linux-kernel - Re: [PATCH v2 02/19] netfs: Generate enums from trace symbol mapping lists

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Date:   Wed, 09 Mar 2022 10:30:36 -0500
From:   Jeff Layton <jlayton@...hat.com>
To:     David Howells <dhowells@...hat.com>, linux-cachefs@...hat.com
Cc:     Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        David Wysochanski <dwysocha@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Jeffle Xu <jefflexu@...ux.alibaba.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 02/19] netfs: Generate enums from trace symbol
 mapping lists

On Tue, 2022-03-08 at 23:25 +0000, David Howells wrote:
> netfs has a number of lists of symbols for use in tracing, listed in an
> enum and then listed again in a symbol->string mapping for use with
> __print_symbolic().  This is, however, redundant.
> 
> Instead, use the symbol->string mapping list to also generate the enum
> where the enum is in the same file.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: linux-cachefs@...hat.com
> 
> Link: https://lore.kernel.org/r/164622980839.3564931.5673300162465266909.stgit@warthog.procyon.org.uk/ # v1
> ---
> 
>  include/trace/events/netfs.h |   57 ++++++++++--------------------------------
>  1 file changed, 14 insertions(+), 43 deletions(-)
> 
> diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h
> index e6f4ebbb4c69..88d9a74dd346 100644
> --- a/include/trace/events/netfs.h
> +++ b/include/trace/events/netfs.h
> @@ -15,49 +15,6 @@
>  /*
>   * Define enums for tracing information.
>   */
> -#ifndef __NETFS_DECLARE_TRACE_ENUMS_ONCE_ONLY
> -#define __NETFS_DECLARE_TRACE_ENUMS_ONCE_ONLY
> -
> -enum netfs_read_trace {
> -	netfs_read_trace_expanded,
> -	netfs_read_trace_readahead,
> -	netfs_read_trace_readpage,
> -	netfs_read_trace_write_begin,
> -};
> -
> -enum netfs_rreq_trace {
> -	netfs_rreq_trace_assess,
> -	netfs_rreq_trace_done,
> -	netfs_rreq_trace_free,
> -	netfs_rreq_trace_resubmit,
> -	netfs_rreq_trace_unlock,
> -	netfs_rreq_trace_unmark,
> -	netfs_rreq_trace_write,
> -};
> -
> -enum netfs_sreq_trace {
> -	netfs_sreq_trace_download_instead,
> -	netfs_sreq_trace_free,
> -	netfs_sreq_trace_prepare,
> -	netfs_sreq_trace_resubmit_short,
> -	netfs_sreq_trace_submit,
> -	netfs_sreq_trace_terminated,
> -	netfs_sreq_trace_write,
> -	netfs_sreq_trace_write_skip,
> -	netfs_sreq_trace_write_term,
> -};
> -
> -enum netfs_failure {
> -	netfs_fail_check_write_begin,
> -	netfs_fail_copy_to_cache,
> -	netfs_fail_read,
> -	netfs_fail_short_readpage,
> -	netfs_fail_short_write_begin,
> -	netfs_fail_prepare_write,
> -};
> -
> -#endif
> -
>  #define netfs_read_traces					\
>  	EM(netfs_read_trace_expanded,		"EXPANDED ")	\
>  	EM(netfs_read_trace_readahead,		"READAHEAD")	\
> @@ -98,6 +55,20 @@ enum netfs_failure {
>  	EM(netfs_fail_short_write_begin,	"short-write-begin")	\
>  	E_(netfs_fail_prepare_write,		"prep-write")
>  
> +#ifndef __NETFS_DECLARE_TRACE_ENUMS_ONCE_ONLY
> +#define __NETFS_DECLARE_TRACE_ENUMS_ONCE_ONLY
> +
> +#undef EM
> +#undef E_
> +#define EM(a, b) a,
> +#define E_(a, b) a
> +
> +enum netfs_read_trace { netfs_read_traces } __mode(byte);
> +enum netfs_rreq_trace { netfs_rreq_traces } __mode(byte);
> +enum netfs_sreq_trace { netfs_sreq_traces } __mode(byte);
> +enum netfs_failure { netfs_failures } __mode(byte);
> +

Should you undef EM and E_ here after creating these?

> +#endif
>  
>  /*
>   * Export enum symbols via userspace.
> 
> 

Looks fine otherwise:

Acked-by: Jeff Layton <jlayton@...hat.com>