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riscv_percpu: Replace critical section with irqsave/irqrestore

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Since the SCRATCH register is used to store the percpu pointer,
which should not be accessed by other CPUs, we can replace the
critical section with irqsave/irqrestore.

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
This commit is contained in:
Huang Qi 2024-12-10 14:09:37 +08:00 committed by Xiang Xiao
parent fce4f2b3ee
commit de5151c64b
1 changed files with 4 additions and 4 deletions
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8
arch/risc-v/src/common/riscv_percpu.c
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@ -222,14 +222,14 @@ void riscv_percpu_set_kstack(uintptr_t ksp)
/* This must be done with interrupts disabled */
flags = enter_critical_section();
flags = up_irq_save();
scratch = READ_CSR(CSR_SCRATCH);
DEBUGASSERT(scratch >= (uintptr_t) &g_percpu &&
scratch < (uintptr_t) &g_percpu + sizeof(g_percpu));
((riscv_percpu_t *)scratch)->ksp = ksp;
leave_critical_section(flags);
up_irq_restore(flags);
}
/****************************************************************************
@ -254,12 +254,12 @@ void riscv_percpu_set_thread(struct tcb_s *tcb)
/* This must be done with interrupts disabled */
flags = enter_critical_section();
flags = up_irq_save();
scratch = READ_CSR(CSR_SCRATCH);
DEBUGASSERT(scratch >= (uintptr_t) &g_percpu &&
scratch < (uintptr_t) &g_percpu + sizeof(g_percpu));
((riscv_percpu_t *)scratch)->tcb = tcb;
leave_critical_section(flags);
up_irq_restore(flags);
}