mirror of
git://git.yoctoproject.org/linux-yocto.git
synced 2025-10-22 23:13:01 +02:00
214093534f
try_cmpxchg() loop with constant "new" value can be substituted
with just xchg() to atomically get and clear the location.
The code on x86_64 improves from:
1e7f: 48 89 4c 24 10 mov %rcx,0x10(%rsp)
1e84: 48 03 14 c5 00 00 00 add 0x0(,%rax,8),%rdx
1e8b: 00
1e88: R_X86_64_32S __per_cpu_offset
1e8c: 8b 02 mov (%rdx),%eax
1e8e: 41 89 c5 mov %eax,%r13d
1e91: 31 c9 xor %ecx,%ecx
1e93: f0 0f b1 0a lock cmpxchg %ecx,(%rdx)
1e97: 75 f5 jne 1e8e <xlog_cil_commit+0x84e>
1e99: 48 8b 4c 24 10 mov 0x10(%rsp),%rcx
1e9e: 45 01 e9 add %r13d,%r9d
to just:
1e7f: 48 03 14 cd 00 00 00 add 0x0(,%rcx,8),%rdx
1e86: 00
1e83: R_X86_64_32S __per_cpu_offset
1e87: 31 c9 xor %ecx,%ecx
1e89: 87 0a xchg %ecx,(%rdx)
1e8b: 41 01 cb add %ecx,%r11d
No functional change intended.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Chandan Babu R <chandan.babu@oracle.com>
Cc: Darrick J. Wong <djwong@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Alex Elder <elder@riscstar.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first.
In order to build the documentation, use make htmldocs or
make pdfdocs. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory, several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.