Hou Tao ee3d37d796 bpf, perf: Use subprog name when reporting subprog ksymbol ... [ Upstream commit 47df8a2f78 ] Since commit bfea9a8574 ("bpf: Add name to struct bpf_ksym"), when reporting subprog ksymbol to perf, prog name instead of subprog name is used. The backtrace of bpf program with subprogs will be incorrect as shown below: ffffffffc02deace bpf_prog_e44a3057dcb151f8_overwrite+0x66 ffffffffc02de9f7 bpf_prog_e44a3057dcb151f8_overwrite+0x9f ffffffffa71d8d4e trace_call_bpf+0xce ffffffffa71c2938 perf_call_bpf_enter.isra.0+0x48 overwrite is the entry program and it invokes the overwrite_htab subprog through bpf_loop, but in above backtrace, overwrite program just jumps inside itself. Fixing it by using subprog name when reporting subprog ksymbol. After the fix, the output of perf script will be correct as shown below: ffffffffc031aad2 bpf_prog_37c0bec7d7c764a4_overwrite_htab+0x66 ffffffffc031a9e7 bpf_prog_c7eb827ef4f23e71_overwrite+0x9f ffffffffa3dd8d4e trace_call_bpf+0xce ffffffffa3dc2938 perf_call_bpf_enter.isra.0+0x48 Fixes: bfea9a8574 ("bpf: Add name to struct bpf_ksym") Signed-off-by: Hou Tao <houtao1@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/bpf/20221114095733.158588-1-houtao@huaweicloud.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-12-08 11:28:38 +01:00
..
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
callchain.c	uaccess: add force_uaccess_{begin,end} helpers	2020-08-12 10:57:59 -07:00
core.c	bpf, perf: Use subprog name when reporting subprog ksymbol	2022-12-08 11:28:38 +01:00
hw_breakpoint.c	perf/hw_breakpoint: Replace deprecated CPU-hotplug functions	2021-08-26 09:14:36 +02:00
internal.h	perf/core: Fix perf_mmap fail when CONFIG_PERF_USE_VMALLOC enabled	2022-04-27 14:38:58 +02:00
ring_buffer.c	perf: Fix missing SIGTRAPs	2022-11-03 23:59:15 +09:00
uprobes.c	Merge branch 'akpm' (patches from Andrew)	2021-06-29 17:29:11 -07:00