diff options
author | Christoph Hellwig <hch@lst.de> | 2010-06-02 22:24:26 +0000 |
---|---|---|
committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-06-15 15:02:37 +1000 |
commit | f1ba9a5b2ab7d3f5a910d93371c4f22b636b7683 (patch) | |
tree | 027523e8302d0851acd8e472acff9c81030abc94 /arch | |
parent | b636f1379eefe6eba931deaa386605bc7ac623e7 (diff) | |
download | kernel_samsung_smdk4412-f1ba9a5b2ab7d3f5a910d93371c4f22b636b7683.zip kernel_samsung_smdk4412-f1ba9a5b2ab7d3f5a910d93371c4f22b636b7683.tar.gz kernel_samsung_smdk4412-f1ba9a5b2ab7d3f5a910d93371c4f22b636b7683.tar.bz2 |
powerpc: Unconditionally enabled irq stacks
Irq stacks provide an essential protection from stack overflows through
external interrupts, at the cost of two additionals stacks per CPU.
Enable them unconditionally to simplify the kernel build and prevent
people from accidentally disabling them.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/powerpc/Kconfig.debug | 7 | ||||
-rw-r--r-- | arch/powerpc/include/asm/irq.h | 6 | ||||
-rw-r--r-- | arch/powerpc/kernel/irq.c | 12 | ||||
-rw-r--r-- | arch/powerpc/kernel/misc_32.S | 2 | ||||
-rw-r--r-- | arch/powerpc/kernel/misc_64.S | 2 | ||||
-rw-r--r-- | arch/powerpc/kernel/process.c | 5 | ||||
-rw-r--r-- | arch/powerpc/kernel/setup_32.c | 4 | ||||
-rw-r--r-- | arch/powerpc/kernel/setup_64.c | 4 |
8 files changed, 0 insertions, 42 deletions
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug index 53696da..2d38a50 100644 --- a/arch/powerpc/Kconfig.debug +++ b/arch/powerpc/Kconfig.debug @@ -135,13 +135,6 @@ config DEBUGGER depends on KGDB || XMON default y -config IRQSTACKS - bool "Use separate kernel stacks when processing interrupts" - help - If you say Y here the kernel will use separate kernel stacks - for handling hard and soft interrupts. This can help avoid - overflowing the process kernel stacks. - config VIRQ_DEBUG bool "Expose hardware/virtual IRQ mapping via debugfs" depends on DEBUG_FS diff --git a/arch/powerpc/include/asm/irq.h b/arch/powerpc/include/asm/irq.h index e054bae..ecba37a 100644 --- a/arch/powerpc/include/asm/irq.h +++ b/arch/powerpc/include/asm/irq.h @@ -358,7 +358,6 @@ extern void exc_lvl_ctx_init(void); #define exc_lvl_ctx_init() #endif -#ifdef CONFIG_IRQSTACKS /* * Per-cpu stacks for handling hard and soft interrupts. */ @@ -369,11 +368,6 @@ extern void irq_ctx_init(void); extern void call_do_softirq(struct thread_info *tp); extern int call_handle_irq(int irq, void *p1, struct thread_info *tp, void *func); -#else -#define irq_ctx_init() - -#endif /* CONFIG_IRQSTACKS */ - extern void do_IRQ(struct pt_regs *regs); #endif /* _ASM_IRQ_H */ diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 30817d9..3333bbd 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -317,7 +317,6 @@ void fixup_irqs(const struct cpumask *map) } #endif -#ifdef CONFIG_IRQSTACKS static inline void handle_one_irq(unsigned int irq) { struct thread_info *curtp, *irqtp; @@ -358,12 +357,6 @@ static inline void handle_one_irq(unsigned int irq) if (irqtp->flags) set_bits(irqtp->flags, &curtp->flags); } -#else -static inline void handle_one_irq(unsigned int irq) -{ - generic_handle_irq(irq); -} -#endif static inline void check_stack_overflow(void) { @@ -455,7 +448,6 @@ void exc_lvl_ctx_init(void) } #endif -#ifdef CONFIG_IRQSTACKS struct thread_info *softirq_ctx[NR_CPUS] __read_mostly; struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly; @@ -492,10 +484,6 @@ static inline void do_softirq_onstack(void) irqtp->task = NULL; } -#else -#define do_softirq_onstack() __do_softirq() -#endif /* CONFIG_IRQSTACKS */ - void do_softirq(void) { unsigned long flags; diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S index dc66d52..6bbd7a6 100644 --- a/arch/powerpc/kernel/misc_32.S +++ b/arch/powerpc/kernel/misc_32.S @@ -33,7 +33,6 @@ .text -#ifdef CONFIG_IRQSTACKS _GLOBAL(call_do_softirq) mflr r0 stw r0,4(r1) @@ -56,7 +55,6 @@ _GLOBAL(call_handle_irq) lwz r0,4(r1) mtlr r0 blr -#endif /* CONFIG_IRQSTACKS */ /* * This returns the high 64 bits of the product of two 64-bit numbers. diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S index a2b18df..e514490 100644 --- a/arch/powerpc/kernel/misc_64.S +++ b/arch/powerpc/kernel/misc_64.S @@ -28,7 +28,6 @@ .text -#ifdef CONFIG_IRQSTACKS _GLOBAL(call_do_softirq) mflr r0 std r0,16(r1) @@ -52,7 +51,6 @@ _GLOBAL(call_handle_irq) ld r0,16(r1) mtlr r0 blr -#endif /* CONFIG_IRQSTACKS */ .section ".toc","aw" PPC64_CACHES: diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 9d255b4..773424d 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1005,7 +1005,6 @@ out: return error; } -#ifdef CONFIG_IRQSTACKS static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, unsigned long nbytes) { @@ -1030,10 +1029,6 @@ static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, return 0; } -#else -#define valid_irq_stack(sp, p, nb) 0 -#endif /* CONFIG_IRQSTACKS */ - int validate_sp(unsigned long sp, struct task_struct *p, unsigned long nbytes) { diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c index 8f58986..7d84b21 100644 --- a/arch/powerpc/kernel/setup_32.c +++ b/arch/powerpc/kernel/setup_32.c @@ -241,7 +241,6 @@ int __init ppc_init(void) arch_initcall(ppc_init); -#ifdef CONFIG_IRQSTACKS static void __init irqstack_early_init(void) { unsigned int i; @@ -255,9 +254,6 @@ static void __init irqstack_early_init(void) __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); } } -#else -#define irqstack_early_init() -#endif #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) static void __init exc_lvl_early_init(void) diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index f3fb5a7..643dcac 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -432,7 +432,6 @@ static u64 slb0_limit(void) return 1UL << SID_SHIFT; } -#ifdef CONFIG_IRQSTACKS static void __init irqstack_early_init(void) { u64 limit = slb0_limit(); @@ -451,9 +450,6 @@ static void __init irqstack_early_init(void) THREAD_SIZE, limit)); } } -#else -#define irqstack_early_init() -#endif #ifdef CONFIG_PPC_BOOK3E static void __init exc_lvl_early_init(void) |