From: Will Deacon <will.deacon@arm.com>
To: Mark Salter <msalter@redhat.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Catalin Marinas <Catalin.Marinas@arm.com>
Subject: Re: [PATCH] arm64: add PAGE_ALIGNED_DATA to linker script
Date: Wed, 9 Oct 2013 11:14:48 +0100 [thread overview]
Message-ID: <20131009101447.GC5985@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <1381264659-11132-1-git-send-email-msalter@redhat.com>
On Tue, Oct 08, 2013 at 09:37:39PM +0100, Mark Salter wrote:
> The arm64 linker script doesn't use the PAGE_ALIGNED_DATA macro which
> leads to a ".data..page_aligned" section being placed between the end
> of .data and start of .bss:
>
> % readelf -e vmlinux
> ...
> Section to Segment mapping:
> Segment Sections...
> 00 .head.text .text .text.init .rodata __ksymtab __ksymtab_gpl \
> __ksymtab_strings __param __modver __ex_table .notes \
> .init.text .init.data .data..percpu .data .data..page_aligned .bss
>
> This causes problems for the EFI stub which may have to relocate the
> kernel image based on stext and _edata symbols.
>
> This patch adds PAGE_ALIGNED_DATA() to the linker script inside the
> the .data section.
>
> Signed-off-by: Mark Salter <msalter@redhat.com>
> ---
> arch/arm64/kernel/vmlinux.lds.S | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
> index f8ab9d8..e441556 100644
> --- a/arch/arm64/kernel/vmlinux.lds.S
> +++ b/arch/arm64/kernel/vmlinux.lds.S
> @@ -110,6 +110,7 @@ SECTIONS
> */
> INIT_TASK_DATA(THREAD_SIZE)
> NOSAVE_DATA
> + PAGE_ALIGNED_DATA(PAGE_SIZE)
> CACHELINE_ALIGNED_DATA(64)
> READ_MOSTLY_DATA(64)
Can we just replace this chunk with RW_DATA_SECTION(64, PAGE_SIZE,
THREAD_SIZE) instead?
Will
next prev parent reply other threads:[~2013-10-09 10:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-08 20:37 [PATCH] arm64: add PAGE_ALIGNED_DATA to linker script Mark Salter
2013-10-09 10:14 ` Will Deacon [this message]
2013-10-09 17:31 ` Mark Salter
2013-10-11 12:18 ` Mark Salter
2013-11-01 15:01 ` Mark Salter
2013-11-01 16:17 ` Will Deacon
2013-11-04 11:28 ` Catalin Marinas
2013-11-04 16:38 ` [PATCH] arm64: use generic RW_DATA_SECTION macro in " Mark Salter
2013-11-04 17:20 ` Will Deacon
2013-11-04 18:19 ` Catalin Marinas
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20131009101447.GC5985@mudshark.cambridge.arm.com \
--to=will.deacon@arm.com \
--cc=Catalin.Marinas@arm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=msalter@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox