[PATCH v9 03/96] mm/debug: Factor PagePoisoned out of __dump_page
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: 2021-05-05 15:09:59
Also in:
linux-fsdevel, lkml
Subsystem:
memory management, memory management - core, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
Move the PagePoisoned test into dump_page(). Skip the hex print for poisoned pages -- we know they're full of ffffffff. Move the reason printing from __dump_page() to dump_page(). Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: William Kucharski <redacted> Reviewed-by: Vlastimil Babka <redacted> Reviewed-by: Anshuman Khandual <redacted> --- mm/debug.c | 25 +++++++------------------ 1 file changed, 7 insertions(+), 18 deletions(-)
diff --git a/mm/debug.c b/mm/debug.c
index 84cdcd0f7bd3..e73fe0a8ec3d 100644
--- a/mm/debug.c
+++ b/mm/debug.c@@ -42,11 +42,10 @@ const struct trace_print_flags vmaflag_names[] = { {0, NULL} }; -static void __dump_page(struct page *page, const char *reason) +static void __dump_page(struct page *page) { struct page *head = compound_head(page); struct address_space *mapping; - bool page_poisoned = PagePoisoned(page); bool compound = PageCompound(page); /* * Accessing the pageblock without the zone lock. It could change to
@@ -58,16 +57,6 @@ static void __dump_page(struct page *page, const char *reason) int mapcount; char *type = ""; - /* - * If struct page is poisoned don't access Page*() functions as that - * leads to recursive loop. Page*() check for poisoned pages, and calls - * dump_page() when detected. - */ - if (page_poisoned) { - pr_warn("page:%px is uninitialized and poisoned", page); - goto hex_only; - } - if (page < head || (page >= head + MAX_ORDER_NR_PAGES)) { /* * Corrupt page, so we cannot call page_mapping. Instead, do a
@@ -173,8 +162,6 @@ static void __dump_page(struct page *page, const char *reason) pr_warn("%sflags: %#lx(%pGp)%s\n", type, head->flags, &head->flags, page_cma ? " CMA" : ""); - -hex_only: print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32, sizeof(unsigned long), page, sizeof(struct page), false);
@@ -182,14 +169,16 @@ static void __dump_page(struct page *page, const char *reason) print_hex_dump(KERN_WARNING, "head: ", DUMP_PREFIX_NONE, 32, sizeof(unsigned long), head, sizeof(struct page), false); - - if (reason) - pr_warn("page dumped because: %s\n", reason); } void dump_page(struct page *page, const char *reason) { - __dump_page(page, reason); + if (PagePoisoned(page)) + pr_warn("page:%p is uninitialized and poisoned", page); + else + __dump_page(page); + if (reason) + pr_warn("page dumped because: %s\n", reason); dump_page_owner(page); } EXPORT_SYMBOL(dump_page);
--
2.30.2