linux-kernel - [PATCH] ARM: drop unused DEBUG_RODATA from XIP

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Message-ID: <20160216202957.GA1826@www.outflux.net>
Date:	Tue, 16 Feb 2016 12:29:57 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Russell King <linux@....linux.org.uk>
Cc:	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Chris Brandt <Chris.Brandt@...esas.com>,
	Will Deacon <will.deacon@....com>,
	Nicolas Pitre <nico@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: drop unused DEBUG_RODATA from XIP_KERNEL

With CONFIG_DEBUG_RODATA not being sensible under XIP_KERNEL, remove it
from the XIP linker script.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
Effectively the patch after Arnd's "ARM: mm: hide
__start_rodata_section_aligned for non-debug builds"
---
 arch/arm/kernel/vmlinux-xip.lds.S | 10 ----------
 1 files changed, 0 insertions(+), 10 deletions(-)

diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S
index 40bc4cadb959..cba1ec899a69 100644
--- a/arch/arm/kernel/vmlinux-xip.lds.S
+++ b/arch/arm/kernel/vmlinux-xip.lds.S
@@ -8,9 +8,6 @@
 #include <asm/thread_info.h>
 #include <asm/memory.h>
 #include <asm/page.h>
-#ifdef CONFIG_DEBUG_RODATA
-#include <asm/pgtable.h>
-#endif
 
 #define PROC_INFO							\
 	. = ALIGN(4);							\
@@ -92,10 +89,6 @@ SECTIONS
 		HEAD_TEXT
 	}
 
-#ifdef CONFIG_DEBUG_RODATA
-	. = ALIGN(1<<SECTION_SHIFT);
-#endif
-
 	.text : {			/* Real text segment		*/
 		_stext = .;		/* Text and read-only data	*/
 			IDMAP_TEXT
@@ -115,9 +108,6 @@ SECTIONS
 			ARM_CPU_KEEP(PROC_INFO)
 	}
 
-#ifdef CONFIG_DEBUG_RODATA
-	. = ALIGN(1<<SECTION_SHIFT);
-#endif
 	RO_DATA(PAGE_SIZE)
 
 	. = ALIGN(4);
-- 
2.6.3


-- 
Kees Cook
Chrome OS & Brillo Security