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Nick Terrell c284569457 [asm] Share portability macros and restrict ASM further 
Move portability macros to `lib/common/portability_macros.h`. This file
only contains platform/feature detection (e.g. 0/1 macros). This file is
shared between C and ASM code, so it cannot include any C code.

Rename `HUF_` ASM macros to be `ZSTD_` prefixed, and move to the new
header.

Restrict `ZSTD_ASM_SUPPORTED` to `__GNUC__`, because we need the GAS
assembler.

Finally, only include the ASM code if we are actually going to use it.
This disables it on all Windows platforms, which should resolve the
problem brought up in Issue #2789.
2021-12-02 16:58:04 -08:00
..
test
[linux-kernel] Don't inline function in zstd_opt.c
2021-11-15 20:37:30 -08:00
.gitignore
fix gitignore
2017-04-04 18:15:21 -07:00
btrfs-benchmark.sh
Add BtrFS benchmarks
2017-04-11 12:40:53 -07:00
btrfs-extract-benchmark.sh
[linux] Write all the patch summaries
2017-06-21 20:23:44 -07:00
decompress_sources.h
[asm] Share portability macros and restrict ASM further
2021-12-02 16:58:04 -08:00
linux_zstd.h
[contrib][linux] Fix up SPDX license identifiers
2021-09-22 15:09:42 -07:00
linux.mk
[linux-kernel] Don't add -O3 to CFLAGS
2021-11-16 15:42:36 -08:00
Makefile
[linux-kernel] Don't inline function in zstd_opt.c
2021-11-15 20:37:30 -08:00
mem.h
[contrib][linux] Fix up SPDX license identifiers
2021-09-22 15:09:42 -07:00
README.md
[linux-kernel] Update README with initial instructions on how to update zstd in the kernel
2020-09-09 14:36:22 -07:00
squashfs-benchmark.sh
[kernel] Update README with SquashFS patch
2017-05-03 11:07:39 -07:00
zstd_compress_module.c
[contrib][linux] Reduce stack usage by 80 bytes
2021-09-22 18:18:47 -07:00
zstd_decompress_module.c
[contrib][linux] Fix up SPDX license identifiers
2021-09-22 15:09:42 -07:00
zstd_deps.h
[contrib][linux] Fix up SPDX license identifiers
2021-09-22 15:09:42 -07:00

README.md

Zstd in the Linux Kernel

This directory contains the scripts needed to transform upstream zstd into the version imported into the kernel. All the transforms are automated and tested by our continuous integration.

Upgrading Zstd in the Linux Kernel

  1. cd into this directory.
  2. Run make libzstd and read the output. Make sure that all the diffs printed and changes made by the script are correct.
  3. Run make test and ensure that it passes.
  4. Import zstd into the Linux Kernel make import LINUX=/path/to/linux/repo
  5. Inspect the diff for sanity.
  6. Check the Linux Kernel history for zstd. If any patches were made to the kernel version of zstd, but not to upstream zstd, then port them upstream if necessary.
  7. Test the diff. Benchmark if necessary. Make sure to test multiple architectures: At least x86, i386, and arm.
  8. Submit the patch to the LKML.
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