samples: bpf: fix: broken sample regarding removed function
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>
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@ -4,7 +4,7 @@
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#include <uapi/linux/bpf.h>
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#include "bpf_helpers.h"
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SEC("kprobe/blk_start_request")
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SEC("kprobe/blk_mq_start_request")
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int bpf_prog1(struct pt_regs *ctx)
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{
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return 0;
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@ -311,7 +311,7 @@ int main(int argc, char **argv)
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}
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/* test two functions in the corresponding *_kern.c file */
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CHECK_AND_RET(test_debug_fs_kprobe(0, "blk_start_request",
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CHECK_AND_RET(test_debug_fs_kprobe(0, "blk_mq_start_request",
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BPF_FD_TYPE_KPROBE));
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CHECK_AND_RET(test_debug_fs_kprobe(1, "blk_account_io_completion",
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BPF_FD_TYPE_KRETPROBE));
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@ -20,7 +20,7 @@ struct bpf_map_def SEC("maps") my_map = {
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/* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
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* example will no longer be meaningful
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*/
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SEC("kprobe/blk_start_request")
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SEC("kprobe/blk_mq_start_request")
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int bpf_prog1(struct pt_regs *ctx)
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{
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long rq = PT_REGS_PARM1(ctx);
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