Merge ../linux-2.6 by hand

11 files changed, 80 insertions, 145 deletions

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 3e1b0327e4d7..c11169b5ed9a 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-AFLAGS_head.o := -DTEXTADDR=$(TEXTADDR) -DDATAADDR=$(DATAADDR)
+AFLAGS_head.o := -DKERNEL_RAM_ADDR=$(TEXTADDR)
 
 # Object file lists.
 
diff --git a/arch/arm/kernel/arthur.c b/arch/arm/kernel/arthur.c
index a418dad6692c..0ee2e9819631 100644
--- a/arch/arm/kernel/arthur.c
+++ b/arch/arm/kernel/arthur.c
@@ -18,6 +18,7 @@
 #include <linux/stddef.h>
 #include <linux/signal.h>
 #include <linux/init.h>
+#include <linux/sched.h>
 
 #include <asm/ptrace.h>
 
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index c1ff4d1f1bfd..04d3082a7b94 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -94,7 +94,6 @@ int main(void)
   DEFINE(VM_EXEC,               VM_EXEC);
   BLANK();
   DEFINE(PAGE_SZ,               PAGE_SIZE);
-  DEFINE(VIRT_OFFSET,           PAGE_OFFSET);
   BLANK();
   DEFINE(SYS_ERROR0,            0x9f0000);
   BLANK();
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 93b5e8e5292e..be439cab92c6 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -15,6 +15,7 @@
  */
 #include <linux/config.h>
 
+#include <asm/memory.h>
 #include <asm/glue.h>
 #include <asm/vfpmacros.h>
 #include <asm/hardware.h>               /* should be moved into entry-macro.S */
@@ -310,7 +311,7 @@ __pabt_svc:
 
 #if __LINUX_ARM_ARCH__ < 6 && !defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
         @ make sure our user space atomic helper is aborted
-        cmp     r2, #VIRT_OFFSET
+        cmp     r2, #TASK_SIZE
         bichs   r3, r3, #PSR_Z_BIT
 #endif
 
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 539626351348..8d8748407cbe 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -21,6 +21,7 @@
 #include <asm/procinfo.h>
 #include <asm/ptrace.h>
 #include <asm/asm-offsets.h>
+#include <asm/memory.h>
 #include <asm/thread_info.h>
 #include <asm/system.h>
 
@@ -33,52 +34,28 @@
 #define MACHINFO_PGOFFIO        12
 #define MACHINFO_NAME           16
 
-#ifndef CONFIG_XIP_KERNEL
 /*
- * We place the page tables 16K below TEXTADDR.  Therefore, we must make sure
- * that TEXTADDR is correctly set.  Currently, we expect the least significant
- * 16 bits to be 0x8000, but we could probably relax this restriction to
- * TEXTADDR >= PAGE_OFFSET + 0x4000
- *
- * Note that swapper_pg_dir is the virtual address of the page tables, and
- * pgtbl gives us a position-independent reference to these tables.  We can
- * do this because stext == TEXTADDR
+ * swapper_pg_dir is the virtual address of the initial page table.
+ * We place the page tables 16K below KERNEL_RAM_ADDR.  Therefore, we must
+ * make sure that KERNEL_RAM_ADDR is correctly set.  Currently, we expect
+ * the least significant 16 bits to be 0x8000, but we could probably
+ * relax this restriction to KERNEL_RAM_ADDR >= PAGE_OFFSET + 0x4000.
  */
-#if (TEXTADDR & 0xffff) != 0x8000
-#error TEXTADDR must start at 0xXXXX8000
+#if (KERNEL_RAM_ADDR & 0xffff) != 0x8000
+#error KERNEL_RAM_ADDR must start at 0xXXXX8000
 #endif
 
         .globl  swapper_pg_dir
-        .equ    swapper_pg_dir, TEXTADDR - 0x4000
+        .equ    swapper_pg_dir, KERNEL_RAM_ADDR - 0x4000
 
