On Wed, Dec 10, 2025 at 10:15:56PM -0700, Caleb Sander Mateos wrote:
The last_rw map is initialized with a value of 0 but later assigned the value args.sector + args.nr_sector, which has type sector_t = u64. bpftrace complains about the type mismatch between int64 and uint64: trace/seq_io.bt:18:3-59: ERROR: Type mismatch for @last_rw: trying to assign value of type 'uint64' when map already contains a value of type 'int64' @last_rw[$dev, str($2)] = (args.sector + args.nr_sector);
Cast the initial value to uint64 so bpftrace will load the program.
Signed-off-by: Caleb Sander Mateos csander@purestorage.com
tools/testing/selftests/ublk/trace/seq_io.bt | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/ublk/trace/seq_io.bt b/tools/testing/selftests/ublk/trace/seq_io.bt index 272ac54c9d5f..507a3ca05abf 100644 --- a/tools/testing/selftests/ublk/trace/seq_io.bt +++ b/tools/testing/selftests/ublk/trace/seq_io.bt @@ -2,11 +2,11 @@ $1: dev_t $2: RWBS $3: strlen($2) */ BEGIN {
- @last_rw[$1, str($2)] = 0;
- @last_rw[$1, str($2)] = (uint64)0;
Reviewed-by: Ming Lei ming.lei@redhat.com
Thanks, Ming