Re: Warning messages

[Jörn Engel]

On Sat, 1 May 2004 22:55:59 +0100, linux-kernel-owner+joern=40wohnheim.fh-wedel.de-S262920AbUEBBnc@xxxxxxxxxxxxxxx wrote:
> 
>     Everytime I compile the 2.6.5 Linux kernel I get these warning messages:
> 
>   AS	arch/i386/boot/setup.o
> /usr/src/linux-2.6.5/arch/i386/boot/setup.S: Assembler messages:
> /usr/src/linux-2.6.5/arch/i386/boot/setup.S:159: Warning: value 0x37ffffff truncated to 0x37ffffff
> 
>     What does it mean?

That the kernel depends on a funny side effect of the assembler.  It's
harmless, but if you don't like it, apply the patch below.  Linus,
would you consider it as well?

Jörn

-- 
When in doubt, use brute force.
-- Ken Thompson


The warning is correct, the calculated value for ramdisk_max would be
0xb7ffffff instead of 0x37ffffff.  Truncating 0xb7ffffff to 0x37ffffff
is desired behaviour, so we should do it explicitly.

 setup.S |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

--- linux-2.6.1/arch/i386/boot/setup.S~initrd_warning	2004-03-09 11:37:29.000000000 +0100
+++ linux-2.6.1/arch/i386/boot/setup.S	2004-03-09 11:38:59.000000000 +0100
@@ -162,7 +162,8 @@
 					# can be located anywhere in
 					# low memory 0x10000 or higher.
 
-ramdisk_max:	.long MAXMEM-1		# (Header version 0x0203 or later)
+ramdisk_max:	.long (MAXMEM-1) & 0x7fffffff
+					# (Header version 0x0203 or later)
 					# The highest safe address for
 					# the contents of an initrd
 
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