linux-kernel - Re: [PATCH 1/8] LoongArch: Add CONFIG_CC_HAS_EXPLICIT

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Message-ID: <CAAhV-H7-MNd9WsnB3r2kxRN7LveixGwQZ=qTVHB_XvW+uU9q4Q@mail.gmail.com>
Date:   Sun, 28 Aug 2022 22:15:34 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Xi Ruoyao <xry111@...111.site>
Cc:     loongarch@...ts.linux.dev, LKML <linux-kernel@...r.kernel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Youling Tang <tangyouling@...ngson.cn>,
        Jinyang He <hejinyang@...ngson.cn>
Subject: Re: [PATCH 1/8] LoongArch: Add CONFIG_CC_HAS_EXPLICIT_RELOCS

Hi, Ruoyao,

On Sun, Aug 28, 2022 at 1:55 AM Xi Ruoyao <xry111@...111.site> wrote:
>
> GNU as >= 2.40 and GCC >= 13 will support using explicit relocation
> hints in the assembly code, instead of la.* macros.  The usage of
> explicit relocation hints can improve code generation so it's enabled
> by default by GCC >= 13.  We need to adapt the kernel for this change,
> introduce CONFIG_CC_HAS_EXPLICIT_RELOCS so we can use it in later
> patches.
>
> Signed-off-by: Xi Ruoyao <xry111@...111.site>
> ---
>  arch/loongarch/Kconfig | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> index 810096bbf853..e7cfd451024b 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -203,6 +203,9 @@ config SCHED_OMIT_FRAME_POINTER
>         bool
>         default y
>
> +config CC_HAS_EXPLICIT_RELOCS
> +       def_bool $(cc-option,-mexplicit-relocs) && $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
Is it possible that we only change the Makefile and not touch Kconfig?



Huacai
> +
>  menu "Kernel type and options"
>
>  source "kernel/Kconfig.hz"
> --
> 2.37.0
>
>