hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I82QPR -------------------------------- On Kunpeng920 platform, when firmware triggers SDEI event too soon, A WARN_ON() will be called in sdei_watchdog_callback(), this leads to warning "sdei: unsafe: exception during handler" being reported in _sdei_handler(). As the comments for the warning mentioned, We took a synchronous exception from the SDEI handler. This could deadlock, and if you interrupt KVM it will hyp-panic instead. Remove the WARN_ON() to avoid potential issue and warning. Fixes: 0fa83fd0f8f7 ("sdei_watchdog: avoid possible false hardlockup") Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- arch/arm64/kernel/watchdog_sdei.c | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/arm64/kernel/watchdog_sdei.c b/arch/arm64/kernel/watchdog_sdei.c index aa980b090598..7fd8c2d3dd1b 100644 --- a/arch/arm64/kernel/watchdog_sdei.c +++ b/arch/arm64/kernel/watchdog_sdei.c @@ -78,7 +78,6 @@ static int sdei_watchdog_callback(u32 event, if (delta < watchdog_thresh * (u64)NSEC_PER_SEC * 4 / 5) { pr_err(FW_BUG "SDEI Watchdog event triggered too soon, " "time to last check:%lld ns\n", delta); - WARN_ON(1); return 0; } -- 2.20.1