From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with ESMTP id 2CAF66B02A5 for ; Thu, 5 Aug 2010 10:37:32 -0400 (EDT) From: Jason Wessel Subject: [PATCH 14/17] mm,kdb,kgdb: Add a debug reference for the kdb kmap usage Date: Thu, 5 Aug 2010 09:37:55 -0500 Message-Id: <1281019078-6636-15-git-send-email-jason.wessel@windriver.com> In-Reply-To: <1281019078-6636-14-git-send-email-jason.wessel@windriver.com> References: <1281019078-6636-1-git-send-email-jason.wessel@windriver.com> <1281019078-6636-2-git-send-email-jason.wessel@windriver.com> <1281019078-6636-3-git-send-email-jason.wessel@windriver.com> <1281019078-6636-4-git-send-email-jason.wessel@windriver.com> <1281019078-6636-5-git-send-email-jason.wessel@windriver.com> <1281019078-6636-6-git-send-email-jason.wessel@windriver.com> <1281019078-6636-7-git-send-email-jason.wessel@windriver.com> <1281019078-6636-8-git-send-email-jason.wessel@windriver.com> <1281019078-6636-9-git-send-email-jason.wessel@windriver.com> <1281019078-6636-10-git-send-email-jason.wessel@windriver.com> <1281019078-6636-11-git-send-email-jason.wessel@windriver.com> <1281019078-6636-12-git-send-email-jason.wessel@windriver.com> <1281019078-6636-13-git-send-email-jason.wessel@windriver.com> <1281019078-6636-14-git-send-email-jason.wessel@windriver.com> Sender: owner-linux-mm@kvack.org To: torvalds@linux-foundation.org Cc: linux-kernel@vger.kernel.org, kgdb-bugreport@lists.sourceforge.net, Jason Wessel , Andrew Morton , Ingo Molnar , linux-mm@kvack.org List-ID: The kdb kmap should never get used outside of the kernel debugger exception context. Signed-off-by: Jason Wessel CC: Andrew Morton CC: Ingo Molnar CC: linux-mm@kvack.org --- mm/highmem.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/mm/highmem.c b/mm/highmem.c index 66baa20..7a0aa1b 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -26,6 +26,7 @@ #include #include #include +#include #include /* @@ -470,6 +471,12 @@ void debug_kmap_atomic(enum km_type type) warn_count--; } } +#ifdef CONFIG_KGDB_KDB + if (unlikely(type == KM_KDB && atomic_read(&kgdb_active) == -1)) { + WARN_ON(1); + warn_count--; + } +#endif /* CONFIG_KGDB_KDB */ } #endif -- 1.6.3.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org