From: David Brown <davidb@codeaurora.org>
Date: Thu, 1 Oct 2009 16:43:29 +0000 (+0100)
Subject: ARM: 5739/1: ARM: allow empty ATAG_CORE
X-Git-Tag: 2.1b_release~10716^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=31abdb744179159f8b605f56da5b197b188e1689;p=platform%2Fkernel%2Fkernel-mfld-blackbay.git

ARM: 5739/1: ARM: allow empty ATAG_CORE

From: David Brown <davidb@quicinc.com>

The ATAG_CORE is allowed to be empty.  Although this is handled
by parse_tag_core(), __vet_atags during startup rejects this tag
unless it contains data.  Allow the initial tag to be either the
full size, or empty.

Signed-off-by: David Brown <davidb@quicinc.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index 93ad576..885a721 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S
@@ -13,6 +13,7 @@
 
 #define ATAG_CORE 0x54410001
 #define ATAG_CORE_SIZE ((2*4 + 3*4) >> 2)
+#define ATAG_CORE_SIZE_EMPTY ((2*4) >> 2)
 
 	.align	2
 	.type	__switch_data, %object
@@ -251,7 +252,8 @@ __vet_atags:
 	bne	1f
 
 	ldr	r5, [r2, #0]			@ is first tag ATAG_CORE?
-	subs	r5, r5, #ATAG_CORE_SIZE
+	cmp	r5, #ATAG_CORE_SIZE
+	cmpne	r5, #ATAG_CORE_SIZE_EMPTY
 	bne	1f
 	ldr	r5, [r2, #4]
 	ldr	r6, =ATAG_CORE