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Date: Thu, 6 Apr 2017 19:22:09 +0530 From: Amit Pundir <amit.pundir@...aro.org> To: gregkh@...uxfoundation.org Cc: stable@...r.kernel.org, james.hogan@...tec.com, Matt Redfearn <matt.redfearn@...tec.com>, Thomas Gleixner <tglx@...utronix.de>, Paolo Bonzini <pbonzini@...hat.com>, Chris Metcalf <cmetcalf@...lanox.com>, Petr Mladek <pmladek@...e.com>, Paul Burton <paul.burton@...tec.com>, Aaron Tomlin <atomlin@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org> Subject: [PATCH for-4.10 1/6] MIPS: Introduce irq_stack From: Matt Redfearn <matt.redfearn@...tec.com> Allocate a per-cpu irq stack for use within interrupt handlers. Also add a utility function on_irq_stack to determine if a given stack pointer is within the irq stack for that cpu. Signed-off-by: Matt Redfearn <matt.redfearn@...tec.com> Acked-by: Jason A. Donenfeld <jason@...c4.com> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Paolo Bonzini <pbonzini@...hat.com> Cc: Chris Metcalf <cmetcalf@...lanox.com> Cc: Petr Mladek <pmladek@...e.com> Cc: James Hogan <james.hogan@...tec.com> Cc: Paul Burton <paul.burton@...tec.com> Cc: Aaron Tomlin <atomlin@...hat.com> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org Cc: linux-mips@...ux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14740/ Signed-off-by: Ralf Baechle <ralf@...ux-mips.org> (cherry picked from commit fe8bd18ffea5327344d4ec2bf11f47951212abd0) Signed-off-by: Amit Pundir <amit.pundir@...aro.org> --- arch/mips/include/asm/irq.h | 12 ++++++++++++ arch/mips/kernel/asm-offsets.c | 1 + arch/mips/kernel/irq.c | 11 +++++++++++ 3 files changed, 24 insertions(+) diff --git a/arch/mips/include/asm/irq.h b/arch/mips/include/asm/irq.h index 6bf10e7..956db6e 100644 --- a/arch/mips/include/asm/irq.h +++ b/arch/mips/include/asm/irq.h @@ -17,6 +17,18 @@ #include <irq.h> +#define IRQ_STACK_SIZE THREAD_SIZE + +extern void *irq_stack[NR_CPUS]; + +static inline bool on_irq_stack(int cpu, unsigned long sp) +{ + unsigned long low = (unsigned long)irq_stack[cpu]; + unsigned long high = low + IRQ_STACK_SIZE; + + return (low <= sp && sp <= high); +} + #ifdef CONFIG_I8259 static inline int irq_canonicalize(int irq) { diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c index 6080582..a727769 100644 --- a/arch/mips/kernel/asm-offsets.c +++ b/arch/mips/kernel/asm-offsets.c @@ -102,6 +102,7 @@ void output_thread_info_defines(void) OFFSET(TI_REGS, thread_info, regs); DEFINE(_THREAD_SIZE, THREAD_SIZE); DEFINE(_THREAD_MASK, THREAD_MASK); + DEFINE(_IRQ_STACK_SIZE, IRQ_STACK_SIZE); BLANK(); } diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c index f8f5836..ba150c7 100644 --- a/arch/mips/kernel/irq.c +++ b/arch/mips/kernel/irq.c @@ -25,6 +25,8 @@ #include <linux/atomic.h> #include <linux/uaccess.h> +void *irq_stack[NR_CPUS]; + /* * 'what should we do if we get a hw irq event on an illegal vector'. * each architecture has to answer this themselves. @@ -58,6 +60,15 @@ void __init init_IRQ(void) clear_c0_status(ST0_IM); arch_init_irq(); + + for_each_possible_cpu(i) { + int irq_pages = IRQ_STACK_SIZE / PAGE_SIZE; + void *s = (void *)__get_free_pages(GFP_KERNEL, irq_pages); + + irq_stack[i] = s; + pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i, + irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE); + } } #ifdef CONFIG_DEBUG_STACKOVERFLOW -- 2.7.4
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