RISC-V: Add _TIF_NEED_RESCHED check for kernel thread when CONFIG_PREEMPT=y

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The cond_resched() can be used to yield the CPU resource if
CONFIG_PREEMPT is not defined. Otherwise, cond_resched() is a dummy
function. In order to avoid kernel thread occupying entire CPU,
when CONFIG_PREEMPT=y, the kernel thread needs to follow the
rescheduling mechanism like a user thread.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

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Vincent Chen 2019-01-03 11:32:33 +08:00 • committed by Palmer Dabbelt

parent 49a57857ae

commit 99fd6e875d

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2 changed files with 18 additions and 1 deletions

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1

arch/riscv/kernel/asm-offsets.c

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18

arch/riscv/kernel/entry.S

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