-        .macro  pgtbl, rd, phys
-        adr     \rd, stext
-        sub     \rd, \rd, #0x4000
+        .macro  pgtbl, rd
+        ldr     \rd, =(__virt_to_phys(KERNEL_RAM_ADDR - 0x4000))
         .endm
-#else
-/*
- * XIP Kernel:
- *
- * We place the page tables 16K below DATAADDR.  Therefore, we must make sure
- * that DATAADDR is correctly set.  Currently, we expect the least significant
- * 16 bits to be 0x8000, but we could probably relax this restriction to
- * DATAADDR >= PAGE_OFFSET + 0x4000
- *
- * Note that pgtbl is meant to return the physical address of swapper_pg_dir.
- * We can't make it relative to the kernel position in this case since
- * the kernel can physically be anywhere.
- */
-#if (DATAADDR & 0xffff) != 0x8000
-#error DATAADDR must start at 0xXXXX8000
-#endif
-
-        .globl  swapper_pg_dir
-        .equ    swapper_pg_dir, DATAADDR - 0x4000
 
-        .macro  pgtbl, rd, phys
-        ldr     \rd, =((DATAADDR - 0x4000) - VIRT_OFFSET)
-        add     \rd, \rd, \phys
-        .endm
+#ifdef CONFIG_XIP_KERNEL
+#define TEXTADDR  XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+#else
+#define TEXTADDR  KERNEL_RAM_ADDR
 #endif
 
 /*
@@ -279,7 +256,7 @@ __turn_mmu_on:
         .type   __create_page_tables, %function
 __create_page_tables:
         ldr     r5, [r8, #MACHINFO_PHYSRAM]     @ physram
-        pgtbl   r4, r5                          @ page table address
+        pgtbl   r4                              @ page table address
 
         /*
          * Clear the 16K level 1 swapper page table
@@ -324,7 +301,7 @@ __create_page_tables:
         /*
          * Then map first 1MB of ram in case it contains our boot params.
          */
-        add     r0, r4, #VIRT_OFFSET >> 18
+        add     r0, r4, #PAGE_OFFSET >> 18
         orr     r6, r5, r7
         str     r6, [r0]
 
diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index 1a85cfdad5ac..6055e1427ba3 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -11,6 +11,7 @@
  */
 #include <linux/config.h>
 #include <linux/module.h>
+#include <linux/moduleloader.h>
 #include <linux/kernel.h>
 #include <linux/elf.h>
 #include <linux/vmalloc.h>
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index cd99b83f14c2..9bd8609a2926 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -782,7 +782,7 @@ static int do_ptrace(int request, struct task_struct *child, long addr, long dat
         return ret;
 }
 
-asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
+asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
 {
         struct task_struct *child;
         int ret;
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index a94d75fef598..a917e3dd3666 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -139,93 +139,33 @@ struct iwmmxt_sigframe {
         unsigned long   storage[0x98/4];
 };
 
-static int page_present(struct mm_struct *mm, void __user *uptr, int wr)
-{
-        unsigned long addr = (unsigned long)uptr;
-        pgd_t *pgd = pgd_offset(mm, addr);
-        if (pgd_present(*pgd)) {
-                pmd_t *pmd = pmd_offset(pgd, addr);
-                if (pmd_present(*pmd)) {
-                        pte_t *pte = pte_offset_map(pmd, addr);
-                        return (pte_present(*pte) && (!wr || pte_write(*pte)));
-                }
-        }
-        return 0;
-}
-
-static int copy_locked(void __user *uptr, void *kptr, size_t size, int write,
-                       void (*copyfn)(void *, void __user *))
-{
-        unsigned char v, __user *userptr = uptr;
-        int err = 0;
-
-        do {
-                struct mm_struct *mm;
-
-                if (write) {
-                        __put_user_error(0, userptr, err);
-                        __put_user_error(0, userptr + size - 1, err);
-                } else {
-                        __get_user_error(v, userptr, err);
-                        __get_user_error(v, userptr + size - 1, err);
-                }
-
-                if (err)
-                        break;
-
-                mm = current->mm;
-                spin_lock(&mm->page_table_lock);
-                if (page_present(mm, userptr, write) &&
-                    page_present(mm, userptr + size - 1, write)) {
-                        copyfn(kptr, uptr);
-                } else
-                        err = 1;
-                spin_unlock(&mm->page_table_lock);
-        } while (err);
-
-        return err;
-}
-
 static int preserve_iwmmxt_context(struct iwmmxt_sigframe *frame)
 {
-        int err = 0;
+        char kbuf[sizeof(*frame) + 8];
+        struct iwmmxt_sigframe *kframe;
 
