Commit e9cbf629 authored Jun 09, 2016 by James Hogan Committed by Ralf Baechle Jul 24, 2016

MIPS: Fix MSA asm warnings in control reg accessors



Building an MSA capable kernel with a toolchain that supports MSA
produces warnings such as this:

  CC      arch/mips/kernel/cpu-probe.o
{standard input}: Assembler messages:
{standard input}:4786: Warning: the `msa' extension requires 64-bit FPRs

This is due to ".set msa" without ".set fp=64" in the inline assembly of
control register accessors, since MSA requires the 64-bit FPU registers
(FR=1). Add the missing fp=64 in these functions to silence the
warnings.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13554/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent 7bf0d5e8

arch/mips/include/asm/msa.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -168,6 +168,7 @@ static inline unsigned int read_msa_##name(void) \
		unsigned int reg; \
		__asm__ __volatile__( \
		" .set push\n" \
		" .set fp=64\n" \
		" .set msa\n" \
		" cfcmsa %0, $" #cs "\n" \
		" .set pop\n" \
		@@ -179,6 +180,7 @@ static inline void write_msa_##name(unsigned int val) \
		{ \
		__asm__ __volatile__( \
		" .set push\n" \
		" .set fp=64\n" \
		" .set msa\n" \
		" ctcmsa $" #cs ", %0\n" \
		" .set pop\n" \