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docs: Correct subject prefix and update LLVM info

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bpf_devel_QA.rst:152 The subject prefix information is not accurate, it
should be 'PATCH bpf-next v2'

Also update LLVM version info and add information about
‘-DLLVM_TARGETS_TO_BUILD’ to prompt the developer to build the desired
target.

Signed-off-by: Jianlin Lv <Jianlin.Lv@arm.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200821052817.46887-1-Jianlin.Lv@arm.com
This commit is contained in:
Jianlin Lv 2020-08-21 13:28:17 +08:00 committed by Alexei Starovoitov
parent 890f4365e4
commit 4d0d167341
1 changed files with 12 additions and 7 deletions
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Documentation/bpf/bpf_devel_QA.rst
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@ -149,7 +149,7 @@ In case the patch or patch series has to be reworked and sent out
again in a second or later revision, it is also required to add a again in a second or later revision, it is also required to add a
version number (``v2``, ``v3``, ...) into the subject prefix:: version number (``v2``, ``v3``, ...) into the subject prefix::
git format-patch --subject-prefix='PATCH net-next v2' start..finish git format-patch --subject-prefix='PATCH bpf-next v2' start..finish
When changes have been requested to the patch series, always send the When changes have been requested to the patch series, always send the
whole patch series again with the feedback incorporated (never send whole patch series again with the feedback incorporated (never send
@ -479,17 +479,18 @@ LLVM's static compiler lists the supported targets through
$ llc --version $ llc --version
LLVM (http://llvm.org/): LLVM (http://llvm.org/):
LLVM version 6.0.0svn LLVM version 10.0.0
Optimized build. Optimized build.
Default target: x86_64-unknown-linux-gnu Default target: x86_64-unknown-linux-gnu
Host CPU: skylake Host CPU: skylake
Registered Targets: Registered Targets:
bpf - BPF (host endian) aarch64 - AArch64 (little endian)
bpfeb - BPF (big endian) bpf - BPF (host endian)
bpfel - BPF (little endian) bpfeb - BPF (big endian)
x86 - 32-bit X86: Pentium-Pro and above bpfel - BPF (little endian)
x86-64 - 64-bit X86: EM64T and AMD64 x86 - 32-bit X86: Pentium-Pro and above
x86-64 - 64-bit X86: EM64T and AMD64
For developers in order to utilize the latest features added to LLVM's For developers in order to utilize the latest features added to LLVM's
BPF back end, it is advisable to run the latest LLVM releases. Support BPF back end, it is advisable to run the latest LLVM releases. Support
@ -517,6 +518,10 @@ from the git repositories::
The built binaries can then be found in the build/bin/ directory, where The built binaries can then be found in the build/bin/ directory, where
you can point the PATH variable to. you can point the PATH variable to.
Set ``-DLLVM_TARGETS_TO_BUILD`` equal to the target you wish to build, you
will find a full list of targets within the llvm-project/llvm/lib/Target
directory.
Q: Reporting LLVM BPF issues Q: Reporting LLVM BPF issues
---------------------------- ----------------------------
Q: Should I notify BPF kernel maintainers about issues in LLVM's BPF code Q: Should I notify BPF kernel maintainers about issues in LLVM's BPF code