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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>
hifive-unleashed-5.1
James Hogan 2016-06-09 13:13:04 +01:00 committed by Ralf Baechle
parent 7bf0d5e8e6
commit e9cbf6299e
1 changed files with 2 additions and 0 deletions
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2
arch/mips/include/asm/msa.h
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@ -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" \