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Message-ID: <54055FF8.3080907@gmail.com>
Date: Tue, 02 Sep 2014 14:13:12 +0800
From: Chen Gang <gang.chen.5i5j@...il.com>
To: Paul Gortmaker <paul.gortmaker@...driver.com>,
"H. Peter Anvin" <hpa@...or.com>
CC: eparis@...hat.com, paulmck@...ux.vnet.ibm.com,
Geert Uytterhoeven <geert@...ux-m68k.org>,
zhenglong.cai@...c.com.cn, khilman@...aro.org, ak@...ux.intel.com,
mcgrof@...e.com, fabf@...net.be,
"dhowells@...hat.com" <dhowells@...hat.com>, pefoley2@...oley.com,
mgorman@...e.de, biederm@...ssion.com,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Arnd Bergmann <arnd@...db.de>, Jean Delvare <jdelvare@...e.de>
Subject: Re: [PATCH] init/Kconfig: Add ENDIAN attributes for all architectures
using
On 9/2/14 13:17, Paul Gortmaker wrote:
> [Re: [PATCH] init/Kconfig: Add ENDIAN attributes for all architectures using] On 01/09/2014 (Mon 10:01) H. Peter Anvin wrote:
>
>> On 09/01/2014 09:08 AM, Paul Gortmaker wrote:
>>>>>
>>>> diff --git a/init/Kconfig b/init/Kconfig
>>>> index ac033c3..f301cc8 100644
>>>> --- a/init/Kconfig
>>>> +++ b/init/Kconfig
>>>> @@ -23,6 +23,12 @@ config CONSTRUCTORS
>>>> config IRQ_WORK
>>>> bool
>>>>
>>>> +config CPU_LITTLE_ENDIAN
>>>> + bool
>>>> +
>>>> +config CPU_BIG_ENDIAN
>>>> + bool
>>>
>>> Perhaps you should take a cursory look at what already exists in tree
>>> before blindly trying to add more to it?
>>>
>>> $ git grep CPU_BIG_ENDIAN | wc -l
>>> 88
>>>
>>
>> The whole point of this patchset is to make these already widely-used
>> options universal across the tree.
>
> OK, but that was not at _all_ what I thought when looking at this...
>
> Instead I saw a well intentioned, but perhaps not fully thought out
> attempt at fixing a largely irrelevant randconfig/allmodconfig of a
> 1990's vintage ISDN driver coming from that x86-only era, built against
> an architecture that will never use or support it (microblaze).
>
> In today's world, we'd probably not accept a new ethernet driver or
> filesystem if it was incapable of handling both BE and LE (exception
> being SoC ethernet physically bound to one specific CPU, of course.)
> So the justification given in the commit log for expanding the scope to
> better deal with the stuff found in ISDN and the like was questionable.
>
After a simple search, for crypto, it may be endian sensitive, and for
architectures may be endian sensitive, in config time.
bash-3.2# find ./ | grep Kconfig | xargs grep depend | grep ENDIAN
.//arch/arm/mm/Kconfig: depends on ARCH_SUPPORTS_BIG_ENDIAN
.//arch/arm/mm/Kconfig: depends on CPU_BIG_ENDIAN
.//arch/arm/mm/Kconfig: depends on CPU_BIG_ENDIAN
.//arch/arm64/Kconfig: depends on OF && !CPU_BIG_ENDIAN
.//arch/mips/Kconfig: depends on SYS_SUPPORTS_BIG_ENDIAN
.//arch/mips/Kconfig: depends on SYS_SUPPORTS_LITTLE_ENDIAN
.//arch/mips/Kconfig: depends on SGI_IP22 || SGI_IP28 || (SNI_RM && CPU_LITTLE_ENDIAN)
.//arch/powerpc/platforms/Kconfig.cputype: depends on !CPU_LITTLE_ENDIAN
.//arch/powerpc/platforms/Kconfig.cputype: depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
.//arch/powerpc/platforms/Kconfig.cputype: depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
.//arch/powerpc/platforms/Kconfig.cputype: depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
.//arch/powerpc/platforms/Kconfig.cputype: depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
.//arch/powerpc/platforms/Kconfig.cputype: depends on CPU_LITTLE_ENDIAN
[...]
