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| author | Geert Uytterhoeven <geert@linux-m68k.org> | 2017-11-15 17:31:18 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-28 10:19:44 +0100 |
| commit | 9ce9f4e4a543b457551728764e2d297cd40dee53 (patch) | |
| tree | d5d6e7341092439d7dae9609052f8ce380a13dc3 | |
| parent | 821e97898016456bc7b42063ac91c0063f88a8dd (diff) | |
| download | linux-stable-9ce9f4e4a543b457551728764e2d297cd40dee53.tar.gz linux-stable-9ce9f4e4a543b457551728764e2d297cd40dee53.tar.bz2 linux-stable-9ce9f4e4a543b457551728764e2d297cd40dee53.zip | |
m32r: fix endianness constraints
commit c95f121142a41c951fd62683a5574f2a7b37c573 upstream.
The m32r Kconfig provides both CPU_BIG_ENDIAN and CPU_LITTLE_ENDIAN
configuration options. As they are user-selectable and independent,
this allows invalid configurations:
- All m32r defconfigs build a big endian kernel, but CPU_BIG_ENDIAN is
not set, causing compiler warnings like:
include/linux/byteorder/big_endian.h:7:2: warning: #warning inconsistent configuration, needs CONFIG_CPU_BIG_ENDIAN [-Wcpp]
#warning inconsistent configuration, needs CONFIG_CPU_BIG_ENDIAN
^
- Since commit 5bdfca6435b82944 ("m32r: define CPU_BIG_ENDIAN"),
building an allmodconfig or allyesconfig enables both
CONFIG_CPU_BIG_ENDIAN and CONFIG_CPU_LITTLE_ENDIAN.
While this did get rid of the warning above, both options are
obviously mutually exclusive.
Fix this by making only CPU_LITTLE_ENDIAN configurable by the user, as
before, and by making sure exactly one of CPU_BIG_ENDIAN and
CPU_LITTLE_ENDIAN is always enabled.
Link: http://lkml.kernel.org/r/1509361505-18150-1-git-send-email-geert@linux-m68k.org
Fixes: 5bdfca6435b82944 ("m32r: define CPU_BIG_ENDIAN")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/m32r/Kconfig | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig index 0d9446c37ae8..498398d915c1 100644 --- a/arch/m32r/Kconfig +++ b/arch/m32r/Kconfig @@ -196,8 +196,8 @@ config TIMER_DIVIDE default "128" config CPU_BIG_ENDIAN - bool "Generate big endian code" - default n + bool + default !CPU_LITTLE_ENDIAN config CPU_LITTLE_ENDIAN bool "Generate little endian code" |