From: Samuel Holland samuel@sholland.org
stable inclusion from stable-v5.10.121 commit d2f3acde3d52b3b351db09e2e2a5e5812eda2735 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6CQ
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 2273272823db6f67d57761df8116ae32e7f05bed upstream.
irq_work is triggered via an IPI, but the IPI infrastructure is not included in uniprocessor kernels. As a result, irq_work never runs. Fall back to the tick-based irq_work implementation on uniprocessor configurations.
Fixes: 298447928bb1 ("riscv: Support irq_work via self IPIs") Signed-off-by: Samuel Holland samuel@sholland.org Reviewed-by: Heiko Stuebner heiko@sntech.de Link: https://lore.kernel.org/r/20220430030025.58405-1-samuel@sholland.org Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com --- arch/riscv/include/asm/irq_work.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/include/asm/irq_work.h b/arch/riscv/include/asm/irq_work.h index d6c277992f76..b53891964ae0 100644 --- a/arch/riscv/include/asm/irq_work.h +++ b/arch/riscv/include/asm/irq_work.h @@ -4,7 +4,7 @@
static inline bool arch_irq_work_has_interrupt(void) { - return true; + return IS_ENABLED(CONFIG_SMP); } extern void arch_irq_work_raise(void); #endif /* _ASM_RISCV_IRQ_WORK_H */