commit 16038c4fff
2 changed files with 35 additions and 17 deletions
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8
mm/internal.h
View File

@ -1048,6 +1048,8 @@ static inline int find_next_best_node(int node, nodemask_t *used_node_mask)
/*
* mm/memory-failure.c
*/
#ifdef CONFIG_MEMORY_FAILURE
void unmap_poisoned_folio(struct folio *folio, enum ttu_flags ttu);
void shake_folio(struct folio *folio);
extern int hwpoison_filter(struct page *p);
@ -1068,6 +1070,12 @@ void add_to_kill_ksm(struct task_struct *tsk, struct page *p,
unsigned long ksm_addr);
unsigned long page_mapped_in_vma(struct page *page, struct vm_area_struct *vma);
#else
static inline void unmap_poisoned_folio(struct folio *folio, enum ttu_flags ttu)
{
}
#endif
extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long,
unsigned long, unsigned long,
unsigned long, unsigned long);

44
mm/memory-failure.c
View File

@ -1554,6 +1554,32 @@ static int get_hwpoison_page(struct page *p, unsigned long flags)
return ret;
}
void unmap_poisoned_folio(struct folio *folio, enum ttu_flags ttu)
{
if (folio_test_hugetlb(folio) && !folio_test_anon(folio)) {
struct address_space *mapping;
/*
* For hugetlb folios in shared mappings, try_to_unmap
* could potentially call huge_pmd_unshare. Because of
* this, take semaphore in write mode here and set
* TTU_RMAP_LOCKED to indicate we have taken the lock
* at this higher level.
*/
mapping = hugetlb_folio_mapping_lock_write(folio);
if (!mapping) {
pr_info("%#lx: could not lock mapping for mapped hugetlb folio\n",
folio_pfn(folio));
return;
}
try_to_unmap(folio, ttu|TTU_RMAP_LOCKED);
i_mmap_unlock_write(mapping);
} else {
try_to_unmap(folio, ttu);
}
}
/*
* Do all that is necessary to remove user space mappings. Unmap
* the pages and send SIGBUS to the processes if the data was dirty.
@ -1615,23 +1641,7 @@ static bool hwpoison_user_mappings(struct folio *folio, struct page *p,
*/
collect_procs(folio, p, &tokill, flags & MF_ACTION_REQUIRED);
if (folio_test_hugetlb(folio) && !folio_test_anon(folio)) {
/*
* For hugetlb pages in shared mappings, try_to_unmap
* could potentially call huge_pmd_unshare. Because of
* this, take semaphore in write mode here and set
* TTU_RMAP_LOCKED to indicate we have taken the lock
* at this higher level.
*/
mapping = hugetlb_folio_mapping_lock_write(folio);
if (mapping) {
try_to_unmap(folio, ttu|TTU_RMAP_LOCKED);
i_mmap_unlock_write(mapping);
} else
pr_info("%#lx: could not lock mapping for mapped huge page\n", pfn);
} else {
try_to_unmap(folio, ttu);
}
unmap_poisoned_folio(folio, ttu);
unmap_success = !folio_mapped(folio);
if (!unmap_success)