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

Conflicts:
	litmus/sched_cedf.c

10 files changed, 117 insertions, 94 deletions

diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile
index 1119233597a1..c4491c15afb2 100644
--- a/arch/um/kernel/Makefile
+++ b/arch/um/kernel/Makefile
@@ -17,6 +17,7 @@ obj-y = config.o exec.o exitcode.o init_task.o irq.o ksyms.o mem.o \
 obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
 obj-$(CONFIG_GPROF)     += gprof_syms.o
 obj-$(CONFIG_GCOV)      += gmon_syms.o
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
 
 USER_OBJS := config.o
 
diff --git a/arch/um/kernel/dyn.lds.S b/arch/um/kernel/dyn.lds.S
index 69268014dd8e..a3cab6d3ae02 100644
--- a/arch/um/kernel/dyn.lds.S
+++ b/arch/um/kernel/dyn.lds.S
@@ -50,8 +50,18 @@ SECTIONS
   .rela.got       : { *(.rela.got) }
   .rel.bss        : { *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*) }
   .rela.bss       : { *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*) }
-  .rel.plt        : { *(.rel.plt) }
-  .rela.plt       : { *(.rela.plt) }
+  .rel.plt : {
+        *(.rel.plt)
+        PROVIDE_HIDDEN(__rel_iplt_start = .);
+        *(.rel.iplt)
+        PROVIDE_HIDDEN(__rel_iplt_end = .);
+  }
+  .rela.plt : {
+        *(.rela.plt)
+        PROVIDE_HIDDEN(__rela_iplt_start = .);
+        *(.rela.iplt)
+        PROVIDE_HIDDEN(__rela_iplt_end = .);
+  }
   .init           : {
     KEEP (*(.init))
   } =0x90909090
diff --git a/arch/um/kernel/early_printk.c b/arch/um/kernel/early_printk.c
new file mode 100644
index 000000000000..ec649bf72f68
--- /dev/null
+++ b/arch/um/kernel/early_printk.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include "os.h"
+
+static void early_console_write(struct console *con, const char *s, unsigned int n)
+{
+        um_early_printk(s, n);
+}
+
+static struct console early_console = {
+        .name = "earlycon",
+        .write = early_console_write,
+        .flags = CON_BOOT,
+        .index = -1,
+};
+
+static int __init setup_early_printk(char *buf)
+{
+        register_console(&early_console);
+
+        return 0;
+}
+
+early_param("earlyprintk", setup_early_printk);
diff --git a/arch/um/kernel/exec.c b/arch/um/kernel/exec.c
index 49b5e1eb3262..09bd7b585726 100644
--- a/arch/um/kernel/exec.c
+++ b/arch/um/kernel/exec.c
@@ -5,7 +5,6 @@
 
 #include "linux/stddef.h"
 #include "linux/fs.h"
-#include "linux/smp_lock.h"
 #include "linux/ptrace.h"
 #include "linux/sched.h"
 #include "linux/slab.h"
@@ -78,13 +77,11 @@ long sys_execve(const char __user *file, const char __user *const __user *argv,
         long error;
         char *filename;
 
-        lock_kernel();
         filename = getname(file);
         error = PTR_ERR(filename);
         if (IS_ERR(filename)) goto out;
         error = execve1(filename, argv, env);
         putname(filename);
  out:
-        unlock_kernel();
         return error;
 }
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index a3f0b04d7101..9e485c770308 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -18,50 +18,6 @@
 #include "os.h"
 
 /*
- * Generic, controller-independent functions:
- */
-
-int show_interrupts(struct seq_file *p, void *v)
-{
-        int i = *(loff_t *) v, j;
-        struct irqaction * action;
-        unsigned long flags;
-
-        if (i == 0) {
-                seq_printf(p, "           ");
-                for_each_online_cpu(j)
-                        seq_printf(p, "CPU%d       ",j);
-                seq_putc(p, '\n');
-        }
-
-        if (i < NR_IRQS) {
-                raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
-                action = irq_desc[i].action;
-                if (!action)
-                        goto skip;
-                seq_printf(p, "%3d: ",i);
-#ifndef CONFIG_SMP
-                seq_printf(p, "%10u ", kstat_irqs(i));
-#else
-                for_each_online_cpu(j)
-                        seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
-#endif
-                seq_printf(p, " %14s", irq_desc[i].chip->typename);
-                seq_printf(p, "  %s", action->name);
-
-                for (action=action->next; action; action = action->next)
-                        seq_printf(p, ", %s", action->name);
-
-                seq_putc(p, '\n');
-skip:
-                raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
-        } else if (i == NR_IRQS)
-                seq_putc(p, '\n');
-
-        return 0;
-}
-
-/*
  * This list is accessed under irq_lock, except in sigio_handler,
  * where it is safe from being modified.  IRQ handlers won't change it -
  * if an IRQ source has vanished, it will be freed by free_irqs just
@@ -334,7 +290,7 @@ unsigned int do_IRQ(int irq, struct uml_pt_regs *regs)
 {
         struct pt_regs *old_regs = set_irq_regs((struct pt_regs *)regs);
         irq_enter();
-        __do_IRQ(irq);
+        generic_handle_irq(irq);
         irq_exit();
         set_irq_regs(old_regs);
         return 1;
@@ -360,49 +316,38 @@ EXPORT_SYMBOL(um_request_irq);
 EXPORT_SYMBOL(reactivate_fd);
 
