[PATCH 3.16.y-ckt 047/170] MIPS: ftrace: Fix a microMIPS build problem

From: Luis Henriques
Date: Tue Nov 11 2014 - 06:58:51 EST


3.16.7-ckt1 -stable review patch. If anyone has any objections, please let me know.

------------------

From: Markos Chandras <markos.chandras@xxxxxxxxxx>

commit aedd153f5bb5b1f1d6d9142014f521ae2ec294cc upstream.

Code before the .fixup section needs to have the .insn directive.
This has no side effects on MIPS32/64 but it affects the way microMIPS
loads the address for the return label.

Fixes the following build problem:
mips-linux-gnu-ld: arch/mips/built-in.o: .fixup+0x4a0: Unsupported jump between
ISA modes; consider recompiling with interlinking enabled.
mips-linux-gnu-ld: final link failed: Bad value
Makefile:819: recipe for target 'vmlinux' failed

The fix is similar to 1658f914ff91c3bf ("MIPS: microMIPS:
Disable LL/SC and fix linker bug.")

Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/8117/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
arch/mips/include/asm/ftrace.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/mips/include/asm/ftrace.h b/arch/mips/include/asm/ftrace.h
index 992aaba603b5..b463f2aa5a61 100644
--- a/arch/mips/include/asm/ftrace.h
+++ b/arch/mips/include/asm/ftrace.h
@@ -24,7 +24,7 @@ do { \
asm volatile ( \
"1: " load " %[tmp_dst], 0(%[tmp_src])\n" \
" li %[tmp_err], 0\n" \
- "2:\n" \
+ "2: .insn\n" \
\
".section .fixup, \"ax\"\n" \
"3: li %[tmp_err], 1\n" \
@@ -46,7 +46,7 @@ do { \
asm volatile ( \
"1: " store " %[tmp_src], 0(%[tmp_dst])\n"\
" li %[tmp_err], 0\n" \
- "2:\n" \
+ "2: .insn\n" \
\
".section .fixup, \"ax\"\n" \
"3: li %[tmp_err], 1\n" \
--
2.1.0

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