linux-kernel - [ 12/57] kernel/reboot.c: re-enable the function of variable reboot

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Message-Id: <20131003040637.445810984@linuxfoundation.org>
Date:	Wed,  2 Oct 2013 21:08:38 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Li Fei <fei.li@...el.com>,
	liu chuansheng <chuansheng.liu@...el.com>,
	Robin Holt <robinmholt@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 12/57] kernel/reboot.c: re-enable the function of variable reboot_default

3.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chuansheng Liu <chuansheng.liu@...el.com>

commit e2f0b88e84eed9cf9797f0a88c8012ee0b885a6d upstream.

Commit 1b3a5d02ee07 ("reboot: move arch/x86 reboot= handling to generic
kernel") did some cleanup for reboot= command line, but it made the
reboot_default inoperative.

The default value of variable reboot_default should be 1, and if command
line reboot= is not set, system will use the default reboot mode.

[akpm@...ux-foundation.org: fix comment layout]
Signed-off-by: Li Fei <fei.li@...el.com>
Signed-off-by: liu chuansheng <chuansheng.liu@...el.com>
Acked-by: Robin Holt <robinmholt@...ux.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/reboot.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -32,7 +32,14 @@ EXPORT_SYMBOL(cad_pid);
 #endif
 enum reboot_mode reboot_mode DEFAULT_REBOOT_MODE;
 
-int reboot_default;
+/*
+ * This variable is used privately to keep track of whether or not
+ * reboot_type is still set to its default value (i.e., reboot= hasn't
+ * been set on the command line).  This is needed so that we can
+ * suppress DMI scanning for reboot quirks.  Without it, it's
+ * impossible to override a faulty reboot quirk without recompiling.
+ */
+int reboot_default = 1;
 int reboot_cpu;
 enum reboot_type reboot_type = BOOT_ACPI;
 int reboot_force;


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