.//crypto/Kconfig: depends on ARM && KERNEL_MODE_NEON && !CPU_BIG_ENDIAN
.//crypto/Kconfig: depends on ARM && KERNEL_MODE_NEON && !CPU_BIG_ENDIAN
.//drivers/crypto/Kconfig: depends on PPC64 && IBMVIO && !CPU_LITTLE_ENDIAN
[...]
It is a simple search, so I am not sure whether have other modules also
need LE or BE.
> Secondly, I don't think it is well known that Kbuild will tolerate
> multiply defined symbols of the exact same name, and since that isn't
> mentioned in the commit log (as documented and/or tested), I envisioned
> this breaking powerpc and other arch who already define one (or both)
> of these two. I found multi-define _is_ documented as supported in
> Documentation/kbuild but I still wonder how much it is used and how
> well it handles things like in powerpc, where one of them (LE?) also
> lists a "select ... " line and help text under the bool.
>
> So if we want to do this, I'd suggest a commit log that really gets
> to the intended point; something along the lines of:
>
> --------------
>
> Currently we have some architectures defining their own bool for
> CPU_LITTLE_ENDIAN and/or CPU_BIG_ENDIAN. As of 3.17-rc3 we have:
>
> CPU_BIG_ENDIAN: arc, arm, arm64, c6x, mips, powerpc, sh
> CPU_LITTLE_ENDIAN: m32r, mips, powerpc, sh
>
> Note that the scope does not cover all arch, which reduces the utility
> value of these items in generic and/or arch independent code, as
> neither may be defined, making tests on their values inconclusive.
>
> To fix the above, the goal is to make both items present in an arch
> independent Kconfig. We can do this immediately without having to
> simultaneously touch the existing arch bool definitions because...
>
> This change was tested on a powerpc LE config since it has help text
> and a select line, and the behaviour of both before and after the
> change was found to be ...
>
> --------------
>
> Also, having the suggested change Cc'd to linux-arch would be sensible,
> I think. And one might want to make it a series, showing the follow on
> arch specific commits you have planned that "select" an endian, since
> the maintainers may want evidence it will be carried to completion and
> they also may have something additional to say (as in the case of arch/arm
> where there is already CPU_ENDIAN_BE8 and CPU_ENDIAN_BE32 Kconfig items).
>
> Paul.
> --
>
OK, thanks, what you said above have valuable information to me.
But could you help check my original mail for it? (may also need check
all related replies in kernel mailing list). After finish checking,
welcome any ideas, suggestions or completions.
Thanks.
