Messages in this thread |  | | Date | Tue, 3 Nov 2020 14:08:16 +0300 | From | "Kirill A. Shutemov" <> | Subject | Re: [PATCH v3 2/4] PM: hibernate: make direct map manipulations more explicit |
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On Sun, Nov 01, 2020 at 07:08:13PM +0200, Mike Rapoport wrote: > diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c > index 46b1804c1ddf..054c8cce4236 100644 > --- a/kernel/power/snapshot.c > +++ b/kernel/power/snapshot.c > @@ -76,6 +76,32 @@ static inline void hibernate_restore_protect_page(void *page_address) {} > static inline void hibernate_restore_unprotect_page(void *page_address) {} > #endif /* CONFIG_STRICT_KERNEL_RWX && CONFIG_ARCH_HAS_SET_MEMORY */ > > +static inline void hibernate_map_page(struct page *page, int enable) > +{ > + if (IS_ENABLED(CONFIG_ARCH_HAS_SET_DIRECT_MAP)) { > + unsigned long addr = (unsigned long)page_address(page); > + int ret; > + > + /* > + * This should not fail because remapping a page here means > + * that we only update protection bits in an existing PTE. > + * It is still worth to have WARN_ON() here if something > + * changes and this will no longer be the case. > + */ > + if (enable) > + ret = set_direct_map_default_noflush(page); > + else > + ret = set_direct_map_invalid_noflush(page); > + > + if (WARN_ON(ret))
_ONCE? > + return; > + > + flush_tlb_kernel_range(addr, addr + PAGE_SIZE); > + } else { > + debug_pagealloc_map_pages(page, 1, enable); > + } > +} > + > static int swsusp_page_is_free(struct page *); > static void swsusp_set_page_forbidden(struct page *); > static void swsusp_unset_page_forbidden(struct page *);
-- Kirill A. Shutemov
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