user/sven/linux.git/samples/bpf/task_fd_query_user.c, branch v5.5.2

samples/bpf: Fix build for task_fd_query_user.c

2019-10-03T14:27:03Z

Add missing include for which was removed from perf-sys.h in commit 91854f9a077e ("perf tools: Move everything related to sys_perf_event_open() to perf-sys.h"). Fixes: 91854f9a077e ("perf tools: Move everything related to sys_perf_event_open() to perf-sys.h") Reported-by: KP Singh Reported-by: Florent Revest Signed-off-by: Björn Töpel Signed-off-by: Daniel Borkmann Tested-by: KP Singh Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20191001112249.27341-1-bjorn.topel@gmail.com

samples, bpf: suppress compiler warning

2019-05-21T14:55:20Z

GCC 9 fails to calculate the size of local constant strings and produces a false positive: samples/bpf/task_fd_query_user.c: In function ‘test_debug_fs_uprobe’: samples/bpf/task_fd_query_user.c:242:67: warning: ‘%s’ directive output may be truncated writing up to 255 bytes into a region of size 215 [-Wformat-truncation=] 242 | snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/%ss/%s/id", | ^~ 243 | event_type, event_alias); | ~~~~~~~~~~~ samples/bpf/task_fd_query_user.c:242:2: note: ‘snprintf’ output between 45 and 300 bytes into a destination of size 256 242 | snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/%ss/%s/id", | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 243 | event_type, event_alias); | ~~~~~~~~~~~~~~~~~~~~~~~~ Workaround this by lowering the buffer size to a reasonable value. Related GCC Bugzilla: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83431 Signed-off-by: Matteo Croce Signed-off-by: Daniel Borkmann

samples: bpf: fix: broken sample regarding removed function

2019-02-27T16:27:22Z

Currently, running sample "task_fd_query" and "tracex3" occurs the following error. On kernel v5.0-rc* this sample will be unavailable due to the removal of function 'blk_start_request' at commit "a1ce35f". (function removed, as "Single Queue IO scheduler" no longer exists) $ sudo ./task_fd_query failed to create kprobe 'blk_start_request' error 'No such file or directory' This commit will change the function 'blk_start_request' to 'blk_mq_start_request' to fix the broken sample. Signed-off-by: Daniel T. Lee Signed-off-by: Daniel Borkmann

samples/bpf: add a samples/bpf test for BPF_TASK_FD_QUERY

2018-05-25T01:18:20Z

This is mostly to test kprobe/uprobe which needs kernel headers. Signed-off-by: Yonghong Song Signed-off-by: Alexei Starovoitov