linux-kernel - Re: [PATCH v2] arm64: extable: sort the exception table at build time

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Message-ID: <20130530152746.GV7483@mudshark.cambridge.arm.com>
Date:	Thu, 30 May 2013 16:27:47 +0100
From:	Will Deacon <will.deacon@....com>
To:	Catalin Marinas <Catalin.Marinas@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"david.daney@...ium.com" <david.daney@...ium.com>,
	"sam@...nborg.org" <sam@...nborg.org>, heiko.carstens@...ibm.com
Subject: Re: [PATCH v2] arm64: extable: sort the exception table at build time

On Wed, May 22, 2013 at 07:03:32PM +0100, Will Deacon wrote:
> As is done for other architectures, sort the exception table at
> build-time rather than during boot.
> 
> Since sortextable appears to be a standalone C program relying on the
> host elf.h to provide EM_AARCH64, I've had to add a conditional check in
> order to allow cross-compilation on machines that aren't running a
> bleeding-edge libc-dev.
> 
> Signed-off-by: Will Deacon <will.deacon@....com>
> ---
>  arch/arm64/Kconfig              |  1 +
>  arch/arm64/kernel/vmlinux.lds.S | 10 +---------
>  scripts/sortextable.c           |  5 +++++
>  3 files changed, 7 insertions(+), 9 deletions(-)

[...]

> diff --git a/scripts/sortextable.c b/scripts/sortextable.c
> index 1f10e89..f9ce116 100644
> --- a/scripts/sortextable.c
> +++ b/scripts/sortextable.c
> @@ -31,6 +31,10 @@
>  #include <tools/be_byteshift.h>
>  #include <tools/le_byteshift.h>
>  
> +#ifndef EM_AARCH64
> +#define EM_AARCH64	183
> +#endif
> +
>  static int fd_map;	/* File descriptor for file being modified. */
>  static int mmap_failed; /* Boolean flag. */
>  static void *ehdr_curr; /* current ElfXX_Ehdr *  for resource cleanup */
> @@ -249,6 +253,7 @@ do_file(char const *const fname)
>  		custom_sort = sort_relative_table;
>  		break;
>  	case EM_ARM:
> +	case EM_AARCH64:
>  	case EM_MIPS:
>  		break;
>  	}  /* end switch */

Any chance I can have an ack for this part of the patch please? Then we can
take it through the arm64 tree.

Cheers,

Will
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