Commit b2e2fe99 authored Dec 29, 2008 by Ingo Molnar

sparseirq: work around __weak alias bug



Impact: fix boot crash if the kernel is built with certain GCC versions

GCC has a bug with __weak alias functions: if the functions are in
the same compilation unit as their call site, GCC can decide to
inline them - and thus rob the linker of the opportunity to override
the weak alias with the real thing.

This can lead to the boot crash reported by Kamalesh Babulal:

 ACPI: Core revision 20080926
 Setting APIC routing to flat
 BUG: unable to handle kernel NULL pointer dereference at
 0000000000000000
 IP: [<ffffffff8021f9a8>] add_pin_to_irq_cpu+0x14/0x74
 PGD 0
 Oops: 0000 [#1] SMP
 [...]

So move the arch_init_chip_data() function from handle.c to manage.c.

Reported-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 12026ea1

kernel/irq/handle.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -86,11 +86,6 @@ void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
		desc->kstat_irqs = (unsigned int *)ptr;
		}

		int __weak arch_init_chip_data(struct irq_desc *desc, int cpu)
		{
		return 0;
		}

		static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
		{
		memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));

kernel/irq/manage.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -261,6 +261,15 @@ void enable_irq(unsigned int irq)
		}
		EXPORT_SYMBOL(enable_irq);

		/*
		* [ Not in kernel/irq/handle.c, so that GCC does not
		* inline the __weak alias: ]
		*/
		int __weak arch_init_chip_data(struct irq_desc *desc, int cpu)
		{
		return 0;
		}

		static int set_irq_wake_real(unsigned int irq, unsigned int on)
		{
		struct irq_desc *desc = irq_to_desc(irq);