The initial purpose of this series is to cleanup the unused bpf map 'syscalls' in the eBPF program augmented_raw_syscalls and perf trace tool. The relality is perf trace tool initializes system call table based on map 'syscalls' and wrongly returns syscall pointer for non-existed system calls based on the previous initialization. So the patch set firstly addresses the issue for handling non-existed system calls, then it removes unused local variable and bpf map in augmented_raw_syscalls.c. Patch 01 is a minor refactoring to use macro to replace number, patch 02 is to return error if a system call doesn't exist, especially when we cannot find corresponding trace point in sysfs node, patch 03 is to fix the issue that trace__syscall_info() returns a syscall pointer even the system call doesn't exist, the corrected result is to always return NULL pointer for non-existed system call. The last two patches remove the unused local variable and bpf map 'syscalls'. This patch set has been tested with mainline kernel on Arm64 Ampere Altra platform. Leo Yan (5): perf trace: Use macro RAW_SYSCALL_ARGS_NUM to replace number perf trace: Return error if a system call doesn't exist perf trace: Handle failure when trace point folder is missed perf augmented_raw_syscalls: Remove unused variable 'syscall' perf trace: Remove unused bpf map 'syscalls' tools/perf/builtin-trace.c | 131 +++--------------- .../examples/bpf/augmented_raw_syscalls.c | 18 --- 2 files changed, 18 insertions(+), 131 deletions(-) -- 2.34.1
