diff options
Diffstat (limited to 'kernel/bpf/core.c')
| -rw-r--r-- | kernel/bpf/core.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index aa1e64196d8d..3a283bf97f2f 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -2344,6 +2344,10 @@ bool __weak bpf_helper_changes_pkt_data(void *func) /* Return TRUE if the JIT backend wants verifier to enable sub-register usage * analysis code and wants explicit zero extension inserted by verifier. * Otherwise, return FALSE. + * + * The verifier inserts an explicit zero extension after BPF_CMPXCHGs even if + * you don't override this. JITs that don't want these extra insns can detect + * them using insn_is_zext. */ bool __weak bpf_jit_needs_zext(void) { |