linux-kernel - Re: [PATCH 3/4] s390: enable text relative kallsyms for 64-bit targets

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Message-ID: <20160120094326.GD3395@osiris>
Date:	Wed, 20 Jan 2016 10:43:26 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
	keescook@...omium.org, akpm@...ux-foundation.org, mingo@...nel.org,
	hpa@...or.com, benh@...nel.crashing.org, mpe@...erman.id.au,
	mmarek@...e.cz, rusty@...tcorp.com.au
Subject: Re: [PATCH 3/4] s390: enable text relative kallsyms for 64-bit
 targets

On Wed, Jan 20, 2016 at 10:05:37AM +0100, Ard Biesheuvel wrote:
> This enables the newly introduced text-relative kallsyms support when
> building 64-bit targets. This cuts the size of the kallsyms address
> table in half, reducing the memory footprint of the kernel .rodata
> section by about 250 KB for a defconfig build.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> ---
> 
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index dbeeb3a049f2..588160fd1db0 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -149,6 +149,7 @@ config S390
>  	select HAVE_REGS_AND_STACK_ACCESS_API
>  	select HAVE_SYSCALL_TRACEPOINTS
>  	select HAVE_VIRT_CPU_ACCOUNTING
> +	select KALLSYMS_TEXT_RELATIVE if 64BIT

Please remove the "if 64BIT" since s390 is always 64BIT in the meantime.
Tested on s390 and everything seems still to work ;)

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>