All of lore.kernel.org
 help / color / mirror / Atom feed
From: Nick Desaulniers <ndesaulniers@google.com>
To: Fangrui Song <maskray@google.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	 Albert Ou <aou@eecs.berkeley.edu>,
	linux-riscv@lists.infradead.org,  Khem Raj <raj.khem@gmail.com>,
	linux-kernel@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [PATCH] riscv: Pass -mno-relax only on lld < 15.0.0
Date: Mon, 11 Jul 2022 10:38:25 -0700	[thread overview]
Message-ID: <CAKwvOd=yTio6SDG-dEEB1W3nQdZZNk67x_DsiedmC5t95P8XNg@mail.gmail.com> (raw)
In-Reply-To: <20220710071117.446112-1-maskray@google.com>

On Sun, Jul 10, 2022 at 12:11 AM Fangrui Song <maskray@google.com> wrote:
>
> lld since
> https://github.com/llvm/llvm-project/commit/6611d58f5bbcbec77262d392e2923e1d680f6985
> (milestone: 15.0.0) has implemented some RISC-V linker relaxation.
> -mno-relax is no longer needed in KBUILD_CFLAGS/KBUILD_AFLAGS to
> suppress R_RISCV_ALIGN which older lld can not handle:
>
> ld.lld: error: capability.c:(.fixup+0x0): relocation R_RISCV_ALIGN requires unimplemented linker relaxation; recompile with -mno-relax but the .o is already compiled with -mno-relax
>
> Signed-off-by: Fangrui Song <maskray@google.com>

Thanks for implementing relaxation in LLD for RISC-V!

Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>

> ---
>  arch/riscv/Makefile | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
> index 34cf8a598617..7e4ceb2a0981 100644
> --- a/arch/riscv/Makefile
> +++ b/arch/riscv/Makefile
> @@ -37,6 +37,7 @@ else
>  endif
>
>  ifeq ($(CONFIG_LD_IS_LLD),y)
> +ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
>         KBUILD_CFLAGS += -mno-relax
>         KBUILD_AFLAGS += -mno-relax
>  ifndef CONFIG_AS_IS_LLVM
> @@ -44,6 +45,7 @@ ifndef CONFIG_AS_IS_LLVM
>         KBUILD_AFLAGS += -Wa,-mno-relax
>  endif
>  endif
> +endif
>
>  # ISA string setting
>  riscv-march-$(CONFIG_ARCH_RV32I)       := rv32ima
> --
> 2.37.0.144.g8ac04bfd2-goog
>
>


-- 
Thanks,
~Nick Desaulniers

WARNING: multiple messages have this Message-ID (diff)
From: Nick Desaulniers <ndesaulniers@google.com>
To: Fangrui Song <maskray@google.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	 Albert Ou <aou@eecs.berkeley.edu>,
	linux-riscv@lists.infradead.org,  Khem Raj <raj.khem@gmail.com>,
	linux-kernel@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [PATCH] riscv: Pass -mno-relax only on lld < 15.0.0
Date: Mon, 11 Jul 2022 10:38:25 -0700	[thread overview]
Message-ID: <CAKwvOd=yTio6SDG-dEEB1W3nQdZZNk67x_DsiedmC5t95P8XNg@mail.gmail.com> (raw)
In-Reply-To: <20220710071117.446112-1-maskray@google.com>

On Sun, Jul 10, 2022 at 12:11 AM Fangrui Song <maskray@google.com> wrote:
>
> lld since
> https://github.com/llvm/llvm-project/commit/6611d58f5bbcbec77262d392e2923e1d680f6985
> (milestone: 15.0.0) has implemented some RISC-V linker relaxation.
> -mno-relax is no longer needed in KBUILD_CFLAGS/KBUILD_AFLAGS to
> suppress R_RISCV_ALIGN which older lld can not handle:
>
> ld.lld: error: capability.c:(.fixup+0x0): relocation R_RISCV_ALIGN requires unimplemented linker relaxation; recompile with -mno-relax but the .o is already compiled with -mno-relax
>
> Signed-off-by: Fangrui Song <maskray@google.com>

Thanks for implementing relaxation in LLD for RISC-V!

Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>

> ---
>  arch/riscv/Makefile | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
> index 34cf8a598617..7e4ceb2a0981 100644
> --- a/arch/riscv/Makefile
> +++ b/arch/riscv/Makefile
> @@ -37,6 +37,7 @@ else
>  endif
>
>  ifeq ($(CONFIG_LD_IS_LLD),y)
> +ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
>         KBUILD_CFLAGS += -mno-relax
>         KBUILD_AFLAGS += -mno-relax
>  ifndef CONFIG_AS_IS_LLVM
> @@ -44,6 +45,7 @@ ifndef CONFIG_AS_IS_LLVM
>         KBUILD_AFLAGS += -Wa,-mno-relax
>  endif
>  endif
> +endif
>
>  # ISA string setting
>  riscv-march-$(CONFIG_ARCH_RV32I)       := rv32ima
> --
> 2.37.0.144.g8ac04bfd2-goog
>
>


-- 
Thanks,
~Nick Desaulniers

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

  parent reply	other threads:[~2022-07-11 17:38 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-10  7:11 [PATCH] riscv: Pass -mno-relax only on lld < 15.0.0 Fangrui Song
2022-07-10  7:11 ` Fangrui Song
2022-07-11 17:36 ` Nathan Chancellor
2022-07-11 17:36   ` Nathan Chancellor
2022-07-11 17:38 ` Nick Desaulniers [this message]
2022-07-11 17:38   ` Nick Desaulniers
2022-09-08 17:18 ` Nathan Chancellor
2022-09-08 17:18   ` Nathan Chancellor
2022-07-13  4:16 kernel test robot
2022-07-13  5:48 ` Fangrui Song
2022-07-13  5:48   ` Fangrui Song
2022-07-13  7:19   ` Fangrui Song
2022-07-13  7:19     ` Fangrui Song

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='CAKwvOd=yTio6SDG-dEEB1W3nQdZZNk67x_DsiedmC5t95P8XNg@mail.gmail.com' \
    --to=ndesaulniers@google.com \
    --cc=aou@eecs.berkeley.edu \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-riscv@lists.infradead.org \
    --cc=llvm@lists.linux.dev \
    --cc=maskray@google.com \
    --cc=palmer@dabbelt.com \
    --cc=paul.walmsley@sifive.com \
    --cc=raj.khem@gmail.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.