linux-kernel - Re: [PATCH] arm64/module: use mod->klp

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Message-ID: <alpine.LSU.2.21.1810241341580.20865@pobox.suse.cz>
Date:   Wed, 24 Oct 2018 13:57:24 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Jessica Yu <jeyu@...nel.org>
cc:     Torsten Duwe <duwe@....de>, Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Julien Thierry <julien.thierry@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        live-patching@...r.kernel.org
Subject: Re: [PATCH] arm64/module: use mod->klp_info section header
 information

On Tue, 23 Oct 2018, Jessica Yu wrote:

> diff --git a/arch/arm64/kernel/module-plts.c b/arch/arm64/kernel/module-plts.c
> index f0690c2ca3e0..05067717dfc5 100644
> --- a/arch/arm64/kernel/module-plts.c
> +++ b/arch/arm64/kernel/module-plts.c
> @@ -210,9 +210,15 @@ int module_frob_arch_sections(Elf_Ehdr *ehdr, Elf_Shdr
> *sechdrs,
> 	 * entries. Record the symtab address as well.
> 	 */
> 	for (i = 0; i < ehdr->e_shnum; i++) {
> -		if (!strcmp(secstrings + sechdrs[i].sh_name, ".plt"))
> +		if (!strcmp(secstrings + sechdrs[i].sh_name, ".plt")) {
> 			mod->arch.core.plt = sechdrs + i;
> -		else if (!strcmp(secstrings + sechdrs[i].sh_name,
> ".init.plt"))
> +			/*
> +			 * Keep the section index for the .plt section for
> +			 * livepatching. Note that .init.plt is irrelevant to
> +			 * livepatch, so only the shndx for .plt is saved.
> +			 */
> +			mod->arch.core.plt_shndx = i;
> +		} else if (!strcmp(secstrings + sechdrs[i].sh_name,
> ".init.plt"))

Else branches should have braces now too according to the coding style.

Otherwise it looks good to me.

Thanks,
Miroslav