 /*
- * irq_chip must define (startup || enable) &&
- * (shutdown || disable) && end
+ * irq_chip must define at least enable/disable and ack when
+ * the edge handler is used.
  */
-static void dummy(unsigned int irq)
+static void dummy(struct irq_data *d)
 {
 }
 
 /* This is used for everything else than the timer. */
 static struct irq_chip normal_irq_type = {
-        .typename = "SIGIO",
+        .name = "SIGIO",
         .release = free_irq_by_irq_and_dev,
-        .disable = dummy,
-        .enable = dummy,
-        .ack = dummy,
-        .end = dummy
+        .irq_disable = dummy,
+        .irq_enable = dummy,
+        .irq_ack = dummy,
 };
 
 static struct irq_chip SIGVTALRM_irq_type = {
-        .typename = "SIGVTALRM",
+        .name = "SIGVTALRM",
         .release = free_irq_by_irq_and_dev,
-        .shutdown = dummy, /* never called */
-        .disable = dummy,
-        .enable = dummy,
-        .ack = dummy,
-        .end = dummy
+        .irq_disable = dummy,
+        .irq_enable = dummy,
+        .irq_ack = dummy,
 };
 
 void __init init_IRQ(void)
 {
         int i;
 
-        irq_desc[TIMER_IRQ].status = IRQ_DISABLED;
-        irq_desc[TIMER_IRQ].action = NULL;
-        irq_desc[TIMER_IRQ].depth = 1;
-        irq_desc[TIMER_IRQ].chip = &SIGVTALRM_irq_type;
-        enable_irq(TIMER_IRQ);
-        for (i = 1; i < NR_IRQS; i++) {
-                irq_desc[i].status = IRQ_DISABLED;
-                irq_desc[i].action = NULL;
-                irq_desc[i].depth = 1;
-                irq_desc[i].chip = &normal_irq_type;
-                enable_irq(i);
-        }
+        irq_set_chip_and_handler(TIMER_IRQ, &SIGVTALRM_irq_type, handle_edge_irq);
+
+        for (i = 1; i < NR_IRQS; i++)
+                irq_set_chip_and_handler(i, &normal_irq_type, handle_edge_irq);
 }
 
 /*
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index e0510496596c..701b672c1122 100644
--- a/arch/um/kernel/ptrace.c
+++ b/arch/um/kernel/ptrace.c
@@ -42,10 +42,12 @@ void ptrace_disable(struct task_struct *child)
 extern int peek_user(struct task_struct * child, long addr, long data);
 extern int poke_user(struct task_struct * child, long addr, long data);
 
-long arch_ptrace(struct task_struct *child, long request, long addr, long data)
+long arch_ptrace(struct task_struct *child, long request,
+                 unsigned long addr, unsigned long data)
 {
         int i, ret;
-        unsigned long __user *p = (void __user *)(unsigned long)data;
+        unsigned long __user *p = (void __user *)data;
+        void __user *vp = p;
 
         switch (request) {
         /* read word at location addr. */
@@ -107,24 +109,20 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 #endif
 #ifdef PTRACE_GETFPREGS
         case PTRACE_GETFPREGS: /* Get the child FPU state. */
-                ret = get_fpregs((struct user_i387_struct __user *) data,
-                                 child);
+                ret = get_fpregs(vp, child);
                 break;
 #endif
 #ifdef PTRACE_SETFPREGS
         case PTRACE_SETFPREGS: /* Set the child FPU state. */
-                ret = set_fpregs((struct user_i387_struct __user *) data,
-                                 child);
+                ret = set_fpregs(vp, child);
                 break;
 #endif
         case PTRACE_GET_THREAD_AREA:
-                ret = ptrace_get_thread_area(child, addr,
-                                             (struct user_desc __user *) data);
+                ret = ptrace_get_thread_area(child, addr, vp);
                 break;
 
         case PTRACE_SET_THREAD_AREA:
-                ret = ptrace_set_thread_area(child, addr,
-                                             (struct user_desc __user *) data);
+                ret = ptrace_set_thread_area(child, addr, vp);
                 break;
 
         case PTRACE_FAULTINFO: {
@@ -134,7 +132,8 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                  * On i386, ptrace_faultinfo is smaller!
                  */
                 ret = copy_to_user(p, &child->thread.arch.faultinfo,
-                                   sizeof(struct ptrace_faultinfo));
+                                   sizeof(struct ptrace_faultinfo)) ?
+                        -EIO : 0;
                 break;
         }
 
