linux-kernel - [PATCH 1/2] arm:omap2+: put omap_uart_phys/virt/lsr in .text section when ZIMAGE is true

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Message-Id: <1496888232-30764-1-git-send-email-hoeun.ryu@gmail.com>
Date:   Thu,  8 Jun 2017 11:16:53 +0900
From:   Hoeun Ryu <hoeun.ryu@...il.com>
To:     Russell King <linux@...linux.org.uk>
Cc:     Hoeun Ryu <hoeun.ryu@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] arm:omap2+: put omap_uart_phys/virt/lsr in .text section when ZIMAGE is true

 omap_uart_phys, omap_uart_virt and omap_uart_lsr reside in .data section
and it's right implementation. But because of this, we cannot enable
CONFIG_DEBUG_UNCOMPRESS. LL_DEBUG and DEBUG_UNCOMPRESS are very useful tools
for debugging early boot stage when something goes wrong if you don't have
any hardware based debugging tools like a JTAG debugger.
 This patch is to put the variables into .text section instead only when the
DEBUG_LL_INCLUDE file is included in the kernel decompressor, which is only
when ZIMAGE is defined.
 This patch does not change anything when DEBUG_LL_INCLUDE is included in
the other kernel parts like arch/arm/kernel/*

Signed-off-by: Hoeun Ryu <hoeun.ryu@...il.com>
---
 arch/arm/include/debug/omap2plus.S | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm/include/debug/omap2plus.S b/arch/arm/include/debug/omap2plus.S
index 6d867ae..6ce6ef9 100644
--- a/arch/arm/include/debug/omap2plus.S
+++ b/arch/arm/include/debug/omap2plus.S
@@ -58,11 +58,22 @@

 #define UART_OFFSET(addr)	((addr) & 0x00ffffff)

+/*
+ * Definition of ZIMAGE is in arch/arm/boot/compressed/Makefile.
+ * Place the following block in .text section only when this file is
+ * included by arch/arm/boot/compressed/* to make it possible to
+ * enable CONFIG_DEBUG_UNCOMPRESS and DEBUG in arch/arm/boot/compressed/head.S
+ * on OMAP2+ SoCs.
+ */
+#ifndef ZIMAGE
 		.pushsection .data
+#endif
 omap_uart_phys:	.word	0
 omap_uart_virt:	.word	0
 omap_uart_lsr:	.word	0
+#ifndef ZIMAGE
 		.popsection
+#endif

 		.macro	addruart, rp, rv, tmp

-- 
2.7.4