diff mbox series

[04/15] ebpf-docs: Add Clang note about BPF_ALU

Message ID 20220927185958.14995-4-dthaler1968@googlemail.com (mailing list archive)
State Accepted
Commit ee159bdbdbce293e66d7b9249208f367faff5d81
Delegated to: BPF
Headers show
Series [01/15] ebpf-docs: Move legacy packet instructions to a separate file | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch
bpf/vmtest-bpf-next-VM_Test-4 success Logs for llvm-toolchain
bpf/vmtest-bpf-next-VM_Test-5 success Logs for set-matrix
bpf/vmtest-bpf-next-VM_Test-2 success Logs for build for x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-3 success Logs for build for x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-1 success Logs for build for s390x with gcc
bpf/vmtest-bpf-next-VM_Test-16 success Logs for test_verifier on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-13 success Logs for test_progs_no_alu32 on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-15 success Logs for test_verifier on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-17 success Logs for test_verifier on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-7 success Logs for test_maps on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-9 success Logs for test_progs on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-10 success Logs for test_progs on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-11 fail Logs for test_progs on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-12 success Logs for test_progs_no_alu32 on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-14 success Logs for test_progs_no_alu32 on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-8 success Logs for test_maps on x86_64 with llvm-16
bpf/vmtest-bpf-next-PR fail PR summary
bpf/vmtest-bpf-next-VM_Test-6 success Logs for test_maps on s390x with gcc

Commit Message

Dave Thaler Sept. 27, 2022, 6:59 p.m. UTC 
From: Dave Thaler <dthaler@microsoft.com>

Signed-off-by: Dave Thaler <dthaler@microsoft.com>
---
 Documentation/bpf/clang-notes.rst | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/bpf/clang-notes.rst b/Documentation/bpf/clang-notes.rst
index b15179cb5..528feddf2 100644
--- a/Documentation/bpf/clang-notes.rst
+++ b/Documentation/bpf/clang-notes.rst
@@ -14,6 +14,12 @@  Clang defined "CPU" versions, where a CPU version of 3 corresponds to the curren
 
 Clang can select the eBPF ISA version using ``-mcpu=v3`` for example to select version 3.
 
+Arithmetic instructions
+=======================
+
+For CPU versions prior to 3, Clang v7.0 and later can enable ``BPF_ALU`` support with
+``-Xclang -target-feature -Xclang +alu32``.  In CPU version 3, support is automatically included.
+
 Atomic operations
 =================