         /* the iWMMXt context must be 64 bit aligned */
-        WARN_ON((unsigned long)frame & 7);
-
-        __put_user_error(IWMMXT_MAGIC0, &frame->magic0, err);
-        __put_user_error(IWMMXT_MAGIC1, &frame->magic1, err);
-
-        /*
-         * iwmmxt_task_copy() doesn't check user permissions.
-         * Let's do a dummy write on the upper boundary to ensure
-         * access to user mem is OK all way up.
-         */
-        err |= copy_locked(&frame->storage, current_thread_info(),
-                           sizeof(frame->storage), 1, iwmmxt_task_copy);
-        return err;
+        kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7);
+        kframe->magic0 = IWMMXT_MAGIC0;
+        kframe->magic1 = IWMMXT_MAGIC1;
+        iwmmxt_task_copy(current_thread_info(), &kframe->storage);
+        return __copy_to_user(frame, kframe, sizeof(*frame));
 }
 
 static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame)
 {
-        unsigned long magic0, magic1;
-        int err = 0;
+        char kbuf[sizeof(*frame) + 8];
+        struct iwmmxt_sigframe *kframe;
 
-        /* the iWMMXt context is 64 bit aligned */
-        WARN_ON((unsigned long)frame & 7);
-
-        /*
-         * Validate iWMMXt context signature.
-         * Also, iwmmxt_task_restore() doesn't check user permissions.
-         * Let's do a dummy write on the upper boundary to ensure
-         * access to user mem is OK all way up.
-         */
-        __get_user_error(magic0, &frame->magic0, err);
-        __get_user_error(magic1, &frame->magic1, err);
-        if (!err && magic0 == IWMMXT_MAGIC0 && magic1 == IWMMXT_MAGIC1)
-                err = copy_locked(&frame->storage, current_thread_info(),
-                                  sizeof(frame->storage), 0, iwmmxt_task_restore);
-        return err;
+        /* the iWMMXt context must be 64 bit aligned */
+        kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7);
+        if (__copy_from_user(kframe, frame, sizeof(*frame)))
+                return -1;
+        if (kframe->magic0 != IWMMXT_MAGIC0 ||
+            kframe->magic1 != IWMMXT_MAGIC1)
+                return -1;
+        iwmmxt_task_restore(current_thread_info(), &kframe->storage);
+        return 0;
 }
 
 #endif
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 69449a818dcc..fc4729106a32 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -36,10 +36,6 @@
 #include <asm/thread_info.h>
 #include <asm/mach/time.h>
 
-u64 jiffies_64 = INITIAL_JIFFIES;
-
-EXPORT_SYMBOL(jiffies_64);
-
 /*
  * Our system timer.
  */
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index f6de76e0a45d..45e9ea6cd2a5 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -198,25 +198,16 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)
         barrier();
 }
 
-DEFINE_SPINLOCK(die_lock);
-
-/*
- * This function is protected against re-entrancy.
- */
-NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
+static void __die(const char *str, int err, struct thread_info *thread, struct pt_regs *regs)
 {
-        struct task_struct *tsk = current;
+        struct task_struct *tsk = thread->task;
         static int die_counter;
 
