linux-kernel - Re: [RFC Resend] arm:extend __init

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Date:	Mon, 15 Sep 2014 11:55:25 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>,
	Jiang Liu <jiang.liu@...wei.com>
Cc:	'Will Deacon' <will.deacon@....com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>,
	"'linux-mm@...ck.org'" <linux-mm@...ck.org>
Subject: Re: [RFC Resend] arm:extend __init_end to a page align address

On Mon, Sep 15, 2014 at 06:26:43PM +0800, Wang, Yalin wrote:
> this patch change the __init_end address to a page align address, so that free_initmem()
> can free the whole .init section, because if the end address is not page aligned,
> it will round down to a page align address, then the tail unligned page will not be freed.

Please wrap commit messages at or before column 72 - this makes "git log"
much easier to read once the change has been committed.

I have no objection to the arch/arm part of this patch.  However, since
different people deal with arch/arm and arch/arm64, this patch needs to
be split.

Also, it may be worth patching include/asm-generic/vmlinux.lds.h to
indicate that __initrd_end should be page aligned - this seems to be a
requirement by the (new-ish) free_reserved_area() function, otherwise
it does indeed round down.

(Added Jiang Liu as the person responsible for free_reserved_area() for
any further comments.)

> 
> Signed-off-by: Yalin wang <yalin.wang@...ymobile.com>
> ---
>  arch/arm/kernel/vmlinux.lds.S   | 2 +-
>  arch/arm64/kernel/vmlinux.lds.S | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index 6f57cb9..8e95aa4 100644
> --- a/arch/arm/kernel/vmlinux.lds.S
> +++ b/arch/arm/kernel/vmlinux.lds.S
> @@ -219,8 +219,8 @@ SECTIONS
>  	__data_loc = ALIGN(4);		/* location in binary */
>  	. = PAGE_OFFSET + TEXT_OFFSET;
>  #else
> -	__init_end = .;
>  	. = ALIGN(THREAD_SIZE);
> +	__init_end = .;
>  	__data_loc = .;
>  #endif
>  
> diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index 97f0c04..edf8715 100644
> --- a/arch/arm64/kernel/vmlinux.lds.S
> +++ b/arch/arm64/kernel/vmlinux.lds.S
> @@ -97,9 +97,9 @@ SECTIONS
>  
>  	PERCPU_SECTION(64)
>  
> +	. = ALIGN(PAGE_SIZE);
>  	__init_end = .;
>  
> -	. = ALIGN(PAGE_SIZE);
>  	_data = .;
>  	_sdata = .;
>  	RW_DATA_SECTION(64, PAGE_SIZE, THREAD_SIZE)
> --
> 1.9.2.msysgit.0

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