linux-kernel - [PATCH] [FIX] init/Kconfig: fix option to disable kernel compression

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Message-Id: <1384534267-14746-1-git-send-email-christian.ruppert@abilis.com>
Date:	Fri, 15 Nov 2013 17:51:07 +0100
From:	Christian Ruppert <christian.ruppert@...lis.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pavel Roskin <proski@....org>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christian Ruppert <christian.ruppert@...lis.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>, Noam Camus <noamc@...hip.com>,
	Joe Perches <joe@...ches.com>
Subject: [PATCH] [FIX] init/Kconfig: fix option to disable kernel compression

Some architectures with self-decompressing kernel images did not compile
with commit 69f0554ec261fd686ac7fa1c598cc9eb27b83a80 because they don't
provide a non-decompression mechanism for uncompressed kernels.

Rectify this problem by allowing uncompressed kernels only for architectures
which explicitly state they support them.

Signed-off-by: Christian Ruppert <christian.ruppert@...lis.com>
---
 arch/arc/Kconfig | 2 ++
 init/Kconfig     | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 2ee0c9b..15f4c3d 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -21,6 +21,8 @@ config ARC
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_IOREMAP_PROT
+	select HAVE_KERNEL_UNCOMPRESSED
+	select HAVE_KERNEL_GZIP
 	select HAVE_KPROBES
 	select HAVE_KRETPROBES
 	select HAVE_MEMBLOCK
diff --git a/init/Kconfig b/init/Kconfig
index 5496f30..d4baf2e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -97,6 +97,9 @@ config LOCALVERSION_AUTO
 
 	  which is done within the script "scripts/setlocalversion".)
 
+config HAVE_KERNEL_UNCOMPRESSED
+        bool
+
 config HAVE_KERNEL_GZIP
 	bool
 
@@ -118,6 +121,7 @@ config HAVE_KERNEL_LZ4
 choice
 	prompt "Kernel compression mode"
 	default KERNEL_GZIP
+	depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4 || HAVE_KERNEL_UNCOMPRESSED
 	help
 	  The linux kernel is a kind of self-extracting executable.
 	  Several compression algorithms are available, which differ
@@ -138,6 +142,7 @@ choice
 
 config KERNEL_UNCOMPRESSED
 	bool "No compression"
+	depends on HAVE_KERNEL_UNCOMPRESSED
 	help
 	  No compression at all. The kernel is huge but the compression and
 	  decompression times are zero.
-- 
1.8.4

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