From: Hou Tao <houtao1@xxxxxxxxxx> Hi, The patchset series supports writable context for bare tracepoint. The main idea comes from patchset "writable contexts for bpf raw tracepoints" [1], but it only supports normal tracepoint with associated trace event under tracefs. Now we have one use case in which we add bare tracepoint in VFS layer, and update file::f_mode for specific files. The reason using bare tracepoint is that it doesn't form a ABI and we can change it freely. So add support for it in BPF. Comments are always welcome. [1]: https://lore.kernel.org/lkml/20190426184951.21812-1-mmullins@xxxxxx Change log: v5: * rebased on bpf-next * patch 1: add Acked-by tag * patch 2: handle invalid section name, make prefixes array being const v4: https://www.spinics.net/lists/bpf/msg47021.html * rebased on bpf-next * update patch 2 to add support for writable raw tracepoint attachment in attach_raw_tp(). * update patch 3 to add Acked-by tag v3: https://www.spinics.net/lists/bpf/msg46824.html * use raw_tp.w instead of raw_tp_writable as section name of writable tp * use ASSERT_XXX() instead of CHECK() * define a common macro for "/sys/kernel/bpf_testmod" v2: https://www.spinics.net/lists/bpf/msg46356.html * rebase on bpf-next tree * address comments from Yonghong Song * rename bpf_testmode_test_writable_ctx::ret as early_ret to reflect its purpose better. v1: https://www.spinics.net/lists/bpf/msg46221.html Hou Tao (3): bpf: support writable context for bare tracepoint libbpf: support detecting and attaching of writable tracepoint program bpf/selftests: add test for writable bare tracepoint include/trace/bpf_probe.h | 19 +++++++--- tools/lib/bpf/libbpf.c | 26 +++++++++++--- .../bpf/bpf_testmod/bpf_testmod-events.h | 15 ++++++++ .../selftests/bpf/bpf_testmod/bpf_testmod.c | 10 ++++++ .../selftests/bpf/bpf_testmod/bpf_testmod.h | 5 +++ .../selftests/bpf/prog_tests/module_attach.c | 35 +++++++++++++++++++ .../selftests/bpf/progs/test_module_attach.c | 14 ++++++++ tools/testing/selftests/bpf/test_progs.c | 4 +-- tools/testing/selftests/bpf/test_progs.h | 2 ++ 9 files changed, 119 insertions(+), 11 deletions(-) -- 2.20.1
