linux-kernel - [PATCH 2/2] mm/page_owner: determine the last stack state of page with CONFIG_KASAN_DUMP

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Date:   Wed, 4 Sep 2019 14:57:36 +0800
From:   Walter Wu <walter-zh.wu@...iatek.com>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michal Hocko <mhocko@...e.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <kasan-dev@...glegroups.com>,
        <linux-mm@...ck.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
        Walter Wu <walter-zh.wu@...iatek.com>
Subject: [PATCH 2/2] mm/page_owner: determine the last stack state of page with CONFIG_KASAN_DUMP_PAGE=y

When enable CONFIG_KASAN_DUMP_PAGE, then page_owner will record last stack,
So we need to know the last stack is allocation or free state.

Signed-off-by: Walter Wu <walter-zh.wu@...iatek.com>
---
 mm/page_owner.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/page_owner.c b/mm/page_owner.c
index addcbb2ae4e4..2756adca250e 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -418,6 +418,12 @@ void __dump_page_owner(struct page *page)
 	nr_entries = stack_depot_fetch(handle, &entries);
 	pr_alert("page allocated via order %u, migratetype %s, gfp_mask %#x(%pGg)\n",
 		 page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask);
+#ifdef CONFIG_KASAN_DUMP_PAGE
+	if ((unsigned long)page->flags & PAGE_FLAGS_CHECK_AT_PREP)
+		pr_info("Allocation stack of page:\n");
+	else
+		pr_info("Free stack of page:\n");
+#endif
 	stack_trace_print(entries, nr_entries, 0);
 
 	if (page_owner->last_migrate_reason != -1)
-- 
2.18.0