Yonghong Song 8482941f09 bpf: Add bpf_send_signal_thread() helper ... Commit 8b401f9ed2 ("bpf: implement bpf_send_signal() helper") added helper bpf_send_signal() which permits bpf program to send a signal to the current process. The signal may be delivered to any threads in the process. We found a use case where sending the signal to the current thread is more preferable. - A bpf program will collect the stack trace and then send signal to the user application. - The user application will add some thread specific information to the just collected stack trace for later analysis. If bpf_send_signal() is used, user application will need to check whether the thread receiving the signal matches the thread collecting the stack by checking thread id. If not, it will need to send signal to another thread through pthread_kill(). This patch proposed a new helper bpf_send_signal_thread(), which sends the signal to the thread corresponding to the current kernel task. This way, user space is guaranteed that bpf_program execution context and user space signal handling context are the same thread. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200115035002.602336-1-yhs@fb.com		2020-01-15 11:44:51 -08:00
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asm-generic	arch: sembuf.h: make uapi asm/sembuf.h self-contained	2019-12-04 19:44:14 -08:00
drm	drm/vmwgfx: Add surface dirty-tracking callbacks	2019-11-06 15:45:32 +01:00
linux	bpf: Add bpf_send_signal_thread() helper	2020-01-15 11:44:51 -08:00
misc	habanalabs: expose reset counters via existing INFO IOCTL	2019-11-21 11:35:47 +02:00
mtd	mtd: abi: do not use C++ style comments in uapi header	2019-07-07 20:31:29 +02:00
rdma	RDMA/efa: Expose RDMA read related attributes	2019-11-25 10:31:48 -04:00
scsi	scsi: use __u{8,16,32,64} instead of uint{8,16,32,64}_t in uapi headers	2019-08-12 22:19:27 -04:00
sound	ALSA: compress: add flac decoder params	2019-11-18 13:02:25 +00:00
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Kbuild	kbuild: re-implement Makefile.headersinst without recursion	2019-06-15 19:57:02 +09:00