linux-kernel - Re: mmotm 2010-01-06-14-34 uploaded (squashfs+lib/decomp)

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Message-Id: <20100107080402.2f41d6f9.randy.dunlap@oracle.com>
Date:	Thu, 7 Jan 2010 08:04:02 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Valdis.Kletnieks@...edu
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: mmotm 2010-01-06-14-34 uploaded (squashfs+lib/decomp)

On Wed, 06 Jan 2010 23:01:47 -0500 Valdis.Kletnieks@...edu wrote:

> On Wed, 06 Jan 2010 22:48:16 EST, Valdis.Kletnieks@...edu said:
> 
> > Building with CONFIG_SQUASHFS=m, CONFIG_SQUASHFS_LZMA=y ,
> > and CONFIG_DECOMPRESS_LZMA=n fails:
> 
> > Looks like a missing select/depends for DECOMPRESS_LZMA.  Somebody else can
> > decide which it should be...
> 
> Digging further:
>   
>   x Symbol: DECOMPRESS_LZMA [=n]                                            x  
>   x   Selected by: RD_LZMA [=n] && BLK_DEV_INITRD [=y] || SQUASHFS_LZMA [=y x  
> 
> How the heck did this happen?  Looks like a SELECT *is* there but it's
> not firing??!?

I saw this build error in linux-next and sent a patch for it -- it's below.
However, it doesn't appear to be exactly the same config as yours.


---
From: Randy Dunlap <randy.dunlap@...cle.com>

When CONFIG_SQUASHFS=m and CONFIG_DECOMPRESS_LZMA=m, decompress_lzma
is built but then discarded from the library because no built-in code
uses it, so change it from a lib- to an obj- to force it to be kept
in the library.

ERROR: "unlzma" [fs/squashfs/squashfs.ko] undefined!

Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
Cc: Phillip Lougher <phillip@...gher.demon.co.uk>
Cc: Michal Marek <mmarek@...e.cz>
---
 lib/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20100101.orig/lib/Makefile
+++ linux-next-20100101/lib/Makefile
@@ -69,7 +69,7 @@ obj-$(CONFIG_LZO_DECOMPRESS) += lzo/
 
 lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
 lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
-lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
+obj-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
 
 obj-$(CONFIG_TEXTSEARCH) += textsearch.o
 obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o
--
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