-------- Forwarded Message --------
Subject: [PATCH v3] arch: Kconfig: Let all architectures set endian explicitly
Date: Fri, 15 Aug 2014 00:54:53 +0800
From: Chen Gang <gang.chen.5i5j@...il.com>
To: Arnd Bergmann <arnd@...db.de>, akpm@...ux-foundation.org, rth@...ddle.net, ink@...assic.park.msu.ru, mattst88@...il.com, vgupta@...opsys.com, Geert Uytterhoeven <geert@...ux-m68k.org>, Jean Delvare <jdelvare@...e.de>, linux@....linux.org.uk, catalin.marinas@....com, will.deacon@....com, hskinnemoen@...il.com, egtvedt@...fundet.no, realmz6@...il.com, msalter@...hat.com, a-jacquiot@...com, starvik@...s.com, jesper.nilsson@...s.com, dhowells@...hat.com, rkuo@...eaurora.org, tony.luck@...el.com, fenghua.yu@...el.com, takata@...ux-m32r.org, james.hogan@...tec.com, Michal Simek <monstr@...str.eu>, ralf@...ux-mips.org, yasutake.koichi@...panasonic.com, jonas@...thpole.se, jejb@...isc-linux.org, deller@....de, Benjamin Herrenschmidt <benh@...nel.crashing.org>, paulus@...ba.org, mpe@...erman.id.au, Martin Schwidefsky <schwidefsky@...ibm.com>, heiko.carstens@...ibm.com, Liqin Chen <liqin.linux@...il.com>, Lennox Wu <lennox.wu@...il.com>, David S. Miller <davem@...emloft.net>, cmetcalf@...er
a.com, jdike@...toit.com, Richard Weinberger <richard@....at>, gxt@...c.pku.edu.cn, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, chris@...kel.net, jcmvbkbc@...il.com
CC: linux390@...ibm.com, x86@...nel.org, linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org <linux-kernel@...r.kernel.org>, linux-arm-kernel@...ts.infradead.org, adi-buildroot-devel@...ts.sourceforge.net, linux-c6x-dev@...ux-c6x.org, linux-cris-kernel@...s.com, linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org, linux-m32r@...linux-m32r.org, linux-m32r-ja@...linux-m32r.org, linux-m68k@...ts.linux-m68k.org, linux-metag@...r.kernel.org, linux-mips@...ux-mips.org, linux-am33-list@...hat.com, linux@...ts.openrisc.net, linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org, sparclinux@...r.kernel.org, user-mode-linux-devel@...ts.sourceforge.net, user-mode-linux-user@...ts.sourceforge.net, linux-xtensa@...ux-xtensa.org
Normal architectures:
- Big endian: avr32, frv, m68k, openrisc, parisc, s390, sparc
- Little endian: alpha, blackfin, cris, hexagon, ia64, metag, mn10300,
score, unicore32, x86
- Choose in config time: arc, arm, arm64, c6x, m32r, mips, powerpc, sh
Special architectures:
- Deside by compiler: microblaze, tile, xtensa.
- Deside by building host: um
- Next, need improve Kbuild to probe endian to deside whether need mark
__BUILDING_TIME_BIG_ENDIAN__ before real config.
Another improvements:
- score: use '\t' instead of ' '.
- s390: sort the select value in alpha order.
Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
---
arch/alpha/Kconfig | 1 +
arch/arc/Kconfig | 1 +
arch/arm/Kconfig | 1 +
arch/arm64/Kconfig | 1 +
arch/avr32/Kconfig | 1 +
arch/blackfin/Kconfig | 1 +
arch/c6x/Kconfig | 1 +
arch/cris/Kconfig | 1 +
arch/frv/Kconfig | 1 +
arch/hexagon/Kconfig | 1 +
arch/ia64/Kconfig | 1 +
arch/m32r/Kconfig | 1 +
arch/m68k/Kconfig | 1 +
arch/metag/Kconfig | 1 +
arch/microblaze/Kconfig | 2 ++
arch/mips/Kconfig | 1 +
arch/mn10300/Kconfig | 1 +
arch/openrisc/Kconfig | 1 +
arch/parisc/Kconfig | 1 +
arch/powerpc/Kconfig | 1 +
arch/s390/Kconfig | 3 ++-
arch/score/Kconfig | 21 +++++++++++----------
arch/sparc/Kconfig | 1 +
arch/tile/Kconfig | 2 ++
arch/um/Kconfig.common | 2 ++
arch/unicore32/Kconfig | 1 +
arch/x86/Kconfig | 1 +
