提交 13a0c3c2 编写于 作者: Y Yinghai Lu 提交者: Ingo Molnar

sparseirq: work around compiler optimizing away __weak functions

Impact: fix panic on null pointer with sparseirq

Some GCC versions seem to inline the weak global function,
when that function is empty.

Work it around, by making the functions return a (dummy) integer.
Signed-off-by: NYinghai <yinghai@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
上级 793f7b12
......@@ -170,7 +170,7 @@ static struct irq_cfg irq_cfgx[NR_IRQS] = {
[15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
};
void __init arch_early_irq_init(void)
int __init arch_early_irq_init(void)
{
struct irq_cfg *cfg;
struct irq_desc *desc;
......@@ -184,6 +184,8 @@ void __init arch_early_irq_init(void)
desc = irq_to_desc(i);
desc->chip_data = &cfg[i];
}
return 0;
}
#ifdef CONFIG_SPARSE_IRQ
......@@ -212,7 +214,7 @@ static struct irq_cfg *get_one_free_irq_cfg(int cpu)
return cfg;
}
void arch_init_chip_data(struct irq_desc *desc, int cpu)
int arch_init_chip_data(struct irq_desc *desc, int cpu)
{
struct irq_cfg *cfg;
......@@ -224,6 +226,8 @@ void arch_init_chip_data(struct irq_desc *desc, int cpu)
BUG_ON(1);
}
}
return 0;
}
#ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
......
......@@ -193,9 +193,9 @@ struct irq_desc {
const char *name;
} ____cacheline_internodealigned_in_smp;
extern void early_irq_init(void);
extern void arch_early_irq_init(void);
extern void arch_init_chip_data(struct irq_desc *desc, int cpu);
extern int early_irq_init(void);
extern int arch_early_irq_init(void);
extern int arch_init_chip_data(struct irq_desc *desc, int cpu);
extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
struct irq_desc *desc, int cpu);
extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
......
......@@ -539,13 +539,14 @@ void __init __weak thread_info_cache_init(void)
{
}
void __init __weak arch_early_irq_init(void)
int __init __weak arch_early_irq_init(void)
{
return 0;
}
void __init __weak early_irq_init(void)
int __init __weak early_irq_init(void)
{
arch_early_irq_init();
return arch_early_irq_init();
}
asmlinkage void __init start_kernel(void)
......
......@@ -86,8 +86,9 @@ void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
desc->kstat_irqs = (unsigned int *)ptr;
}
void __attribute__((weak)) arch_init_chip_data(struct irq_desc *desc, int cpu)
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)
......@@ -132,7 +133,7 @@ static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_sm
/* FIXME: use bootmem alloc ...*/
static unsigned int kstat_irqs_legacy[NR_IRQS_LEGACY][NR_CPUS];
void __init early_irq_init(void)
int __init early_irq_init(void)
{
struct irq_desc *desc;
int legacy_count;
......@@ -151,7 +152,7 @@ void __init early_irq_init(void)
for (i = legacy_count; i < NR_IRQS; i++)
irq_desc_ptrs[i] = NULL;
arch_early_irq_init();
return arch_early_irq_init();
}
struct irq_desc *irq_to_desc(unsigned int irq)
......
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