diff options
| author | Paul Burton <paul.burton@imgtec.com> | 2015-08-03 18:49:30 +0300 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-09-03 13:08:05 +0300 |
| commit | 1a3d59579b9f436da038f377309cf2270c76318e (patch) | |
| tree | 3a7c9ca24e6826642d414bfd6750d94c4eefacb6 /arch/mips/include/asm/fpu.h | |
| parent | 23eb6f4016758b756b54704b359e3c51d425d6ab (diff) | |
| download | linux-1a3d59579b9f436da038f377309cf2270c76318e.tar.xz | |
MIPS: Tidy up FPU context switching
Rather than saving the scalar FP or vector context in the assembly
resume function, reuse the existing C code we have in fpu.h to do
exactly that. This reduces duplication, results in a much easier to read
resume function & should allow the compiler to optimise out more MSA
code due to is_msa_enabled()/cpu_has_msa being known-zero at compile
time for kernels without MSA support.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-kernel@vger.kernel.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Manuel Lauss <manuel.lauss@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/10830/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/fpu.h')
| -rw-r--r-- | arch/mips/include/asm/fpu.h | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/arch/mips/include/asm/fpu.h b/arch/mips/include/asm/fpu.h index 1b0625189835..9cbf383b8834 100644 --- a/arch/mips/include/asm/fpu.h +++ b/arch/mips/include/asm/fpu.h @@ -164,25 +164,30 @@ static inline int own_fpu(int restore) return ret; } -static inline void lose_fpu(int save) +static inline void lose_fpu_inatomic(int save, struct task_struct *tsk) { - preempt_disable(); if (is_msa_enabled()) { if (save) { - save_msa(current); - current->thread.fpu.fcr31 = + save_msa(tsk); + tsk->thread.fpu.fcr31 = read_32bit_cp1_register(CP1_STATUS); } disable_msa(); - clear_thread_flag(TIF_USEDMSA); + clear_tsk_thread_flag(tsk, TIF_USEDMSA); __disable_fpu(); } else if (is_fpu_owner()) { if (save) - _save_fp(current); + _save_fp(tsk); __disable_fpu(); } - KSTK_STATUS(current) &= ~ST0_CU1; - clear_thread_flag(TIF_USEDFPU); + KSTK_STATUS(tsk) &= ~ST0_CU1; + clear_tsk_thread_flag(tsk, TIF_USEDFPU); +} + +static inline void lose_fpu(int save) +{ + preempt_disable(); + lose_fpu_inatomic(save, current); preempt_enable(); } |