Messages in this thread Patch in this message | | | From | Xiongfeng Wang <> | Subject | [RFC PATCH 3/3] stop_machine: mask sdei before running the callback | Date | Fri, 12 Apr 2019 20:04:59 +0800 |
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Kprobes use 'stop_machine' to modify code which could be run in the sdei event handler at the same time. This patch mask sdei before running the stop_machine callback to avoid this race condition.
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com> --- kernel/stop_machine.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index 067cb83..7b95632 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -22,6 +22,9 @@ #include <linux/atomic.h> #include <linux/nmi.h> #include <linux/sched/wake_q.h> +#ifdef CONFIG_ARM64 +#include <linux/arm_sdei.h> +#endif /* * Structure to determine completion condition and record errors. May @@ -208,6 +211,9 @@ static int multi_cpu_stop(void *data) case MULTI_STOP_DISABLE_IRQ: local_irq_disable(); hard_irq_disable(); +#ifdef CONFIG_ARM64 + sdei_mask_local_cpu(); +#endif break; case MULTI_STOP_RUN: if (is_active) @@ -227,6 +233,9 @@ static int multi_cpu_stop(void *data) } } while (curstate != MULTI_STOP_EXIT); +#ifdef CONFIG_ARM64 + sdei_unmask_local_cpu(); +#endif local_irq_restore(flags); return err; } -- 1.7.12.4
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