linux-kernel - [PATCH] ARM: replace magic number with PAGE_SHIFT macro in fixup

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Message-Id: <1417155041-29735-1-git-send-email-yamada.m@jp.panasonic.com>
Date:	Fri, 28 Nov 2014 15:10:41 +0900
From:	Masahiro Yamada <yamada.m@...panasonic.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Masahiro Yamada <yamada.m@...panasonic.com>,
	Russell King <linux@....linux.org.uk>,
	Nicolas Pitre <nico@...aro.org>, Sekhar Nori <nsekhar@...com>,
	Rob Herring <robh@...nel.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Victor Kamensky <victor.kamensky@...aro.org>,
	Christopher Covington <cov@...eaurora.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: replace magic number with PAGE_SHIFT macro in fixup_pv code

This line converts PHYS_OFFSET into PHYS_PFN_OFFSET.
It is better to use PAGE_SHIFT rather than the magic number 12.

Signed-off-by: Masahiro Yamada <yamada.m@...panasonic.com>
---

 arch/arm/kernel/head.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 664eee8..ecb7be8 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -586,7 +586,7 @@ __fixup_pv_table:
 	add	r5, r5, r3	@ adjust table end address
 	add	r6, r6, r3	@ adjust __pv_phys_pfn_offset address
 	add	r7, r7, r3	@ adjust __pv_offset address
-	mov	r0, r8, lsr #12	@ convert to PFN
+	mov	r0, r8, lsr #PAGE_SHIFT	@ convert to PFN
 	str	r0, [r6]	@ save computed PHYS_OFFSET to __pv_phys_pfn_offset
 	strcc	ip, [r7, #HIGH_OFFSET]	@ save to __pv_offset high bits
 	mov	r6, r3, lsr #24	@ constant for add/sub instructions
-- 
1.9.1

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