linux-kernel - [PATCH v3 0/3] Define CPU_BIG_ENDIAN or warn for inconsistencies

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Message-Id: <1497305400-147425-1-git-send-email-babu.moger@oracle.com>
Date:   Mon, 12 Jun 2017 15:09:57 -0700
From:   Babu Moger <babu.moger@...cle.com>
To:     ysato@...rs.sourceforge.jp, geert@...ux-m68k.org,
        jonas@...thpole.se, stefan.kristiansson@...nalahti.fi,
        shorne@...il.com, jejb@...isc-linux.org, deller@....de,
        davem@...emloft.net, viro@...iv.linux.org.uk, monstr@...str.eu
Cc:     mpe@...erman.id.au, peterz@...radead.org, mingo@...hat.com,
        jcmvbkbc@...il.com, linux-kernel@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp, linux-m68k@...r.kernel.org,
        openrisc@...ts.librecores.org, linux-parisc@...r.kernel.org,
        sparclinux@...r.kernel.org
Subject: [PATCH v3 0/3] Define CPU_BIG_ENDIAN or warn for inconsistencies

Found this problem while enabling queued rwlock on SPARC.
The parameter CONFIG_CPU_BIG_ENDIAN is used to clear the
specific byte in qrwlock structure. Without this parameter,
we clear the wrong byte.
Here is the code in include/asm-generic/qrwlock.h

static inline u8 *__qrwlock_write_byte(struct qrwlock *lock)
  {
         return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN);
  }

Also found few more references of this parameter in
drivers/of/base.c
drivers/of/fdt.c
drivers/tty/serial/earlycon.c
drivers/tty/serial/serial_core.c

Here is our previous discussion.
https://lkml.org/lkml/2017/5/24/620

Based on the discussion, it was decided to add CONFIG_CPU_BIG_ENDIAN
for all the fixed big endian architecture(frv, h8300, m68k, openrisc,
parisc and sparc). And warn if there are inconsistencies in this definition.

v2 -> v3:
 Added the choice statement for endianness selection for microblaze.
 Updated the Makefile for microblaze(Suggested by Arnd Bergmann) to
 properly compile for the correct format.
 Updated acks.

v1 -> v2:
 Updated the commit messages and acks.

Babu Moger (3):
  arch: Define CPU_BIG_ENDIAN for all fixed big endian archs
  arch/microblaze: Add choice for endianness and update Makefile
  include: warn for inconsistent endian config definition

 arch/frv/Kconfig                        |    3 +++
 arch/h8300/Kconfig                      |    3 +++
 arch/m68k/Kconfig                       |    3 +++
 arch/microblaze/Kconfig                 |   16 ++++++++++++++++
 arch/microblaze/Makefile                |    2 ++
 arch/openrisc/Kconfig                   |    3 +++
 arch/parisc/Kconfig                     |    3 +++
 arch/sparc/Kconfig                      |    3 +++
 include/linux/byteorder/big_endian.h    |    4 ++++
 include/linux/byteorder/little_endian.h |    4 ++++
 10 files changed, 44 insertions(+), 0 deletions(-)