samples: bpf: Fix broken bpf programs due to removed symbol

>From commit f1394b798814 ("block: mark blk_account_io_completion
static") symbol blk_account_io_completion() has been marked as static,
which makes it no longer possible to attach kprobe to this event.
Currently, there are broken samples due to this reason.

As a solution to this, attach kprobe events to blk_account_io_done()
to modify them to perform the same behavior as before.

Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200818051641.21724-1-danieltimlee@gmail.com

diff --git a/samples/bpf/task_fd_query_kern.c b/samples/bpf/task_fd_query_kern.c
index 278ade5..c821294 100644 (file)
--- a/samples/bpf/task_fd_query_kern.c
+++ b/samples/bpf/task_fd_query_kern.c
@@ -10,7 +10,7 @@ int bpf_prog1(struct pt_regs *ctx)
        return 0;
 }
 
-SEC("kretprobe/blk_account_io_completion")
+SEC("kretprobe/blk_account_io_done")
 int bpf_prog2(struct pt_regs *ctx)
 {
        return 0;

diff --git a/samples/bpf/task_fd_query_user.c b/samples/bpf/task_fd_query_user.c
index ff2e9c1..4a74531 100644 (file)
--- a/samples/bpf/task_fd_query_user.c
+++ b/samples/bpf/task_fd_query_user.c
@@ -314,7 +314,7 @@ int main(int argc, char **argv)
        /* test two functions in the corresponding *_kern.c file */
        CHECK_AND_RET(test_debug_fs_kprobe(0, "blk_mq_start_request",
                                           BPF_FD_TYPE_KPROBE));
-       CHECK_AND_RET(test_debug_fs_kprobe(1, "blk_account_io_completion",
+       CHECK_AND_RET(test_debug_fs_kprobe(1, "blk_account_io_done",
                                           BPF_FD_TYPE_KRETPROBE));
 
        /* test nondebug fs kprobe */

diff --git a/samples/bpf/tracex3_kern.c b/samples/bpf/tracex3_kern.c
index 659613c..710a441 100644 (file)
--- a/samples/bpf/tracex3_kern.c
+++ b/samples/bpf/tracex3_kern.c
@@ -49,7 +49,7 @@ struct {
        __uint(max_entries, SLOTS);
 } lat_map SEC(".maps");
 
-SEC("kprobe/blk_account_io_completion")
+SEC("kprobe/blk_account_io_done")
 int bpf_prog2(struct pt_regs *ctx)
 {
        long rq = PT_REGS_PARM1(ctx);