linux-kernel - [PATCH] mm/page_alloc: avoid hard lockups in __alloc_pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210710112929.232268-1-qiang.zhang@windriver.com>
Date:   Sat, 10 Jul 2021 19:29:29 +0800
From:   qiang.zhang@...driver.com
To:     mgorman@...hsingularity.net, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm/page_alloc: avoid hard lockups in __alloc_pages_bulk()

From: Zqiang <qiang.zhang@...driver.com>

The __alloc_pages_bulk() mainly used for batch allocation of
order-0 pages, in the case of holding pagesets.lock, if too
many pages are required, maybe trigger hard lockup watchdog.

Signed-off-by: Zqiang <qiang.zhang@...driver.com>
---
 mm/page_alloc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d6e94cc8066c..1127db25507f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5315,6 +5315,8 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
 		else
 			page_array[nr_populated] = page;
 		nr_populated++;
+
+		touch_nmi_watchdog();
 	}
 
 	local_unlock_irqrestore(&pagesets.lock, flags);
-- 
2.25.1