-        console_verbose();
-        spin_lock_irq(&die_lock);
-        bust_spinlocks(1);
-
         printk("Internal error: %s: %x [#%d]\n", str, err, ++die_counter);
         print_modules();
         __show_regs(regs);
         printk("Process %s (pid: %d, stack limit = 0x%p)\n",
-                tsk->comm, tsk->pid, tsk->thread_info + 1);
+                tsk->comm, tsk->pid, thread + 1);
 
         if (!user_mode(regs) || in_interrupt()) {
                 dump_mem("Stack: ", regs->ARM_sp,
@@ -224,7 +215,21 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
                 dump_backtrace(regs, tsk);
                 dump_instr(regs);
         }
+}
+
+DEFINE_SPINLOCK(die_lock);
+
+/*
+ * This function is protected against re-entrancy.
+ */
+NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
+{
+        struct thread_info *thread = current_thread_info();
 
+        console_verbose();
+        spin_lock_irq(&die_lock);
+        bust_spinlocks(1);
+        __die(str, err, thread, regs);
         bust_spinlocks(0);
         spin_unlock_irq(&die_lock);
         do_exit(SIGSEGV);
@@ -345,7 +350,9 @@ static int bad_syscall(int n, struct pt_regs *regs)
         struct thread_info *thread = current_thread_info();
         siginfo_t info;
 
-        if (current->personality != PER_LINUX && thread->exec_domain->handler) {
+        if (current->personality != PER_LINUX &&
+            current->personality != PER_LINUX_32BIT &&
+            thread->exec_domain->handler) {
                 thread->exec_domain->handler(n, regs);
                 return regs->ARM_r0;
         }
@@ -481,29 +488,33 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
                 unsigned long addr = regs->ARM_r2;
                 struct mm_struct *mm = current->mm;
                 pgd_t *pgd; pmd_t *pmd; pte_t *pte;
+                spinlock_t *ptl;
 
                 regs->ARM_cpsr &= ~PSR_C_BIT;
-                spin_lock(&mm->page_table_lock);
+                down_read(&mm->mmap_sem);
                 pgd = pgd_offset(mm, addr);
                 if (!pgd_present(*pgd))
                         goto bad_access;
                 pmd = pmd_offset(pgd, addr);
                 if (!pmd_present(*pmd))
                         goto bad_access;
-                pte = pte_offset_map(pmd, addr);
-                if (!pte_present(*pte) || !pte_write(*pte))
+                pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
+                if (!pte_present(*pte) || !pte_write(*pte)) {
+                        pte_unmap_unlock(pte, ptl);
                         goto bad_access;
+                }
                 val = *(unsigned long *)addr;
                 val -= regs->ARM_r0;
                 if (val == 0) {
                         *(unsigned long *)addr = regs->ARM_r1;
                         regs->ARM_cpsr |= PSR_C_BIT;
                 }
-                spin_unlock(&mm->page_table_lock);
+                pte_unmap_unlock(pte, ptl);
+                up_read(&mm->mmap_sem);
                 return val;
 
                 bad_access:
-                spin_unlock(&mm->page_table_lock);
+                up_read(&mm->mmap_sem);
                 /* simulate a write access fault */
                 do_DataAbort(addr, 15 + (1 << 11), regs);
                 return -1;
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 0d5db5279c5c..80c8e4c8cefa 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -6,14 +6,23 @@
 #include <asm-generic/vmlinux.lds.h>
 #include <linux/config.h>
 #include <asm/thread_info.h>
+#include <asm/memory.h>
         
 OUTPUT_ARCH(arm)
 ENTRY(stext)
+
 #ifndef __ARMEB__
 jiffies = jiffies_64;
 #else
 jiffies = jiffies_64 + 4;
 #endif
+
+#ifdef CONFIG_XIP_KERNEL
+#define TEXTADDR  XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+#else
+#define TEXTADDR  KERNEL_RAM_ADDR
+#endif
+
 SECTIONS
 {
         . = TEXTADDR;
@@ -95,7 +104,7 @@ SECTIONS
 
 #ifdef CONFIG_XIP_KERNEL
         __data_loc = ALIGN(4);          /* location in binary */
-        . = DATAADDR;
+        . = KERNEL_RAM_ADDR;
 #else
         . = ALIGN(THREAD_SIZE);
         __data_loc = .;