Commits
Yang Shi committed ac00881f922
bpf: convert hashtab lock to raw lock When running bpf samples on rt kernel, it reports the below warning: BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:917 in_atomic(): 1, irqs_disabled(): 128, pid: 477, name: ping Preemption disabled at:[<ffff80000017db58>] kprobe_perf_func+0x30/0x228 CPU: 3 PID: 477 Comm: ping Not tainted 4.1.10-rt8 #4 Hardware name: Freescale Layerscape 2085a RDB Board (DT) Call trace: [<ffff80000008a5b0>] dump_backtrace+0x0/0x128 [<ffff80000008a6f8>] show_stack+0x20/0x30 [<ffff8000007da90c>] dump_stack+0x7c/0xa0 [<ffff8000000e4830>] ___might_sleep+0x188/0x1a0 [<ffff8000007e2200>] rt_spin_lock+0x28/0x40 [<ffff80000018bf9c>] htab_map_update_elem+0x124/0x320 [<ffff80000018c718>] bpf_map_update_elem+0x40/0x58 [<ffff800000187658>] __bpf_prog_run+0xd48/0x1640 [<ffff80000017ca6c>] trace_call_bpf+0x8c/0x100 [<ffff80000017db58>] kprobe_perf_func+0x30/0x228 [<ffff80000017dd84>] kprobe_dispatcher+0x34/0x58 [<ffff8000007e399c>] kprobe_handler+0x114/0x250 [<ffff8000007e3bf4>] kprobe_breakpoint_handler+0x1c/0x30 [<ffff800000085b80>] brk_handler+0x88/0x98 [<ffff8000000822f0>] do_debug_exception+0x50/0xb8 Exception stack(0xffff808349687460 to 0xffff808349687580) 7460: 4ca2b600 ffff8083 4a3a7000 ffff8083 49687620 ffff8083 0069c5f8 ffff8000 7480: 00000001 00000000 007e0628 ffff8000 496874b0 ffff8083 007e1de8 ffff8000 74a0: 496874d0 ffff8083 0008e04c ffff8000 00000001 00000000 4ca2b600 ffff8083 74c0: 00ba2e80 ffff8000 49687528 ffff8083 49687510 ffff8083 000e5c70 ffff8000 74e0: 00c22348 ffff8000 00000000 ffff8083 49687510 ffff8083 000e5c74 ffff8000 7500: 4ca2b600 ffff8083 49401800 ffff8083 00000001 00000000 00000000 00000000 7520: 496874d0 ffff8083 00000000 00000000 00000000 00000000 00000000 00000000 7540: 2f2e2d2c 33323130 00000000 00000000 4c944500 ffff8083 00000000 00000000 7560: 00000000 00000000 008751e0 ffff8000 00000001 00000000 124e2d1d 00107b77 Convert hashtab lock to raw lock to avoid such warning. Signed-off-by: Yang Shi <yang.shi@linaro.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>