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From: Ingo Molnar <mingo@kernel.org>
To: Huaixin Chang <changhuaixin@linux.alibaba.com>,
	Masahiro Yamada <masahiroy@kernel.org>
Cc: jpoimboe@redhat.com, bp@alien8.de, hpa@zytor.com,
	linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
	luto@amacapital.net, michal.lkml@markovi.net, mingo@redhat.com,
	peterz@infradead.org, tglx@linutronix.de, x86@kernel.org,
	yamada.masahiro@socionext.com
Subject: Re: [PATCH 1/3] scripts/sorttable: Change section type of orc_lookup to SHT_PROGBITS
Date: Fri, 24 Jul 2020 15:55:31 +0200	[thread overview]
Message-ID: <20200724135531.GB648324@gmail.com> (raw)
In-Reply-To: <20200723034643.33537-2-changhuaixin@linux.alibaba.com>


* Huaixin Chang <changhuaixin@linux.alibaba.com> wrote:

> In order to edit orc_lookup table via sorttable, type of section
> orc_lookup needs to be SHT_PROGBITS instead of SHT_NOBITS.
> 
> Linker script doesn't seem to allow manual specification of the section
> type, so just write a byte into the section instead.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
> Signed-off-by: Huaixin Chang <changhuaixin@linux.alibaba.com>
> Signed-off-by: Shile Zhang <shile.zhang@linux.alibaba.com>
> ---
>  include/asm-generic/vmlinux.lds.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index db600ef218d7..49f4f5bc6165 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -826,6 +826,8 @@
>  		. += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) /	\
>  			LOOKUP_BLOCK_SIZE) + 1) * 4;			\
>  		orc_lookup_end = .;					\
> +		/* HACK: force SHT_PROGBITS so sorttable can edit: */	\
> +		BYTE(1);						\

Cc:-ing Masahiro Yamada, maybe there's a cleaner solution to this?

Thanks,

	Ingo

  reply	other threads:[~2020-07-24 13:55 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-23  3:46 [PATCH RESEND 0/3] Build ORC fast lookup table in scripts/sorttable tool Huaixin Chang
2020-07-23  3:46 ` [PATCH 1/3] scripts/sorttable: Change section type of orc_lookup to SHT_PROGBITS Huaixin Chang
2020-07-24 13:55   ` Ingo Molnar [this message]
2020-08-04  1:40   ` changhuaixin
2020-08-06 15:08     ` Ingo Molnar
2020-08-07  4:22       ` changhuaixin
2020-07-23  3:46 ` [PATCH 2/3] scripts/sorttable: Build orc fast lookup table via sorttable tool Huaixin Chang
2020-07-24 13:53   ` Ingo Molnar
2020-07-27  2:19     ` changhuaixin
2020-07-23  3:46 ` [PATCH 3/3] x86/unwind/orc: Simplify unwind_init() for x86 boot Huaixin Chang
2020-08-07  4:17 ` [PATCH v2 0/3] Build ORC fast lookup table in scripts/sorttable tool Huaixin Chang
2020-08-07  4:18   ` [PATCH 1/3] objtool: Write .orc_lookup section header Huaixin Chang
2020-08-07  4:18   ` [PATCH 2/3] scripts/sorttable: Build ORC fast lookup table via sorttable tool Huaixin Chang
2020-08-07  4:18   ` [PATCH 3/3] x86/unwind/orc: Simplify unwind_init() for x86 boot Huaixin Chang
2020-08-19  3:03   ` [PATCH v2 0/3] Build ORC fast lookup table in scripts/sorttable tool changhuaixin
  -- strict thread matches above, loose matches on Subject: below --
2020-06-01 17:38 [PATCH 0/2] " Josh Poimboeuf
2020-06-03 14:31 ` [PATCH v2 0/3] " Huaixin Chang
2020-06-03 14:31   ` [PATCH 1/3] scripts/sorttable: Change section type of orc_lookup to SHT_PROGBITS Huaixin Chang
2020-06-03 14:39 ` [PATCH v3 0/3] Build ORC fast lookup table in scripts/sorttable tool Huaixin Chang
2020-06-03 14:39   ` [PATCH 1/3] scripts/sorttable: Change section type of orc_lookup to SHT_PROGBITS Huaixin Chang

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