[PATCH] arm fix for kernel with Realtime Preempt patch

[Luotao Fu <l.fu@pengutronix.de>]

Hi,
Here is a patch to fix Compliation error while compling the kernel with
the Realtime Preemption patch for arm with the latency tracer turned on.

The Errormessage (compiled with gcc4.2.0) is also attached to this mail. 

The patch attachs __sched to the function calls compat_sem_is_locked()
and __compat_down_trylock() for arm. So that the calls will be put in
the section .sched.text, as declared later in the asm code.

Regards
Luotao Fu
-- 
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arm-v4t-linux-gnueabi-gcc -Wp,-MD,arch/arm/kernel/.semaphore.o.d  -nostdinc -isystem /opt/OSELAS.Toolchain-trunk/arm-v4t-linux-gnueabi/gcc-4.2-20061014-glibc-2.5/lib/gcc/arm-v4t-linux-gnueabi/4.2.0/include -D__KERNEL__ -Iinclude  -include include/linux/autoconf.h -mlittle-endian -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Os -fno-omit-frame-pointer -mapcs -mno-sched-prolog -mabi=aapcs-linux -mno-thumb-interwork -D__LINUX_ARM_ARCH__=4 -march=armv4t -mtune=arm9tdmi  -msoft-float -Uarm -pg -fno-omit-frame-pointer -fno-optimize-sibling-calls -g  -fno-stack-protector -Wdeclaration-after-statement -Wno-pointer-sign    -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(semaphore)"  -D"KBUILD_MODNAME=KBUILD_STR(semaphore)" -c -o arch/arm/kernel/semaphore.o arch/arm/kernel/semaphore.c
Using built-in specs.
Target: arm-v4t-linux-gnueabi
Configured with: /home/mkl/pengutronix/ptxdist/build/OSELAS.Toolchain-trunk-gcc-4.2/build-cross/gcc-4.2-20061014/configure --host=i686-host-linux-gnu --target=arm-v4t-linux-gnueabi --prefix=/opt/OSELAS.Toolchain-trunk/arm-v4t-linux-gnueabi/gcc-4.2-20061014-glibc-2.5 --with-sysroot=/opt/OSELAS.Toolchain-trunk/arm-v4t-linux-gnueabi/gcc-4.2-20061014-glibc-2.5/sysroot-arm-v4t-linux-gnueabi --with-arch=armv4t --with-float=soft --with-fpu=vfp --disable-nls --enable-symvers=gnu --enable-__cxa_atexit --disable-multilib --disable-shared --enable-threads=no --enable-languages=c
Thread model: single
gcc version 4.2.0 20061014 (experimental)
 /opt/OSELAS.Toolchain-trunk/arm-v4t-linux-gnueabi/gcc-4.2-20061014-glibc-2.5/libexec/gcc/arm-v4t-linux-gnueabi/4.2.0/cc1 -E -quiet -nostdinc -v -Iinclude -D__KERNEL__ -D__LINUX_ARM_ARCH__=4 -Uarm -DKBUILD_STR(s)=#s -DKBUILD_BASENAME=KBUILD_STR(semaphore) -DKBUILD_MODNAME=KBUILD_STR(semaphore) -isystem /opt/OSELAS.Toolchain-trunk/arm-v4t-linux-gnueabi/gcc-4.2-20061014-glibc-2.5/lib/gcc/arm-v4t-linux-gnueabi/4.2.0/include -include include/linux/autoconf.h -MD arch/arm/kernel/.semaphore.o.d arch/arm/kernel/semaphore.c -mlittle-endian -mapcs -mno-sched-prolog -mabi=aapcs-linux -mno-thumb-interwork -march=armv4t -mtune=arm9tdmi -msoft-float -mfpu=vfp -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-aliasing -fno-common -fno-omit-frame-pointer -fno-optimize-sibling-calls -fno-stack-protector -fworking-directory -Os -fpch-preprocess -o semaphore.i
#include "..." search starts here:
#include <...> search starts here:
 include
 /opt/OSELAS.Toolchain-trunk/arm-v4t-linux-gnueabi/gcc-4.2-20061014-glibc-2.5/lib/gcc/arm-v4t-linux-gnueabi/4.2.0/include
End of search list.
 /opt/OSELAS.Toolchain-trunk/arm-v4t-linux-gnueabi/gcc-4.2-20061014-glibc-2.5/libexec/gcc/arm-v4t-linux-gnueabi/4.2.0/cc1 -fpreprocessed semaphore.i -quiet -dumpbase semaphore.c -mlittle-endian -mapcs -mno-sched-prolog -mabi=aapcs-linux -mno-thumb-interwork -march=armv4t -mtune=arm9tdmi -msoft-float -mfpu=vfp -auxbase-strip arch/arm/kernel/semaphore.o -g -Os -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -Wdeclaration-after-statement -Wno-pointer-sign -version -p -fno-strict-aliasing -fno-common -fno-omit-frame-pointer -fno-optimize-sibling-calls -fno-stack-protector -o semaphore.s
GNU C version 4.2.0 20061014 (experimental) (arm-v4t-linux-gnueabi)
	compiled by GNU C version 4.1.2 20060901 (prerelease) (Debian 4.1.1-13).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: f57ff329f13f8db743e62d0546825ac4
 /opt/OSELAS.Toolchain-trunk/arm-v4t-linux-gnueabi/gcc-4.2-20061014-glibc-2.5/lib/gcc/arm-v4t-linux-gnueabi/4.2.0/../../../../arm-v4t-linux-gnueabi/bin/as -EL -march=armv4t -mfloat-abi=soft -mfpu=vfp -meabi=4 -o arch/arm/kernel/semaphore.o semaphore.s
semaphore.s: Assembler messages:
semaphore.s:733: Error: can't resolve `.text' {.text section} - `.LFB403' {.sched.text section}















Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Luotao Fu <lfu@pengutronix.de>

--- linux-2.6.18-rt5/arch/arm/kernel/semaphore.c	2006-10-16 19:40:16.000000000 +0200
+++ linux-2.6.18-rt5-fix/arch/arm/kernel/semaphore.c	2006-10-16 19:33:48.000000000 +0200
@@ -154,7 +154,7 @@
  * single "cmpxchg" without failure cases,
  * but then it wouldn't work on a 386.
  */
-fastcall int __attribute_used__ __compat_down_trylock(struct compat_semaphore * sem)
+fastcall int __attribute_used__ __sched __compat_down_trylock(struct compat_semaphore * sem)
 {
 	int sleepers;
 	unsigned long flags;
@@ -176,7 +176,7 @@
 
 EXPORT_SYMBOL(__compat_down_trylock);
 
-fastcall int compat_sem_is_locked(struct compat_semaphore *sem)
+fastcall int __sched compat_sem_is_locked(struct compat_semaphore *sem)
 {
 	return (int) atomic_read(&sem->count) < 0;
 }

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