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| author | Alan Kao <alankao@andestech.com> | 2018-10-09 04:18:33 +0200 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@sifive.com> | 2018-10-23 02:02:23 +0200 |
| commit | 9671f7061433e2c58b9894093eada1898595b85d (patch) | |
| tree | 29630911728d35d4aac5b6dd08c2b96947a70d01 /arch/riscv/kernel/process.c | |
| parent | Cleanup ISA string setting (diff) | |
| download | linux-9671f7061433e2c58b9894093eada1898595b85d.tar.xz linux-9671f7061433e2c58b9894093eada1898595b85d.zip | |
Allow to disable FPU support
FPU codes have been separated from common part in previous patches.
This patch add the CONFIG_FPU option and some stubs, so that a no-FPU
configuration is allowed.
Signed-off-by: Alan Kao <alankao@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>
Cc: Vincent Chen <vincentc@andestech.com>
Cc: Zong Li <zong@andestech.com>
Cc: Nick Hu <nickhu@andestech.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Diffstat (limited to 'arch/riscv/kernel/process.c')
| -rw-r--r-- | arch/riscv/kernel/process.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c index d7c6ca7c95ae..07d515655aa9 100644 --- a/arch/riscv/kernel/process.c +++ b/arch/riscv/kernel/process.c @@ -76,7 +76,7 @@ void show_regs(struct pt_regs *regs) void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp) { - regs->sstatus = SR_SPIE /* User mode, irqs on */ | SR_FS_INITIAL; + regs->sstatus = DEFAULT_SSTATUS; regs->sepc = pc; regs->sp = sp; set_fs(USER_DS); @@ -84,12 +84,14 @@ void start_thread(struct pt_regs *regs, unsigned long pc, void flush_thread(void) { +#ifdef CONFIG_FPU /* * Reset FPU context * frm: round to nearest, ties to even (IEEE default) * fflags: accrued exceptions cleared */ memset(¤t->thread.fstate, 0, sizeof(current->thread.fstate)); +#endif } int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) |