arch/xtensa/Kconfig | 2 ++
init/Kconfig | 6 ++++++
29 files changed, 49 insertions(+), 11 deletions(-)
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index b7ff9a3..1cb7426 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -27,6 +27,7 @@ config ALPHA
select MODULES_USE_ELF_RELA
select ODD_RT_SIGACTION
select OLD_SIGSUSPEND
+ select CPU_LITTLE_ENDIAN
help
The Alpha is a 64-bit general-purpose processor designed and
marketed by the Digital Equipment Corporation of blessed memory,
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 9596b0a..e939abd 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -35,6 +35,7 @@ config ARC
select OF_EARLY_FLATTREE
select PERF_USE_VMALLOC
select HAVE_DEBUG_STACKOVERFLOW
+ select CPU_LITTLE_ENDIAN if !CPU_BIG_ENDIAN
config TRACE_IRQFLAGS_SUPPORT
def_bool y
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 32cbbd5..3a806b3 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -12,6 +12,7 @@ config ARM
select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT if MMU
select CLONE_BACKWARDS
+ select CPU_LITTLE_ENDIAN if !CPU_BIG_ENDIAN
select CPU_PM if (SUSPEND || CPU_IDLE)
select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 62b4ae1..c5a91de 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -17,6 +17,7 @@ config ARM64
select BUILDTIME_EXTABLE_SORT
select CLONE_BACKWARDS
select COMMON_CLK
+ select CPU_LITTLE_ENDIAN if !CPU_BIG_ENDIAN
select CPU_PM if (SUSPEND || CPU_IDLE)
select DCACHE_WORD_ACCESS
select GENERIC_CLOCKEVENTS
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index b6878eb..fab44ee 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -17,6 +17,7 @@ config AVR32
select GENERIC_CLOCKEVENTS
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
+ select CPU_BIG_ENDIAN
help
AVR32 is a high-performance 32-bit RISC microprocessor core,
designed for cost-sensitive embedded applications, with particular
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index ed30699..348f16d 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -40,6 +40,7 @@ config BLACKFIN
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select HAVE_DEBUG_STACKOVERFLOW
+ select CPU_LITTLE_ENDIAN
config GENERIC_CSUM
def_bool y
diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig
index 77ea09b..7e74d14 100644
--- a/arch/c6x/Kconfig
+++ b/arch/c6x/Kconfig
@@ -17,6 +17,7 @@ config C6X
select OF_EARLY_FLATTREE
select GENERIC_CLOCKEVENTS
select MODULES_USE_ELF_RELA
+ select CPU_LITTLE_ENDIAN if !CPU_BIG_ENDIAN
config MMU
def_bool n
diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index 52731e2..405a097 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -52,6 +52,7 @@ config CRIS
select CLONE_BACKWARDS2
select OLD_SIGSUSPEND
select OLD_SIGACTION
+ select CPU_LITTLE_ENDIAN
config HZ
int
diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
index 34aa193..aa21ccc 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig
@@ -14,6 +14,7 @@ config FRV
select OLD_SIGSUSPEND3
select OLD_SIGACTION
select HAVE_DEBUG_STACKOVERFLOW
+ select CPU_BIG_ENDIAN
config ZONE_DMA
bool
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 4dc89d1..ee91285 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -28,6 +28,7 @@ config HEXAGON
select MODULES_USE_ELF_RELA
select GENERIC_CPU_DEVICES
select HAVE_DMA_ATTRS
+ select CPU_LITTLE_ENDIAN
---help---
Qualcomm Hexagon is a processor architecture designed for high
performance and low power across a wide variety of applications.
