linux-kernel - Re: [PATCH/RFC] Re: linux-next: build failure after merge of the luto-misc tree

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Message-ID: <20160720092157.7cd8de65@canb.auug.org.au>
Date:	Wed, 20 Jul 2016 09:21:57 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC] Re: linux-next: build failure after merge of the
 luto-misc tree

Hi Arnaldo,

On Tue, 19 Jul 2016 14:45:51 -0300 Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> No such luck, everything works as expected, objtool doesn't even get
> compiled, likely it doesn't support powerpc binaries so it isn't built:

right.

> Probably it got the local definition of bitsperlong.h, i.e. the size on the host build
> and then comparing it against the one for the target host...
> 
> Anyway, can you try the patch below to see what value is landing on __BITS_PER_LONG?
> 
> diff --git a/tools/include/asm-generic/bitsperlong.h b/tools/include/asm-generic/bitsperlong.h
> index 45eca517efb3..c8f971e0d6a1 100644
> --- a/tools/include/asm-generic/bitsperlong.h
> +++ b/tools/include/asm-generic/bitsperlong.h
> @@ -10,6 +10,9 @@
>  #endif
>  
>  #if BITS_PER_LONG != __BITS_PER_LONG
> +#include <linux/stringify.h>
> +#pragma message "BITS_PER_LONG=" __stringify(BITS_PER_LONG)
> +#pragma message "__BITS_PER_LONG=" __stringify(__BITS_PER_LONG)
>  #error Inconsistent word size. Check asm/bitsperlong.h
>  #endif

I added those three lines to the file (just in yesterday's linux-next
was easiest) and got this:

/home/sfr/next/next/tools/include/asm-generic/bitsperlong.h:14:9: note: #pragma message: BITS_PER_LONG=(8 * 8)
 #pragma message "BITS_PER_LONG=" __stringify(BITS_PER_LONG)
         ^
/home/sfr/next/next/tools/include/asm-generic/bitsperlong.h:15:9: note: #pragma message: __BITS_PER_LONG=32
 #pragma message "__BITS_PER_LONG=" __stringify(__BITS_PER_LONG)
         ^

(a few times, of course)
-- 
Cheers,
Stephen Rothwell