Merge Linus' tree.

8 files changed, 121 insertions, 75 deletions

diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
index 67932ad53082..57b047c27e46 100644
--- a/arch/ia64/Makefile
+++ b/arch/ia64/Makefile
@@ -37,10 +37,6 @@ $(error Sorry, you need a newer version of the assember, one that is built from
                 ftp://ftp.hpl.hp.com/pub/linux-ia64/gas-030124.tar.gz)
 endif
 
-ifneq ($(shell if [ $(GCC_VERSION) -lt 0300 ] ; then echo "bad"; fi ;),)
-$(error Sorry, your compiler is too old.  GCC v2.96 is known to generate bad code.)
-endif
-
 ifeq ($(GCC_VERSION),0304)
         cflags-$(CONFIG_ITANIUM)        += -mtune=merced
         cflags-$(CONFIG_MCKINLEY)       += -mtune=mckinley
diff --git a/arch/ia64/ia32/sys_ia32.c b/arch/ia64/ia32/sys_ia32.c
index dc282710421a..9f8e8d558873 100644
--- a/arch/ia64/ia32/sys_ia32.c
+++ b/arch/ia64/ia32/sys_ia32.c
@@ -1761,21 +1761,15 @@ sys32_ptrace (int request, pid_t pid, unsigned int addr, unsigned int data)
 
         lock_kernel();
         if (request == PTRACE_TRACEME) {
-                ret = sys_ptrace(request, pid, addr, data);
+                ret = ptrace_traceme();
                 goto out;
         }
 
-        ret = -ESRCH;
-        read_lock(&tasklist_lock);
-        child = find_task_by_pid(pid);
-        if (child)
-                get_task_struct(child);
-        read_unlock(&tasklist_lock);
-        if (!child)
+        child = ptrace_get_task_struct(pid);
+        if (IS_ERR(child)) {
+                ret = PTR_ERR(child);
                 goto out;
-        ret = -EPERM;
-        if (pid == 1)           /* no messing around with init! */
-                goto out_tsk;
+        }
 
         if (request == PTRACE_ATTACH) {
                 ret = sys_ptrace(request, pid, addr, data);
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index a3aa45cbcfa0..c485a3b32ba8 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -247,6 +247,32 @@ typedef struct kern_memdesc {
 
 static kern_memdesc_t *kern_memmap;
 
+#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
+
+static inline u64
+kmd_end(kern_memdesc_t *kmd)
+{
+        return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
+}
+
+static inline u64
+efi_md_end(efi_memory_desc_t *md)
+{
+        return (md->phys_addr + efi_md_size(md));
+}
+
+static inline int
+efi_wb(efi_memory_desc_t *md)
+{
+        return (md->attribute & EFI_MEMORY_WB);
+}
+
+static inline int
+efi_uc(efi_memory_desc_t *md)
+{
+        return (md->attribute & EFI_MEMORY_UC);
+}
+
 static void
 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 {
@@ -595,8 +621,8 @@ efi_get_iobase (void)
         return 0;
 }
 
-u32
-efi_mem_type (unsigned long phys_addr)
+static efi_memory_desc_t *
+efi_memory_descriptor (unsigned long phys_addr)
 {
         void *efi_map_start, *efi_map_end, *p;
         efi_memory_desc_t *md;
@@ -610,13 +636,13 @@ efi_mem_type (unsigned long phys_addr)
                 md = p;
 
                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
-                         return md->type;
+                         return md;
         }
         return 0;
 }
 
-u64
-efi_mem_attributes (unsigned long phys_addr)
+static int
+efi_memmap_has_mmio (void)
 {
         void *efi_map_start, *efi_map_end, *p;
         efi_memory_desc_t *md;
@@ -629,36 +655,98 @@ efi_mem_attributes (unsigned long phys_addr)
         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
                 md = p;
 
-                if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
-                        return md->attribute;
+                if (md->type == EFI_MEMORY_MAPPED_IO)
+                        return 1;
         }
         return 0;
 }
+
+u32
+efi_mem_type (unsigned long phys_addr)
+{
+        efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
+
+        if (md)
+                return md->type;
+        return 0;
+}
+
+u64
+efi_mem_attributes (unsigned long phys_addr)
+{
+        efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
+
+        if (md)
+                return md->attribute;
+        return 0;
+}
 EXPORT_SYMBOL(efi_mem_attributes);
 
+/*
+ * Determines whether the memory at phys_addr supports the desired
+ * attribute (WB, UC, etc).  If this returns 1, the caller can safely
+ * access *size bytes at phys_addr with the specified attribute.
+ */
+static int
+efi_mem_attribute_range (unsigned long phys_addr, unsigned long *size, u64 attr)
+{
+        efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
+        unsigned long md_end;
+
+        if (!md || (md->attribute & attr) != attr)
+                return 0;
+
+        do {
+                md_end = efi_md_end(md);
+                if (phys_addr + *size <= md_end)
+                        return 1;
+
+                md = efi_memory_descriptor(md_end);
+                if (!md || (md->attribute & attr) != attr) {
+                        *size = md_end - phys_addr;
+                        return 1;
+                }
+        } while (md);
+        return 0;
+}
+
+/*
+ * For /dev/mem, we only allow read & write system calls to access
+ * write-back memory, because read & write don't allow the user to
+ * control access size.
+ */
 int
 valid_phys_addr_range (unsigned long phys_addr, unsigned long *size)
 {
-        void *efi_map_start, *efi_map_end, *p;
-        efi_memory_desc_t *md;
-        u64 efi_desc_size;
+        return efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB);
+}
 
