ARM: 8452/3: PJ4: make coprocessor access sequences buildable in Thumb2 mode

The PJ4 inline asm sequence to write to cp15 cannot be built in Thumb-2
mode, due to the way it performs arithmetic on the program counter, so it
is built in ARM mode instead. However, building C files in ARM mode under
CONFIG_THUMB2_KERNEL is problematic, since the instrumentation performed
by subsystems like ftrace does not expect having to deal with interworking
branches.

Since the sequence in question is simply a poor man's ISB instruction,
let's use a straight 'isb' instead when building in Thumb2 mode. Thumb2
implies V7, so 'isb' should always be supported in that case.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index af9e59bf3831b9fd648d095c2070209b1e97677d..3c789496297f3879ce3b39b0a1c151a7f7f7d0cf 100644 (file)
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -73,7 +73,6 @@ obj-$(CONFIG_IWMMXT)          += iwmmxt.o
 obj-$(CONFIG_PERF_EVENTS)      += perf_regs.o perf_callchain.o
 obj-$(CONFIG_HW_PERF_EVENTS)   += perf_event_xscale.o perf_event_v6.o \
                                   perf_event_v7.o
-CFLAGS_pj4-cp0.o               := -marm
 AFLAGS_iwmmxt.o                        := -Wa,-mcpu=iwmmxt
 obj-$(CONFIG_ARM_CPU_TOPOLOGY)  += topology.o
 obj-$(CONFIG_VDSO)             += vdso.o

diff --git a/arch/arm/kernel/pj4-cp0.c b/arch/arm/kernel/pj4-cp0.c
index 8153e36b24917e96c8fa69d18bd78e8b0c130c1a..7c9248b74d3f41548e5ce41d614dc8850d08aa94 100644 (file)
--- a/arch/arm/kernel/pj4-cp0.c
+++ b/arch/arm/kernel/pj4-cp0.c
@@ -66,9 +66,13 @@ static void __init pj4_cp_access_write(u32 value)
 
        __asm__ __volatile__ (
                "mcr    p15, 0, %1, c1, c0, 2\n\t"
+#ifdef CONFIG_THUMB2_KERNEL
+               "isb\n\t"
+#else
                "mrc    p15, 0, %0, c1, c0, 2\n\t"
                "mov    %0, %0\n\t"
                "sub    pc, pc, #4\n\t"
+#endif
                : "=r" (temp) : "r" (value));
 }