linux-kernel - Re: [PATCH] x86: fix two sparse warnings in early boot string handling

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Date:	Wed, 12 Feb 2014 14:00:18 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
cc:	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Re: [PATCH] x86: fix two sparse warnings in early boot string
 handling

On Wed, 12 Feb 2014, Paul Gortmaker wrote:

> Actually no v2 pending.  The original v1 patch was/is correct as-is.
> 
> While x86-64 defconfig passed, it turns out that both strcmp and strstr
> have to stay, else we will get this on i386 allyesconfig builds:
> 
> arch/x86/boot/compressed/eboot.o: In function `handle_cmdline_files.isra.5.constprop.6':
> eboot.c:(.text+0x4cf): undefined reference to `strstr'
> eboot.c:(.text+0x601): undefined reference to `strstr'
> make[2]: *** [arch/x86/boot/compressed/vmlinux] Error 1
> 

This means there is a strstr() prototype that is visible to 
drivers/firmware/efi/efi-stub-helper.c but fails at linkage because you've 
removed the definition.  So, again, why would you add a duplicate 
prototype with your patch?

> arch/x86/boot/edd.o: In function `query_edd':
> arch/x86/boot/edd.c:136: undefined reference to `strcmp'
> arch/x86/boot/edd.c:136: undefined reference to `strcmp'
> arch/x86/boot/edd.c:140: undefined reference to `strcmp'
> arch/x86/boot/edd.c:142: undefined reference to `strcmp'
> make[1]: *** [arch/x86/boot/setup.elf] Error 1
> 
> So my gut feeling was right after all.  ;)
> 

I'm not sure what strcmp has to do with this.
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