-        efi_map_start = __va(ia64_boot_param->efi_memmap);
-        efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
-        efi_desc_size = ia64_boot_param->efi_memdesc_size;
+/*
+ * We allow mmap of anything in the EFI memory map that supports
+ * either write-back or uncacheable access.  For uncacheable regions,
+ * the supported access sizes are system-dependent, and the user is
+ * responsible for using the correct size.
+ *
+ * Note that this doesn't currently allow access to hot-added memory,
+ * because that doesn't appear in the boot-time EFI memory map.
+ */
+int
+valid_mmap_phys_addr_range (unsigned long phys_addr, unsigned long *size)
+{
+        if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB))
+                return 1;
 
-        for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
-                md = p;
+        if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_UC))
+                return 1;
 
-                if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT)) {
-                        if (!(md->attribute & EFI_MEMORY_WB))
-                                return 0;
+        /*
+         * Some firmware doesn't report MMIO regions in the EFI memory map.
+         * The Intel BigSur (a.k.a. HP i2000) has this problem.  In this
+         * case, we can't use the EFI memory map to validate mmap requests.
+         */
+        if (!efi_memmap_has_mmio())
+                return 1;
 
-                        if (*size > md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr)
-                                *size = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr;
-                        return 1;
-                }
-        }
         return 0;
 }
 
@@ -707,32 +795,6 @@ efi_uart_console_only(void)
         return 0;
 }
 
-#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
-
-static inline u64
-kmd_end(kern_memdesc_t *kmd)
-{
-        return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
-}
-
-static inline u64
-efi_md_end(efi_memory_desc_t *md)
-{
-        return (md->phys_addr + efi_md_size(md));
-}
-
-static inline int
-efi_wb(efi_memory_desc_t *md)
-{
-        return (md->attribute & EFI_MEMORY_WB);
-}
-
-static inline int
-efi_uc(efi_memory_desc_t *md)
-{
-        return (md->attribute & EFI_MEMORY_UC);
-}
-
 /*
  * Look for the first granule aligned memory descriptor memory
  * that is big enough to hold EFI memory map. Make sure this
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index 0741b066b98f..7a6ffd613789 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -1600,5 +1600,6 @@ sys_call_table:
         data8 sys_inotify_init
         data8 sys_inotify_add_watch
         data8 sys_inotify_rm_watch
+        data8 sys_migrate_pages                 // 1280
 
         .org sys_call_table + 8*NR_syscalls     // guard against failures to increase NR_syscalls
diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
index bfe65b2e8621..fbc7ea35dd57 100644
--- a/arch/ia64/kernel/head.S
+++ b/arch/ia64/kernel/head.S
@@ -1060,7 +1060,7 @@ SET_REG(b5);
          * the clobber lists for spin_lock() in include/asm-ia64/spinlock.h.
          */
 
-#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
+#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
 
 GLOBAL_ENTRY(ia64_spinlock_contention_pre3_4)
         .prologue
diff --git a/arch/ia64/kernel/ia64_ksyms.c b/arch/ia64/kernel/ia64_ksyms.c
index 5db9d3bcbbcb..e72de580ebbf 100644
--- a/arch/ia64/kernel/ia64_ksyms.c
+++ b/arch/ia64/kernel/ia64_ksyms.c
@@ -103,7 +103,7 @@ EXPORT_SYMBOL(unw_init_running);
 
 #ifdef ASM_SUPPORTED
 # ifdef CONFIG_SMP
-#  if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
+#  if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
 /*
  * This is not a normal routine and we don't want a function descriptor for it, so we use
  * a fake declaration here.
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 4b19d0410632..8d88eeea02d1 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -1422,14 +1422,7 @@ sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
         lock_kernel();
         ret = -EPERM;
         if (request == PTRACE_TRACEME) {
-                /* are we already being traced? */
-                if (current->ptrace & PT_PTRACED)
-                        goto out;
-                ret = security_ptrace(current->parent, current);
-                if (ret)
-                        goto out;
-                current->ptrace |= PT_PTRACED;
-                ret = 0;
+                ret = ptrace_traceme();
                 goto out;
         }
 
diff --git a/arch/ia64/oprofile/backtrace.c b/arch/ia64/oprofile/backtrace.c
index b7dabbfb0d61..adb01566bd57 100644
--- a/arch/ia64/oprofile/backtrace.c
+++ b/arch/ia64/oprofile/backtrace.c
@@ -32,7 +32,7 @@ typedef struct
         u64 *prev_pfs_loc;      /* state for WAR for old spinlock ool code */
 } ia64_backtrace_t;
 
-#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
+#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
 /*
  * Returns non-zero if the PC is in the spinlock contention out-of-line code
  * with non-standard calling sequence (on older compilers).