linux-kernel - simplify procfs code for seq

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Message-Id: <20180516094346.20506-1-hch@lst.de>
Date:   Wed, 16 May 2018 11:43:04 +0200
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-acpi@...r.kernel.org, drbd-dev@...ts.linbit.com,
        linux-ide@...r.kernel.org, netdev@...r.kernel.org,
        linux-rtc@...r.kernel.org, megaraidlinux.pdl@...adcom.com,
        linux-scsi@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-afs@...ts.infradead.org, linux-ext4@...r.kernel.org,
        jfs-discussion@...ts.sourceforge.net,
        netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: simplify procfs code for seq_file instances V3

We currently have hundreds of proc files that implement plain, read-only
seq_file based interfaces.  This series consolidates them using new
procfs helpers that take the seq_operations or simple show callback
directly.

A git tree is available at:

    git://git.infradead.org/users/hch/misc.git proc_create.3

Gitweb:

    http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/proc_create.3

Changes since V2:
 - use unsigned int for state_size everywhere
 - move state_size around in proc_dir_entry to use a struct packing hole
 - update SIZEOF_PDE_INLINE_NAME
 - added a new proc_pid_ns helper
 - improved a few changelogs
 - added back a nubus comment
 - minor typo fix
 - collected various ACKs

Changes since V1:
 - open code proc_create_data to avoid setting not fully initialized
   entries live
 - use unsigned int for state_size
 - dropped the s390/cio/blacklist hunk as it has a write method
 - dropped the IPMI patch given that IPMI proc support is scheduled for
   removal.