linux-kernel - [PATCH] replace spin_lock_irqsave with spin

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Message-Id: <6.0.0.20.2.20070328181552.04f827a8@172.19.0.2>
Date:	Wed, 28 Mar 2007 18:16:28 +0900
From:	Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>
To:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: [PATCH] replace spin_lock_irqsave with spin_lock


IRQ is already disabled through local_irq_disable().
So spin_lock_irqsave() can be replaced with spin_lock().

Thanks.

Signed-off-by :Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>

--- linux-2.6.21-rc5.org/arch/i386/kernel/reboot.c	2007-02-05 
03:44:54.000000000 +0900
+++ linux-2.6.21-rc5-test/arch/i386/kernel/reboot.c	2007-03-28 
17:57:56.000000000 +0900
@@ -197,8 +197,6 @@ static unsigned char jump_to_bios [] =
   */
  void machine_real_restart(unsigned char *code, int length)
  {
-	unsigned long flags;
-
  	local_irq_disable();

  	/* Write zero to CMOS register number 0x0f, which the BIOS POST
@@ -211,9 +209,9 @@ void machine_real_restart(unsigned char
  	   safe side.  (Yes, CMOS_WRITE does outb_p's. -  Paul G.)
  	 */

-	spin_lock_irqsave(&rtc_lock, flags);
+	spin_lock(&rtc_lock);
  	CMOS_WRITE(0x00, 0x8f);
-	spin_unlock_irqrestore(&rtc_lock, flags);
+	spin_unlock(&rtc_lock);

  	/* Remap the kernel at virtual address zero, as well as offset zero
  	   from the kernel segment.  This assumes the kernel segment starts at

-
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