Merge branch 'mpi-master' into wip-k-fmlpwip-k-fmlp

Conflicts:
	litmus/sched_cedf.c

1 files changed, 13 insertions, 25 deletions

diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 10709f29d166..72090705a656 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -17,6 +17,7 @@
 #include <linux/delay.h>
 #include <linux/uaccess.h>
 #include <linux/percpu.h>
+#include <linux/mm.h>
 
 #include <asm/apic.h>
 
@@ -49,21 +50,17 @@ 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)
  */
 union irq_ctx {
         struct thread_info      tinfo;
         u32                     stack[THREAD_SIZE/sizeof(u32)];
-} __attribute__((aligned(PAGE_SIZE)));
+} __attribute__((aligned(THREAD_SIZE)));
 
 static DEFINE_PER_CPU(union irq_ctx *, hardirq_ctx);
 static DEFINE_PER_CPU(union irq_ctx *, softirq_ctx);
 
-static DEFINE_PER_CPU_PAGE_ALIGNED(union irq_ctx, hardirq_stack);
-static DEFINE_PER_CPU_PAGE_ALIGNED(union irq_ctx, softirq_stack);
-
 static void call_on_stack(void *func, void *stack)
 {
         asm volatile("xchgl     %%ebx,%%esp     \n"
@@ -82,7 +79,7 @@ execute_on_irq_stack(int overflow, struct irq_desc *desc, int irq)
         u32 *isp, arg1, arg2;
 
         curctx = (union irq_ctx *) current_thread_info();
-        irqctx = __get_cpu_var(hardirq_ctx);
+        irqctx = __this_cpu_read(hardirq_ctx);
 
         /*
          * this is where we switch to the IRQ stack. However, if we are
@@ -129,20 +126,21 @@ void __cpuinit irq_ctx_init(int cpu)
         if (per_cpu(hardirq_ctx, cpu))
                 return;
 
-        irqctx = &per_cpu(hardirq_stack, cpu);
-        irqctx->tinfo.task              = NULL;
-        irqctx->tinfo.exec_domain       = NULL;
+        irqctx = page_address(alloc_pages_node(cpu_to_node(cpu),
+                                               THREAD_FLAGS,
+                                               THREAD_ORDER));
+        memset(&irqctx->tinfo, 0, sizeof(struct thread_info));
         irqctx->tinfo.cpu               = cpu;
         irqctx->tinfo.preempt_count     = HARDIRQ_OFFSET;
         irqctx->tinfo.addr_limit        = MAKE_MM_SEG(0);
 
         per_cpu(hardirq_ctx, cpu) = irqctx;
 
-        irqctx = &per_cpu(softirq_stack, cpu);
-        irqctx->tinfo.task              = NULL;
-        irqctx->tinfo.exec_domain       = NULL;
+        irqctx = page_address(alloc_pages_node(cpu_to_node(cpu),
+                                               THREAD_FLAGS,
+                                               THREAD_ORDER));
+        memset(&irqctx->tinfo, 0, sizeof(struct thread_info));
         irqctx->tinfo.cpu               = cpu;
-        irqctx->tinfo.preempt_count     = 0;
         irqctx->tinfo.addr_limit        = MAKE_MM_SEG(0);
 
         per_cpu(softirq_ctx, cpu) = irqctx;
@@ -151,11 +149,6 @@ void __cpuinit irq_ctx_init(int cpu)
                cpu, per_cpu(hardirq_ctx, cpu),  per_cpu(softirq_ctx, cpu));
 }
 
-void irq_ctx_exit(int cpu)
-{
-        per_cpu(hardirq_ctx, cpu) = NULL;
-}
-
 asmlinkage void do_softirq(void)
 {
         unsigned long flags;
@@ -170,7 +163,7 @@ asmlinkage void do_softirq(void)
 
         if (local_softirq_pending()) {
                 curctx = current_thread_info();
-                irqctx = __get_cpu_var(softirq_ctx);
+                irqctx = __this_cpu_read(softirq_ctx);
                 irqctx->tinfo.task = curctx->task;
                 irqctx->tinfo.previous_esp = current_stack_pointer;
 
@@ -179,7 +172,7 @@ asmlinkage void do_softirq(void)
 
                 call_on_stack(__do_softirq, isp);
                 /*
-                 * Shouldnt happen, we returned above if in_interrupt():
+                 * Shouldn't happen, we returned above if in_interrupt():
                  */
                 WARN_ON_ONCE(softirq_count());
         }
@@ -187,11 +180,6 @@ 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;