linux-dev - Linux kernel development work

Age	Commit message (Collapse)	Author	Files	Lines
2019-05-21	samples, bpf: suppress compiler warning	Matteo Croce	1	-1/+1
	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 <mcroce@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-02-27	samples: bpf: fix: broken sample regarding removed function	Daniel T. Lee	1	-1/+1
	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 <danieltimlee@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-05-24	samples/bpf: add a samples/bpf test for BPF_TASK_FD_QUERY	Yonghong Song	1	-0/+382
	This is mostly to test kprobe/uprobe which needs kernel headers. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>