linux-kernel - Re: [Suggestion] tile: include: asm: missing "feedback.h" file.

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Message-ID: <51CC492C.1040105@tilera.com>
Date:	Thu, 27 Jun 2013 10:16:12 -0400
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Chen Gang <gang.chen@...anux.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Suggestion] tile: include: asm: missing "feedback.h" file.

On 6/26/2013 12:25 AM, Chen Gang wrote:
> Hello Maintainers:
>
> The compilation failed by "make ARCH=tile tilegx_defconfig", and "make
> ARCH=tile CROSS_COMPILE=tile-linux-gnu-" for upstream next-20130625.
>
> The related error:
>
>     CC      kernel/bounds.s
>   In file included from include/linux/linkage.h:7:0,
>                    from include/linux/kernel.h:6,
>                    from include/asm-generic/bug.h:13,
>                    from arch/tile/include/generated/asm/bug.h:1,
>                    from include/linux/bug.h:4,
>                    from include/linux/page-flags.h:9,
>                    from kernel/bounds.c:9:
>   /root/linux-next/arch/tile/include/asm/linkage.h:18:22: fatal error: feedback.h: No such file or directory
>
> We really need "feedback.h"
>
>   arch/tile/kernel/entry.S: Assembler messages:
>   arch/tile/kernel/entry.S:26: Error: Unknown opcode `feedback_enter(current_text_addr)'.
>   arch/tile/kernel/entry.S:46: Error: Unknown opcode `feedback_enter(dump_stack)'.
>   arch/tile/kernel/entry.S:53: Error: Unknown opcode `feedback_enter(KBacktraceIterator_init_current)'.
>   arch/tile/kernel/entry.S:61: Error: Unknown opcode `feedback_enter(smp_nap)'.
>   arch/tile/kernel/entry.S:76: Error: Unknown opcode `feedback_enter(_cpu_idle)'.
>
> Welcome any suggestions and completions.

This is fixed in gcc 4.7.2 or later.  For the workaround, see:

http://www.tilera.com/scm/source.html#feedback_h

Essentially, you just have to create a dummy <feedback.h> header, e.g. for 4.7.1:

  cat > $install/lib/gcc/tilegx-unknown-linux-gnu/4.7.1/include/feedback.h
  #define FEEDBACK_ENTER_EXPLICIT(FUNCNAME, SECNAME, SIZE)
  #define FEEDBACK_ENTER(FUNCNAME)
  #define FEEDBACK_REENTER(FUNCNAME)
  #define FEEDBACK_ENTRY(FUNCNAME, SECNAME, SIZE)
  ^D

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com

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