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From:   Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To:     Thomas Gleixner <tglx@linutronix.de>, x86@kernel.org
Cc:     Tony Luck <tony.luck@intel.com>, Andi Kleen <ak@linux.intel.com>,
        Stephane Eranian <eranian@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Joerg Roedel <joro@8bytes.org>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        Nicholas Piggin <npiggin@gmail.com>,
        "Ravi V. Shankar" <ravi.v.shankar@intel.com>,
        Ricardo Neri <ricardo.neri@intel.com>,
        iommu@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org,
        linux-kernel@vger.kernel.org,
        Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Subject: [PATCH v6 20/29] init/main: Delay initialization of the lockup detector after smp_init()
Date:   Thu,  5 May 2022 16:59:59 -0700
Message-Id: <20220506000008.30892-21-ricardo.neri-calderon@linux.intel.com>
In-Reply-To: <20220506000008.30892-1-ricardo.neri-calderon@linux.intel.com>
References: <20220506000008.30892-1-ricardo.neri-calderon@linux.intel.com>
Precedence: bulk

Certain implementations of the hardlockup detector require support for
Inter-Processor Interrupt shorthands. On x86, support for these can only
be determined after all the possible CPUs have booted once (in
smp_init()). Other architectures may not need such check.

lockup_detector_init() only performs the initializations of data
structures of the lockup detector. Hence, there are no dependencies on
smp_init().

Cc: Andi Kleen <ak@linux.intel.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: x86@kernel.org
Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
---
Changes since v5:
 * Introduced this patch

Changes since v4:
 * N/A

Changes since v3:
 * N/A

Changes since v2:
 * N/A

Changes since v1:
 * N/A
---
 init/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/init/main.c b/init/main.c
index 98182c3c2c4b..62c52c9e4c2b 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1600,9 +1600,11 @@ static noinline void __init kernel_init_freeable(void)
 
 	rcu_init_tasks_generic();
 	do_pre_smp_initcalls();
-	lockup_detector_init();
 
 	smp_init();
+
+	lockup_detector_init();
+
 	sched_init_smp();
 
 	padata_init();
-- 
2.17.1