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index c84c88b..54f32c7 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -49,6 +49,7 @@ config IA64
select MODULES_USE_ELF_RELA
select ARCH_USE_CMPXCHG_LOCKREF
select HAVE_ARCH_AUDITSYSCALL
+ select CPU_LITTLE_ENDIAN
default y
help
The Itanium Processor Family is Intel's 64-bit successor to
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 9e44bbd..1932483 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -16,6 +16,7 @@ config M32R
select ARCH_USES_GETTIMEOFFSET
select MODULES_USE_ELF_RELA
select HAVE_DEBUG_STACKOVERFLOW
+ select CPU_BIG_ENDIAN if !CPU_LITTLE_ENDIAN
config SBUS
bool
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 87b7c75..7a7fe25 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -23,6 +23,7 @@ config M68K
select MODULES_USE_ELF_RELA
select OLD_SIGSUSPEND3
select OLD_SIGACTION
+ select CPU_BIG_ENDIAN
config RWSEM_GENERIC_SPINLOCK
bool
diff --git a/arch/metag/Kconfig b/arch/metag/Kconfig
index 0b389a8..e57c6a0 100644
--- a/arch/metag/Kconfig
+++ b/arch/metag/Kconfig
@@ -29,6 +29,7 @@ config METAG
select OF
select OF_EARLY_FLATTREE
select SPARSE_IRQ
+ select CPU_LITTLE_ENDIAN
config STACKTRACE_SUPPORT
def_bool y
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 40e1c1d..d80ae78 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -7,6 +7,8 @@ config MICROBLAZE
select CLKSRC_OF
select CLONE_BACKWARDS3
select COMMON_CLK
+ select CPU_BIG_ENDIAN if __BUILDING_TIME_BIG_ENDIAN__
+ select CPU_LITTLE_ENDIAN if !CPU_BIG_ENDIAN
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select GENERIC_CPU_DEVICES
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 900c7e5..671d822 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -52,6 +52,7 @@ config MIPS
select HAVE_CC_STACKPROTECTOR
select CPU_PM if CPU_IDLE
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+ select CPU_LITTLE_ENDIAN if !CPU_BIG_ENDIAN
menu "Machine selection"
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index a648de1..60fb249 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -13,6 +13,7 @@ config MN10300
select OLD_SIGSUSPEND3
select OLD_SIGACTION
select HAVE_DEBUG_STACKOVERFLOW
+ select CPU_LITTLE_ENDIAN
config AM33_2
def_bool n
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index 88e8336..4757b7d 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -23,6 +23,7 @@ config OPENRISC
select MODULES_USE_ELF_RELA
select HAVE_DEBUG_STACKOVERFLOW
select OR1K_PIC
+ select CPU_BIG_ENDIAN
config MMU
def_bool y
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 6e75e20..dc82137 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -29,6 +29,7 @@ config PARISC
select TTY # Needed for pdc_cons.c
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_ARCH_AUDITSYSCALL
+ select CPU_BIG_ENDIAN
help
The PA-RISC microprocessor is designed by Hewlett-Packard and used
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 4bc7b62..644c6d4 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -147,6 +147,7 @@ config PPC
select ARCH_USE_CMPXCHG_LOCKREF if PPC64
select HAVE_ARCH_AUDITSYSCALL
select ARCH_SUPPORTS_ATOMIC_RMW
+ select CPU_LITTLE_ENDIAN if !CPU_BIG_ENDIAN
config GENERIC_CSUM
def_bool CPU_LITTLE_ENDIAN
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 05c78bb..8691c6f 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -62,6 +62,7 @@ config S390
def_bool y
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
+ select ARCH_HAS_SG_CHAIN
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_INLINE_READ_LOCK
select ARCH_INLINE_READ_LOCK_BH
@@ -97,6 +98,7 @@ config S390
select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT
select CLONE_BACKWARDS2
+ select CPU_BIG_ENDIAN
