linux-kernel - Re: [PATCH] powerpc/purgatory: Omit use of bin2c

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Message-ID: <CAK7LNAQChsc0uC_ZkxPz5qQ1bZOiK5g_uPhE8K859Ki9LAB=iw@mail.gmail.com>
Date:   Mon, 25 Jul 2022 00:12:05 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc/purgatory: Omit use of bin2c

On Sun, Jun 26, 2022 at 7:42 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> The .incbin assembler directive is much faster than bin2c + $(CC).
>
> Do similar refactoring as in commit 4c0f032d4963 ("s390/purgatory:
> Omit use of bin2c").
>
> Please note the .quad directive matches to size_t in C (both 8 byte)
> because the purgatory is compiled only for the 64-bit kernel.
> (KEXEC_FILE depends on PPC64).
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---


Ping?


>  arch/powerpc/Kconfig                     |  1 -
>  arch/powerpc/purgatory/.gitignore        |  1 -
>  arch/powerpc/purgatory/Makefile          |  8 ++------
>  arch/powerpc/purgatory/kexec-purgatory.S | 14 ++++++++++++++
>  scripts/remove-stale-files               |  2 ++
>  5 files changed, 18 insertions(+), 8 deletions(-)
>  create mode 100644 arch/powerpc/purgatory/kexec-purgatory.S
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index c2ce2e60c8f0..1cb684ee3519 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -547,7 +547,6 @@ config KEXEC_FILE
>         bool "kexec file based system call"
>         select KEXEC_CORE
>         select HAVE_IMA_KEXEC if IMA
> -       select BUILD_BIN2C
>         select KEXEC_ELF
>         depends on PPC64
>         depends on CRYPTO=y
> diff --git a/arch/powerpc/purgatory/.gitignore b/arch/powerpc/purgatory/.gitignore
> index b8dc6ff34254..5e40575c1f2b 100644
> --- a/arch/powerpc/purgatory/.gitignore
> +++ b/arch/powerpc/purgatory/.gitignore
> @@ -1,3 +1,2 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> -kexec-purgatory.c
>  purgatory.ro
> diff --git a/arch/powerpc/purgatory/Makefile b/arch/powerpc/purgatory/Makefile
> index 348f59581052..a81d155b89ae 100644
> --- a/arch/powerpc/purgatory/Makefile
> +++ b/arch/powerpc/purgatory/Makefile
> @@ -2,17 +2,13 @@
>
>  KASAN_SANITIZE := n
>
> -targets += trampoline_$(BITS).o purgatory.ro kexec-purgatory.c
> +targets += trampoline_$(BITS).o purgatory.ro
>
>  LDFLAGS_purgatory.ro := -e purgatory_start -r --no-undefined
>
>  $(obj)/purgatory.ro: $(obj)/trampoline_$(BITS).o FORCE
>                 $(call if_changed,ld)
>
> -quiet_cmd_bin2c = BIN2C   $@
> -      cmd_bin2c = $(objtree)/scripts/bin2c kexec_purgatory < $< > $@
> -
> -$(obj)/kexec-purgatory.c: $(obj)/purgatory.ro FORCE
> -       $(call if_changed,bin2c)
> +$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro
>
>  obj-y  += kexec-purgatory.o
> diff --git a/arch/powerpc/purgatory/kexec-purgatory.S b/arch/powerpc/purgatory/kexec-purgatory.S
> new file mode 100644
> index 000000000000..4e5f64a0bf4a
> --- /dev/null
> +++ b/arch/powerpc/purgatory/kexec-purgatory.S
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +       .section .rodata, "a"
> +
> +       .align  8
> +kexec_purgatory:
> +       .globl  kexec_purgatory
> +       .incbin "arch/powerpc/purgatory/purgatory.ro"
> +.Lkexec_purgatroy_end:
> +
> +       .align  8
> +kexec_purgatory_size:
> +       .globl  kexec_purgatory_size
> +       .quad   .Lkexec_purgatroy_end - kexec_purgatory
> diff --git a/scripts/remove-stale-files b/scripts/remove-stale-files
> index 7adab4618035..5a7543469698 100755
> --- a/scripts/remove-stale-files
> +++ b/scripts/remove-stale-files
> @@ -20,6 +20,8 @@ set -e
>  # yard. Stale files stay in this file for a while (for some release cycles?),
>  # then will be really dead and removed from the code base entirely.
>
> +rm -f arch/powerpc/purgatory/kexec-purgatory.c
> +
>  # These were previously generated source files. When you are building the kernel
>  # with O=, make sure to remove the stale files in the output tree. Otherwise,
>  # the build system wrongly compiles the stale ones.
> --
> 2.32.0
>


-- 
Best Regards
Masahiro Yamada