Attachment 159731 Details for Bug 249105 – Kernel fix.

[patch] Kernel fix.

linux-acpi-without-cpus.patch (text/plain), 988 bytes, created by Jan Kratochvil on 2007-07-21 20:36:35 UTC

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Creator: Jan Kratochvil

Created: 2007-07-21 20:36:35 UTC

Size: 988 bytes

patch

obsolete

>[PATCH 2.6.23-0.35.rc0.git6.fc7 1/1] acpi: Fix Oops in QEMU (ACPI with no CPUs)
>
>qemu-0.9.0 provides ACPI for the guest OS but without any CPU type nodes.
>Kernel would crash with:
>	Unable to handle kernel NULL pointer dereference at 0000000000000018 RIP: 
>	 [<ffffffff81167181>] acpi_idle_init+0x17/0x110
>due to
>	processors[cpu] == NULL
>
>With the patch it will skip the initialization and report instead:
>	cpuidle: driver acpi_idle failed to attach to cpu 0
>
>Signed-off-by: Jan Kratochvil <jan.kratochvil@redhat.com>
>
>--- linux-2.6.22.x86_64/drivers/acpi/processor_idle.c-orig	2007-07-21 09:08:25.000000000 +0200
>+++ linux-2.6.22.x86_64/drivers/acpi/processor_idle.c	2007-07-21 22:25:58.000000000 +0200
>@@ -1064,6 +1064,10 @@ static int acpi_idle_init(struct cpuidle
> 
> 	struct acpi_processor *pr = processors[cpu];
> 
>+	/* ACPI may exist but it does not have to provide any CPU type nodes. */
>+	if (pr == NULL)
>+		return -EINVAL;
>+
> 	if (!pr->flags.power_setup_done)
> 		return -EINVAL;
>

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Attachments on bug 249105: 159731