23fb3111f6
If page_pinner is configured with page_pinner_enabled=false and
failure_tracking=true, pp_buffer will be accessed without being
initialized. Prevent this by adding page_pinner_inited checks in
functions that access it.
Fixes: 898cfbf094 ("ANDROID: mm: introduce page_pinner")
Bug: 259024332
Bug: 260179017
Change-Id: I8f612cae3e74d36e8a4eee5edec25281246cbe5e
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_PAGE_PINNER_H
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#define __LINUX_PAGE_PINNER_H
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#include <linux/jump_label.h>
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#ifdef CONFIG_PAGE_PINNER
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extern struct static_key_false page_pinner_inited;
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extern struct static_key_true failure_tracking;
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extern struct page_ext_operations page_pinner_ops;
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extern void __free_page_pinner(struct page *page, unsigned int order);
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void __page_pinner_failure_detect(struct page *page);
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void __page_pinner_put_page(struct page *page);
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static inline void free_page_pinner(struct page *page, unsigned int order)
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{
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if (static_branch_unlikely(&page_pinner_inited))
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__free_page_pinner(page, order);
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}
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static inline void page_pinner_put_page(struct page *page)
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{
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if (!static_branch_unlikely(&page_pinner_inited))
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return;
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if (!static_branch_unlikely(&failure_tracking))
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return;
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__page_pinner_put_page(page);
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}
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static inline void page_pinner_failure_detect(struct page *page)
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{
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if (!static_branch_unlikely(&page_pinner_inited))
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return;
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if (!static_branch_unlikely(&failure_tracking))
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return;
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__page_pinner_failure_detect(page);
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}
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#else
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static inline void free_page_pinner(struct page *page, unsigned int order)
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{
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}
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static inline void page_pinner_put_page(struct page *page)
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{
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}
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static inline void page_pinner_failure_detect(struct page *page)
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{
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}
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#endif /* CONFIG_PAGE_PINNER */
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#endif /* __LINUX_PAGE_PINNER_H */
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