Commit e9ef073a authored by Babu Moger's avatar Babu Moger Committed by Linus Torvalds

include: warn for inconsistent endian config definition

We have seen some generic code use config parameter CONFIG_CPU_BIG_ENDIAN
to decide the endianness.

Here are the few examples.
include/asm-generic/qrwlock.h
drivers/of/base.c
drivers/of/fdt.c
drivers/tty/serial/earlycon.c
drivers/tty/serial/serial_core.c

Display warning if CPU_BIG_ENDIAN is not defined on big endian
architecture and also warn if it defined on little endian architectures.

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

Link: http://lkml.kernel.org/r/1499358861-179979-4-git-send-email-babu.moger@oracle.comSigned-off-by: default avatarBabu Moger <babu.moger@oracle.com>
Suggested-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: David S. Miller <davem@davemloft.net>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Cc: Michal Simek <monstr@monstr.eu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 206d3642
......@@ -3,5 +3,9 @@
#include <uapi/linux/byteorder/big_endian.h>
#ifndef CONFIG_CPU_BIG_ENDIAN
#warning inconsistent configuration, needs CONFIG_CPU_BIG_ENDIAN
#endif
#include <linux/byteorder/generic.h>
#endif /* _LINUX_BYTEORDER_BIG_ENDIAN_H */
......@@ -3,5 +3,9 @@
#include <uapi/linux/byteorder/little_endian.h>
#ifdef CONFIG_CPU_BIG_ENDIAN
#warning inconsistent configuration, CONFIG_CPU_BIG_ENDIAN is set
#endif
#include <linux/byteorder/generic.h>
#endif /* _LINUX_BYTEORDER_LITTLE_ENDIAN_H */
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