All of lore.kernel.org
 help / color / mirror / Atom feed
From: Ard Biesheuvel <ardb@kernel.org>
To: Nathan Chancellor <nathan@kernel.org>, Arnd Bergmann <arnd@arndb.de>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
	 Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	 Mark Rutland <mark.rutland@arm.com>,
	llvm@lists.linux.dev
Subject: Re: [PATCH v2] arm64/xor: use EOR3 instructions when available
Date: Tue, 14 Dec 2021 09:19:57 +0100	[thread overview]
Message-ID: <CAMj1kXFKuHuzsrDBcUjbaVO6-NQkj8J+vMty_qU3Y0pDwT905w@mail.gmail.com> (raw)
In-Reply-To: <YbgDR461O9gCEi+Q@archlinux-ax161>

+ Arnd

On Tue, 14 Dec 2021 at 03:37, Nathan Chancellor <nathan@kernel.org> wrote:
>
> Hi Ard,
>
> On Mon, Dec 13, 2021 at 03:02:52PM +0100, Ard Biesheuvel wrote:
> > Use the EOR3 instruction to implement xor_blocks() if the instruction is
> > available, which is the case if the CPU implements the SHA-3 extension.
> > This is about 20% faster on Apple M1 when using the 5-way version.
> >
> > Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
>
> Our CI reported that this patch as commit ce9ba49a2460 ("arm64/xor: use
> EOR3 instructions when available") in the arm64 tree breaks
> allyesconfig:
>
> https://github.com/ClangBuiltLinux/continuous-integration2/runs/4514540083?check_suite_focus=true
>
> I also see this when building with GCC 11.2.0:
>
> WARNING: modpost: EXPORT symbol "xor_block_inner_neon" [vmlinux] version ...
> Is "xor_block_inner_neon" prototyped in <asm/asm-prototypes.h>?
> aarch64-linux-gnu-ld: arch/arm64/lib/xor-neon.o: relocation R_AARCH64_ABS32 against `__crc_xor_block_inner_neon' can not be used when making a shared object

I suspect this is another genksyms crash, preventing the
__crc_xor_block_inner_neon symbol from ever being emitted.

This is a recurring annoyance and I am not sure how to address this
properly. Arnd might have some thoughts on the matter as well.


> arch/arm64/lib/xor-neon.o:(.data+0x0): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data+0x18): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data+0x20): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x0): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x8): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x10): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x18): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x20): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x28): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x30): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x38): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x40): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x48): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.fini_array+0x0): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.init_array+0x0): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data..ro_after_init+0x8): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data..ro_after_init+0x18): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data..ro_after_init+0x20): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data..ro_after_init+0x28): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data..ro_after_init+0x30): dangerous relocation: unsupported relocation
>
> Cheers,
> Nathan

WARNING: multiple messages have this Message-ID (diff)
From: Ard Biesheuvel <ardb@kernel.org>
To: Nathan Chancellor <nathan@kernel.org>, Arnd Bergmann <arnd@arndb.de>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
	 Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	 Mark Rutland <mark.rutland@arm.com>,
	llvm@lists.linux.dev
Subject: Re: [PATCH v2] arm64/xor: use EOR3 instructions when available
Date: Tue, 14 Dec 2021 09:19:57 +0100	[thread overview]
Message-ID: <CAMj1kXFKuHuzsrDBcUjbaVO6-NQkj8J+vMty_qU3Y0pDwT905w@mail.gmail.com> (raw)
In-Reply-To: <YbgDR461O9gCEi+Q@archlinux-ax161>

+ Arnd

On Tue, 14 Dec 2021 at 03:37, Nathan Chancellor <nathan@kernel.org> wrote:
>
> Hi Ard,
>
> On Mon, Dec 13, 2021 at 03:02:52PM +0100, Ard Biesheuvel wrote:
> > Use the EOR3 instruction to implement xor_blocks() if the instruction is
> > available, which is the case if the CPU implements the SHA-3 extension.
> > This is about 20% faster on Apple M1 when using the 5-way version.
> >
> > Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
>
> Our CI reported that this patch as commit ce9ba49a2460 ("arm64/xor: use
> EOR3 instructions when available") in the arm64 tree breaks
> allyesconfig:
>
> https://github.com/ClangBuiltLinux/continuous-integration2/runs/4514540083?check_suite_focus=true
>
> I also see this when building with GCC 11.2.0:
>
> WARNING: modpost: EXPORT symbol "xor_block_inner_neon" [vmlinux] version ...
> Is "xor_block_inner_neon" prototyped in <asm/asm-prototypes.h>?
> aarch64-linux-gnu-ld: arch/arm64/lib/xor-neon.o: relocation R_AARCH64_ABS32 against `__crc_xor_block_inner_neon' can not be used when making a shared object

I suspect this is another genksyms crash, preventing the
__crc_xor_block_inner_neon symbol from ever being emitted.

This is a recurring annoyance and I am not sure how to address this
properly. Arnd might have some thoughts on the matter as well.


> arch/arm64/lib/xor-neon.o:(.data+0x0): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data+0x18): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data+0x20): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x0): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x8): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x10): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x18): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x20): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x28): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x30): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x38): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x40): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(__patchable_function_entries+0x48): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.fini_array+0x0): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.init_array+0x0): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data..ro_after_init+0x8): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data..ro_after_init+0x18): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data..ro_after_init+0x20): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data..ro_after_init+0x28): dangerous relocation: unsupported relocation
> arch/arm64/lib/xor-neon.o:(.data..ro_after_init+0x30): dangerous relocation: unsupported relocation
>
> Cheers,
> Nathan

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

  reply	other threads:[~2021-12-14  8:20 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-13 14:02 [PATCH v2] arm64/xor: use EOR3 instructions when available Ard Biesheuvel
2021-12-13 19:19 ` Catalin Marinas
2021-12-14  2:36 ` Nathan Chancellor
2021-12-14  2:36   ` Nathan Chancellor
2021-12-14  8:19   ` Ard Biesheuvel [this message]
2021-12-14  8:19     ` Ard Biesheuvel
2021-12-14 11:05     ` Ard Biesheuvel
2021-12-14 11:05       ` Ard Biesheuvel
2021-12-14 11:36       ` Catalin Marinas
2021-12-14 11:36         ` Catalin Marinas
2021-12-14 12:57         ` Ard Biesheuvel
2021-12-14 12:57           ` Ard Biesheuvel
2021-12-15 15:15           ` Catalin Marinas
2021-12-15 15:15             ` Catalin Marinas

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=CAMj1kXFKuHuzsrDBcUjbaVO6-NQkj8J+vMty_qU3Y0pDwT905w@mail.gmail.com \
    --to=ardb@kernel.org \
    --cc=arnd@arndb.de \
    --cc=catalin.marinas@arm.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=llvm@lists.linux.dev \
    --cc=mark.rutland@arm.com \
    --cc=nathan@kernel.org \
    --cc=will@kernel.org \
    /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.