From: Thomas Gleixner <tglx@linutronix.de>
To: Zhang Rui <rui.zhang@intel.com>,
peterz@infradead.org, bp@alien8.de, rafael.j.wysocki@intel.com
Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
x86@kernel.org, feng.tang@intel.com
Subject: Re: [RFC PATCH] x86/acpi: Ignore invalid x2APIC entries
Date: Fri, 28 Jul 2023 14:51:48 +0200 [thread overview]
Message-ID: <87jzukqjvf.ffs@tglx> (raw)
In-Reply-To: <20230702162802.344176-1-rui.zhang@intel.com>
On Mon, Jul 03 2023 at 00:28, Zhang Rui wrote:
>
> +static bool has_lapic_cpus;
Yet another random flag. Sigh.
I really hate this. Why not doing the obvious?
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2452,6 +2452,9 @@ int generic_processor_info(int apicid, i
bool boot_cpu_detected = physid_isset(boot_cpu_physical_apicid,
phys_cpu_present_map);
+ if (physid_isset(apicid, phys_cpu_present_map))
+ return -EBUSY;
+
/*
* boot_cpu_physical_apicid is designed to have the apicid
* returned by read_apic_id(), i.e, the apicid of the
As the call sites during MADT parsing ignore the return value anyway,
there is no harm and this is a proper defense against broken tables
which enumerate an APIC twice.
Thanks,
tglx
next prev parent reply other threads:[~2023-07-28 12:51 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-02 16:28 [RFC PATCH] x86/acpi: Ignore invalid x2APIC entries Zhang Rui
2023-07-28 12:51 ` Thomas Gleixner [this message]
2023-07-28 12:55 ` Thomas Gleixner
2023-07-28 16:47 ` Zhang, Rui
2023-07-29 7:07 ` Thomas Gleixner
2023-07-31 13:04 ` Zhang, Rui
2023-11-09 13:41 ` [tip: x86/urgent] " tip-bot2 for Zhang Rui
2023-11-22 22:17 ` [PATCH] platform/x86: intel_telemetry: Fix kernel doc descriptions John Sperbeck
2023-11-22 22:18 ` [tip: x86/urgent] x86/acpi: Ignore invalid x2APIC entries John Sperbeck
2023-11-22 22:19 ` John Sperbeck
2023-11-23 12:50 ` Zhang, Rui
2023-12-01 3:25 ` Ashok Raj
2023-12-01 18:08 ` Zhang, Rui
2023-12-01 20:23 ` Ashok Raj
2023-12-02 2:53 ` Zhang, Rui
2023-12-01 8:31 ` Zhang, Rui
2023-12-01 23:32 ` John Sperbeck
2023-12-06 6:58 ` Andres Freund
2023-12-07 2:41 ` Zhang, Rui
2023-12-07 5:10 ` Andres Freund
2023-12-12 17:34 ` Thomas Gleixner
2023-12-13 7:39 ` Zhang, Rui
2023-12-13 14:51 ` Thomas Gleixner
2023-12-14 15:00 ` Zhang, Rui
2023-12-14 21:11 ` Thomas Gleixner
2023-12-15 14:19 ` [PATCH] x86/acpi: Handle bogus MADT APIC tables gracefully Thomas Gleixner
2023-12-15 14:20 ` [tip: x86/urgent] x86/acpi: Ignore invalid x2APIC entries Andres Freund
2023-12-10 11:47 ` Linux regression tracking (Thorsten Leemhuis)
2023-12-18 13:57 ` [tip: x86/urgent] x86/acpi: Handle bogus MADT APIC tables gracefully tip-bot2 for Thomas Gleixner
2024-10-10 21:31 ` [RFC PATCH] x86/acpi: Ignore invalid x2APIC entries Jim Mattson
2024-10-11 1:37 ` Zhang, Rui
2024-10-11 3:05 ` Jim Mattson
2024-10-14 13:05 ` Zhang, Rui
2024-10-14 18:00 ` Jim Mattson
2024-10-15 3:23 ` Zhang, Rui
2024-10-15 13:26 ` Jim Mattson
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