diff options
| -rw-r--r-- | Documentation/x86/x86_64/kernel-stacks | 6 | ||||
| -rw-r--r-- | arch/x86/Kconfig.debug | 3 | ||||
| -rw-r--r-- | arch/x86/include/asm/irq.h | 12 | ||||
| -rw-r--r-- | arch/x86/kernel/irq_32.c | 6 |
4 files changed, 9 insertions, 18 deletions
diff --git a/Documentation/x86/x86_64/kernel-stacks b/Documentation/x86/x86_64/kernel-stacks index 5ad65d51fb9..a01eec5d1d0 100644 --- a/Documentation/x86/x86_64/kernel-stacks +++ b/Documentation/x86/x86_64/kernel-stacks @@ -18,9 +18,9 @@ specialized stacks contain no useful data. The main CPU stacks are: Used for external hardware interrupts. If this is the first external hardware interrupt (i.e. not a nested hardware interrupt) then the kernel switches from the current task to the interrupt stack. Like - the split thread and interrupt stacks on i386 (with CONFIG_4KSTACKS), - this gives more room for kernel interrupt processing without having - to increase the size of every per thread stack. + the split thread and interrupt stacks on i386, this gives more room + for kernel interrupt processing without having to increase the size + of every per thread stack. The interrupt stack is also used when processing a softirq. diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 75085080b63..badda8e20e7 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -128,8 +128,7 @@ config 4KSTACKS If you say Y here the kernel will use a 4Kb stacksize for the kernel stack attached to each process/thread. This facilitates running more threads on a system and also reduces the pressure - on the VM subsystem for higher order allocations. This option - will also use IRQ stacks to compensate for the reduced stackspace. + on the VM subsystem for higher order allocations. config DOUBLEFAULT default y diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h index 5458380b6ef..0bf5b008365 100644 --- a/arch/x86/include/asm/irq.h +++ b/arch/x86/include/asm/irq.h @@ -19,18 +19,16 @@ static inline int irq_canonicalize(int irq) # define ARCH_HAS_NMI_WATCHDOG #endif -#ifdef CONFIG_4KSTACKS - extern void irq_ctx_init(int cpu); - extern void irq_ctx_exit(int cpu); -# define __ARCH_HAS_DO_SOFTIRQ +#ifdef CONFIG_X86_32 +extern void irq_ctx_init(int cpu); +extern void irq_ctx_exit(int cpu); #else # define irq_ctx_init(cpu) do { } while (0) # define irq_ctx_exit(cpu) do { } while (0) -# ifdef CONFIG_X86_64 -# define __ARCH_HAS_DO_SOFTIRQ -# endif #endif +#define __ARCH_HAS_DO_SOFTIRQ + #ifdef CONFIG_HOTPLUG_CPU #include <linux/cpumask.h> extern void fixup_irqs(void); diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c index 10709f29d16..67f5f9f5299 100644 --- a/arch/x86/kernel/irq_32.c +++ b/arch/x86/kernel/irq_32.c @@ -49,7 +49,6 @@ static inline int check_stack_overflow(void) { return 0; } static inline void print_stack_overflow(void) { } #endif -#ifdef CONFIG_4KSTACKS /* * per-CPU IRQ handling contexts (thread information and stack) */ @@ -187,11 +186,6 @@ asmlinkage void do_softirq(void) local_irq_restore(flags); } -#else -static inline int -execute_on_irq_stack(int overflow, struct irq_desc *desc, int irq) { return 0; } -#endif - bool handle_irq(unsigned irq, struct pt_regs *regs) { struct irq_desc *desc; |