@@ -158,7 +157,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 #ifdef PTRACE_ARCH_PRCTL
         case PTRACE_ARCH_PRCTL:
                 /* XXX Calls ptrace on the host - needs some SMP thinking */
-                ret = arch_prctl(child, data, (void *) addr);
+                ret = arch_prctl(child, data, (void __user *) addr);
                 break;
 #endif
         default:
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
index 3d099f974785..1aee587e9c5d 100644
--- a/arch/um/kernel/skas/mmu.c
+++ b/arch/um/kernel/skas/mmu.c
@@ -31,7 +31,7 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
         if (!pmd)
                 goto out_pmd;
 
-        pte = pte_alloc_map(mm, pmd, proc);
+        pte = pte_alloc_map(mm, NULL, pmd, proc);
         if (!pte)
                 goto out_pte;
 
diff --git a/arch/um/kernel/smp.c b/arch/um/kernel/smp.c
index 106bf27e2a9a..155206a66908 100644
--- a/arch/um/kernel/smp.c
+++ b/arch/um/kernel/smp.c
@@ -7,9 +7,6 @@
 #include "asm/pgalloc.h"
 #include "asm/tlb.h"
 
-/* For some reason, mmu_gathers are referenced when CONFIG_SMP is off. */
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-
 #ifdef CONFIG_SMP
 
 #include "linux/sched.h"
@@ -173,7 +170,7 @@ void IPI_handler(int cpu)
                         break;
 
                 case 'R':
-                        set_tsk_need_resched(current);
+                        scheduler_ipi();
                         break;
 
                 case 'S':
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index 637c6505dc00..8c7b8823d1f0 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -113,6 +113,27 @@ out_of_memory:
         return 0;
 }
 
+static void show_segv_info(struct uml_pt_regs *regs)
+{
+        struct task_struct *tsk = current;
+        struct faultinfo *fi = UPT_FAULTINFO(regs);
+
+        if (!unhandled_signal(tsk, SIGSEGV))
+                return;
+
+        if (!printk_ratelimit())
+                return;
+
+        printk("%s%s[%d]: segfault at %lx ip %p sp %p error %x",
+                task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
+                tsk->comm, task_pid_nr(tsk), FAULT_ADDRESS(*fi),
+                (void *)UPT_IP(regs), (void *)UPT_SP(regs),
+                fi->error_code);
+
+        print_vma_addr(KERN_CONT " in ", UPT_IP(regs));
+        printk(KERN_CONT "\n");
+}
+
 static void bad_segv(struct faultinfo fi, unsigned long ip)
 {
         struct siginfo si;
@@ -141,6 +162,7 @@ void segv_handler(int sig, struct uml_pt_regs *regs)
         struct faultinfo * fi = UPT_FAULTINFO(regs);
 
         if (UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)) {
+                show_segv_info(regs);
                 bad_segv(*fi, UPT_IP(regs));
                 return;
         }
@@ -202,6 +224,8 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
                       address, ip);
         }
 
+        show_segv_info(regs);
+
         if (err == -EACCES) {
                 si.si_signo = SIGBUS;
                 si.si_errno = 0;
diff --git a/arch/um/kernel/uml.lds.S b/arch/um/kernel/uml.lds.S
index ec6378550671..fbd99402d4d2 100644
--- a/arch/um/kernel/uml.lds.S
+++ b/arch/um/kernel/uml.lds.S
@@ -22,7 +22,7 @@ SECTIONS
   _text = .;
   _stext = .;
   __init_begin = .;
-  INIT_TEXT_SECTION(PAGE_SIZE)
+  INIT_TEXT_SECTION(0)
   . = ALIGN(PAGE_SIZE);
 
   .text      :
@@ -43,6 +43,23 @@ SECTIONS
         __syscall_stub_end = .;
   }
 
+  /*
+   * These are needed even in a static link, even if they wind up being empty.
+   * Newer glibc needs these __rel{,a}_iplt_{start,end} symbols.
+   */
+  .rel.plt : {
+        *(.rel.plt)
+        PROVIDE_HIDDEN(__rel_iplt_start = .);
+        *(.rel.iplt)
+        PROVIDE_HIDDEN(__rel_iplt_end = .);
+  }
+  .rela.plt : {
+        *(.rela.plt)
+        PROVIDE_HIDDEN(__rela_iplt_start = .);
+        *(.rela.iplt)
+        PROVIDE_HIDDEN(__rela_iplt_end = .);
+  }
+
   #include "asm/common.lds.S"
 
   init.data : { INIT_DATA }