select GENERIC_CLOCKEVENTS
select GENERIC_CPU_DEVICES if !SMP
select GENERIC_FIND_FIRST_BIT
@@ -145,7 +147,6 @@ config S390
select TTY
select VIRT_CPU_ACCOUNTING
select VIRT_TO_BUS
- select ARCH_HAS_SG_CHAIN
config SCHED_OMIT_FRAME_POINTER
def_bool y
diff --git a/arch/score/Kconfig b/arch/score/Kconfig
index 4ac8cae..713b290 100644
--- a/arch/score/Kconfig
+++ b/arch/score/Kconfig
@@ -1,19 +1,20 @@
menu "Machine selection"
config SCORE
- def_bool y
- select GENERIC_IRQ_SHOW
- select GENERIC_IOMAP
- select GENERIC_ATOMIC64
- select HAVE_MEMBLOCK
- select HAVE_MEMBLOCK_NODE_MAP
- select ARCH_DISCARD_MEMBLOCK
- select GENERIC_CPU_DEVICES
- select GENERIC_CLOCKEVENTS
- select HAVE_MOD_ARCH_SPECIFIC
+ def_bool y
+ select GENERIC_IRQ_SHOW
+ select GENERIC_IOMAP
+ select GENERIC_ATOMIC64
+ select HAVE_MEMBLOCK
+ select HAVE_MEMBLOCK_NODE_MAP
+ select ARCH_DISCARD_MEMBLOCK
+ select GENERIC_CPU_DEVICES
+ select GENERIC_CLOCKEVENTS
+ select HAVE_MOD_ARCH_SPECIFIC
select VIRT_TO_BUS
select MODULES_USE_ELF_REL
select CLONE_BACKWARDS
+ select CPU_LITTLE_ENDIAN
choice
prompt "System type"
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index a537816..9de09e6 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -43,6 +43,7 @@ config SPARC
select ODD_RT_SIGACTION
select OLD_SIGSUSPEND
select ARCH_HAS_SG_CHAIN
+ select CPU_BIG_ENDIAN
config SPARC32
def_bool !64BIT
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 7fcd492..e042479 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -27,6 +27,8 @@ config TILE
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select HAVE_DEBUG_STACKOVERFLOW
select ARCH_WANT_FRAME_POINTERS
+ select CPU_BIG_ENDIAN if __BUILDING_TIME_BIG_ENDIAN__
+ select CPU_LITTLE_ENDIAN if !CPU_BIG_ENDIAN
# FIXME: investigate whether we need/want these options.
# select HAVE_IOREMAP_PROT
diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index 6915d28..f696ec2 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -8,6 +8,8 @@ config UML
select GENERIC_IO
select GENERIC_CLOCKEVENTS
select TTY # Needed for line.c
+ select CPU_BIG_ENDIAN if __BUILDING_TIME_BIG_ENDIAN__
+ select CPU_LITTLE_ENDIAN if !CPU_BIG_ENDIAN
config MMU
bool
diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 928237a..02be244 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig
@@ -18,6 +18,7 @@ config UNICORE32
select ARCH_WANT_FRAME_POINTERS
select GENERIC_IOMAP
select MODULES_USE_ELF_REL
+ select CPU_LITTLE_ENDIAN
help
UniCore-32 is 32-bit Instruction Set Architecture,
including a series of low-power-consumption RISC chip
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1164b7d..9b83e33 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -136,6 +136,7 @@ config X86
select HAVE_ACPI_APEI if ACPI
select HAVE_ACPI_APEI_NMI if ACPI
select ACPI_LEGACY_TABLES_LOOKUP if ACPI
+ select CPU_LITTLE_ENDIAN
config INSTRUCTION_DECODER
def_bool y
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 3a617af..a3e8f7e 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -22,6 +22,8 @@ config XTENSA
select HAVE_IRQ_TIME_ACCOUNTING
select HAVE_PERF_EVENTS
select COMMON_CLK
+ select CPU_BIG_ENDIAN if __BUILDING_TIME_BIG_ENDIAN__
+ select CPU_LITTLE_ENDIAN if !CPU_BIG_ENDIAN
help
Xtensa processors are 32-bit RISC machines designed by Tensilica
primarily for embedded systems. These processors are both
diff --git a/init/Kconfig b/init/Kconfig
index 9565224..6dd3b20 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -23,6 +23,12 @@ config CONSTRUCTORS
config IRQ_WORK
bool
+config CPU_LITTLE_ENDIAN
+ bool
+
+config CPU_BIG_ENDIAN
+ bool
+
config BUILDTIME_EXTABLE_SORT
bool
--
1.7.11.7
--
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