Re: [PATCH] NFSD: Resolve the recall-any mask names in the trace format

On Tue, 2026-08-18 at 14:41 -0400, Chuck Lever wrote:
> RCA4_TYPE_MASK_* are enum constants, so the preprocessor cannot fold
> them into the print format that show_rca_mask() builds for the
> nfsd_cb_recall_any event. Nothing declares an eval map for them
> either, so trace_event_eval_update() has no substitution to apply at
> module load, and the event's format file ships the enumerator names
> verbatim. trace-cmd and perf cannot decode the bmval0 field.
> 
> Declare the eval maps for the nine mask bits show_rca_mask() decodes.
> The format then carries the shift counts as integers, the same shape
> the SUNRPC trace points already emit from their BIT() flag decoders.
> 
> Fixes: 638593be55c0 ("NFSD: add CB_RECALL_ANY tracepoints")
> Signed-off-by: Chuck Lever <[email protected]>
> ---
>  fs/nfsd/trace.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
> index 3fa4d63cd30f..4fb1f32a3787 100644
> --- a/fs/nfsd/trace.h
> +++ b/fs/nfsd/trace.h
> @@ -1946,6 +1946,16 @@ TRACE_EVENT(nfsd_cb_offload,
>  		__entry->fh_hash, __entry->count, __entry->status)
>  );
>  
> +TRACE_DEFINE_ENUM(RCA4_TYPE_MASK_RDATA_DLG);
> +TRACE_DEFINE_ENUM(RCA4_TYPE_MASK_WDATA_DLG);
> +TRACE_DEFINE_ENUM(RCA4_TYPE_MASK_DIR_DLG);
> +TRACE_DEFINE_ENUM(RCA4_TYPE_MASK_FILE_LAYOUT);
> +TRACE_DEFINE_ENUM(RCA4_TYPE_MASK_BLK_LAYOUT);
> +TRACE_DEFINE_ENUM(RCA4_TYPE_MASK_OBJ_LAYOUT_MIN);
> +TRACE_DEFINE_ENUM(RCA4_TYPE_MASK_OBJ_LAYOUT_MAX);
> +TRACE_DEFINE_ENUM(RCA4_TYPE_MASK_OTHER_LAYOUT_MIN);
> +TRACE_DEFINE_ENUM(RCA4_TYPE_MASK_OTHER_LAYOUT_MAX);
> +
>  #define show_rca_mask(x) \
>  	__print_flags(x, "|", \
>  		{ BIT(RCA4_TYPE_MASK_RDATA_DLG),	"RDATA_DLG" }, \

Reviewed-by: Jeff Layton <[email protected]>