【OLK-5.10】BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h

【严重程度】一般
【特性】 arm64架构/mpam
【重现类型】有条件必然重现
【定位分析】

该问题由<a class="ql-normal-link" href="

通过在当时复现的代码版本（可以选用de11d3a28cbdc (tag: 5.10.0-29.0.0) arm64: mm: support setting page attributes for debugging作为基线）增加以下代码可以构造必先用例：

diff --git a/arch/arm64/kernel/mpam/mpam_device.c b/arch/arm64/kernel/mpam/mpam_device.c

index f8840274b902f..794dee83337f3 100644

--- a/arch/arm64/kernel/mpam/mpam_device.c

+++ b/arch/arm64/kernel/mpam/mpam_device.c

@@ -529,6 +529,7 @@ static void mpam_disable_irqs(void)

}

+#include <linux/delay.h>

/*

* Enable mpam once all devices have been probed.

* Scheduled by mpam_discovery_complete() once all devices have been created.

@@ -596,6 +597,7 @@ static void __init mpam_enable(struct work_struct *work)

mpam_cpuhp_state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,

"mpam:online", mpam_cpu_online,

mpam_cpu_offline);

+ msleep(10000);

if (mpam_cpuhp_state <= 0)

pr_err("Failed to re-register 'dyn' cpuhp callbacks");

mutex_unlock(&mpam_cpuhp_lock);

复现现场：

因为当前mpam_enable已经被改成非init类型，因此只需要将原来的补丁回退即可。

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