linux-kernel - Re: [PATCH RFC 0/2] simple sysfs wrappers for single values

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Date:   Sat, 29 Aug 2020 18:23:13 -0700
From:   Joe Perches <joe@...ches.com>
To:     Alex Dewar <alex.dewar90@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        "David S. Miller" <davem@...emloft.net>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Sourabh Jain <sourabhjain@...ux.ibm.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 0/2] simple sysfs wrappers for single values

On Sat, 2020-08-29 at 17:28 -0700, Joe Perches wrote:
> On Sun, 2020-08-30 at 00:37 +0100, Alex Dewar wrote:
> > Hi all,
> > 
> > I've noticed there seems to have been a fair amount of discussion around
> > the subject of possible helper methods for use in the context of sysfs
> > show methods (which I haven't had a chance to go through in detail yet
> > -- sorry!), so I thought I'd send out a couple of patches I've been
> > working on for this, in case it's of any interest to anyone.
> 
> If you really want to do this, I suggest you get use
> wrappers like sysfs_emit_string, sysfs_emit_int, sysfs_emit_u64
> though I don't see _that_ much value.

Just fyi:

the treewide converted sysfs_emit uses
end up with these integer outputs:

$ git grep -P -oh 'sysfs_emit\(buf, "%\d*[luixd]*\\n"' | \
  sort | uniq -c | sort -rn
   1482 sysfs_emit(buf, "%d\n"
    549 sysfs_emit(buf, "%u\n"
    118 sysfs_emit(buf, "%ld\n"
    100 sysfs_emit(buf, "%lu\n"
     78 sysfs_emit(buf, "%llu\n"
     62 sysfs_emit(buf, "%i\n"
     47 sysfs_emit(buf, "%x\n"
     24 sysfs_emit(buf, "%lld\n"
     12 sysfs_emit(buf, "%llx\n"
     12 sysfs_emit(buf, "%08x\n"
     12 sysfs_emit(buf, "%02x\n"
     10 sysfs_emit(buf, "%016llx\n"
      8 sysfs_emit(buf, "%04x\n"
      6 sysfs_emit(buf, "%lx\n"
      5 sysfs_emit(buf, "%02d\n"
      4 sysfs_emit(buf, "%04d\n"
      2 sysfs_emit(buf, "%08lx\n"
      1 sysfs_emit(buf, "%li\n"
      1 sysfs_emit(buf, "%4x\n"
      1 sysfs_emit(buf, "%0x\n"
      1 sysfs_emit(buf, "%06x\n"
      1 sysfs_emit(buf, "%03x\n"
      1 sysfs_emit(buf, "%01x\n"
>