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From: Andrew Cooper <Andrew.Cooper3@citrix.com>
To: Roger Pau Monne <roger.pau@citrix.com>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: George Dunlap <George.Dunlap@citrix.com>,
	Jan Beulich <jbeulich@suse.com>, Julien Grall <julien@xen.org>,
	Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>,
	Bertrand Marquis <bertrand.marquis@arm.com>,
	"Volodymyr Babchuk" <Volodymyr_Babchuk@epam.com>
Subject: Re: [PATCH] livepatch: set -f{function,data}-sections compiler option
Date: Wed, 2 Mar 2022 15:35:07 +0000	[thread overview]
Message-ID: <b2381496-4dc5-5051-2bf5-9d164041c9c8@citrix.com> (raw)
In-Reply-To: <20220302134425.38465-1-roger.pau@citrix.com>

On 02/03/2022 13:44, Roger Pau Monne wrote:
> diff --git a/xen/common/Kconfig b/xen/common/Kconfig
> index 6443943889..2423d9f490 100644
> --- a/xen/common/Kconfig
> +++ b/xen/common/Kconfig
> @@ -353,7 +353,9 @@ config CRYPTO
>  config LIVEPATCH
>  	bool "Live patching support"
>  	default X86
> -	depends on "$(XEN_HAS_BUILD_ID)" = "y"
> +	depends on "$(XEN_HAS_BUILD_ID)" = "y" && \
> +	           $(cc-option,-ffunction-sections) && \
> +	           $(cc-option,-fdata-sections)

cc-option can take multiple, so just $(cc-option,-ffunction-sections
-fdata-sections)

However, we in practice want these in combination with $(LD)
--gc-sections anyway although that wants to be separately configurable.

Therefore, we probably want something like:

config FUNC_SECTIONS
    bool

config LIVEPATCH
    selects FUNC_SECTIONS

or so, so in the future we can add "config LD_GC_SECTIONS" which also
selects FUNC_SECTIONS.

Thoughts?

~Andrew

  parent reply	other threads:[~2022-03-02 15:35 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-02 13:44 [PATCH] livepatch: set -f{function,data}-sections compiler option Roger Pau Monne
2022-03-02 14:41 ` Jan Beulich
2022-03-02 15:46   ` Roger Pau Monné
2022-03-02 16:09     ` Jan Beulich
2022-03-02 16:20       ` Roger Pau Monné
2022-03-02 16:13   ` Jan Beulich
2022-03-02 15:35 ` Andrew Cooper [this message]
2022-03-02 16:13   ` Roger Pau Monné

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