From: Arvind Sankar <nivedita@alum.mit.edu>
To: Nick Terrell <terrelln@fb.com>
Cc: Arvind Sankar <nivedita@alum.mit.edu>,
Nick Terrell <nickrterrell@gmail.com>,
Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel <linux-kernel@vger.kernel.org>,
Chris Mason <clm@fb.com>,
"linux-kbuild@vger.kernel.org" <linux-kbuild@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
Petr Malat <oss@malat.biz>, Kees Cook <keescook@chromium.org>,
Kernel Team <Kernel-team@fb.com>,
Adam Borowski <kilobyte@angband.pl>,
Patrick Williams <patrickw3@fb.com>,
Michael van der Westhuizen <rmikey@fb.com>,
"mingo@kernel.org" <mingo@kernel.org>,
Patrick Williams <patrick@stwcx.xyz>,
Sedat Dilek <sedat.dilek@gmail.com>,
Norbert Lange <nolange79@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v6 4/8] init: add support for zstd compressed kernel
Date: Tue, 7 Jul 2020 23:09:39 -0400 [thread overview]
Message-ID: <20200708030939.GA1847378@rani.riverdale.lan> (raw)
In-Reply-To: <BFD3E8B0-4BAA-4E3A-AF16-FB17E88BECFE@fb.com>
On Wed, Jul 08, 2020 at 02:01:50AM +0000, Nick Terrell wrote:
>
>
> > On Jul 7, 2020, at 6:11 PM, Arvind Sankar <nivedita@alum.mit.edu> wrote:
> >
> > On Mon, Jul 06, 2020 at 08:46:00PM -0700, Nick Terrell wrote:
> >> From: Nick Terrell <terrelln@fb.com>
> >>
> >> * Adds the zstd cmd to scripts/Makefile.lib
> >> * Adds the HAVE_KERNEL_ZSTD and KERNEL_ZSTD options
> >>
> >> Architecture specific support is still needed for decompression.
> >>
> >> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> >> index 916b2f7f7098..d960f8815f87 100644
> >> --- a/scripts/Makefile.lib
> >> +++ b/scripts/Makefile.lib
> >> @@ -413,6 +413,21 @@ quiet_cmd_xzkern = XZKERN $@
> >> quiet_cmd_xzmisc = XZMISC $@
> >> cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
> >>
> >> +# ZSTD
> >> +# ---------------------------------------------------------------------------
> >> +# Appends the uncompressed size of the data using size_append. The .zst
> >> +# format has the size information available at the beginning of the file too,
> >> +# but it's in a more complex format and it's good to avoid changing the part
> >> +# of the boot code that reads the uncompressed size.
> >> +# Note that the bytes added by size_append will make the zstd tool think that
> >> +# the file is corrupt. This is expected.
> >> +
> >> +quiet_cmd_zstd = ZSTD $@
> >> +cmd_zstd = (cat $(filter-out FORCE,$^) | \
> > ^^ should just be $(real-prereqs)
> >> + zstd -19 && \
> >> + $(call size_append, $(filter-out FORCE,$^))) > $@ || \
> > ^^ size_append does not take arguments. It's used as just
> > $(size_append) and will always output shell code to print the
> > total size of $(real-prereqs) -- see other compressor command
> > definitions.
>
> Yeah, when I wrote this code, this was how the rest of the compressors were implemented.
> I noticed that they had all been updated when I was responding to Norbert Lange earlier.
> I will submit a v7 shortly with the updated command.
>
> Thanks for the review,
> Nick
>
>
Looks like it changed in 5.1. I guess this patch has been floating
around for quite some time :) Here's hoping v8 is the last one!
next prev parent reply other threads:[~2020-07-08 3:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-07 3:45 [GIT PULL][PATCH v6 0/8] Add support for ZSTD-compressed kernel and initramfs Nick Terrell
2020-07-07 3:45 ` [PATCH v6 1/8] lib: prepare zstd for preboot environment Nick Terrell
2020-07-07 3:45 ` [PATCH v6 2/8] lib: prepare xxhash " Nick Terrell
2020-07-07 21:59 ` Arvind Sankar
2020-07-08 2:03 ` Nick Terrell
2020-07-08 2:49 ` Kees Cook
2020-07-08 3:23 ` Arvind Sankar
2020-07-07 3:45 ` [PATCH v6 3/8] lib: add zstd support to decompress Nick Terrell
2020-07-07 3:46 ` [PATCH v6 4/8] init: add support for zstd compressed kernel Nick Terrell
2020-07-07 7:19 ` Norbert Lange
2020-07-07 15:31 ` Nick Terrell
2020-07-07 16:40 ` Norbert Lange
2020-07-07 22:11 ` Arvind Sankar
2020-07-08 2:01 ` Nick Terrell
2020-07-08 3:09 ` Arvind Sankar [this message]
2020-07-08 3:25 ` Arvind Sankar
2020-07-07 3:46 ` [PATCH v6 5/8] usr: add support for zstd compressed initramfs Nick Terrell
2020-07-07 3:46 ` [PATCH v6 6/8] x86: bump ZO_z_extra_bytes margin for zstd Nick Terrell
2020-07-07 3:46 ` [PATCH v6 7/8] x86: Add support for ZSTD compressed kernel Nick Terrell
2020-07-07 3:46 ` [PATCH v6 8/8] .gitignore: add ZSTD-compressed files Nick Terrell
2020-07-07 4:03 ` [GIT PULL][PATCH v6 0/8] Add support for ZSTD-compressed kernel and initramfs Sedat Dilek
2020-07-07 9:01 ` Sedat Dilek
2020-07-07 21:32 ` Kees Cook
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