Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6

* 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6:
  [PATCH] Use early clobber in semaphores
  [PATCH] Define vsyscall cache as blob to make clearer that user space shouldn't use it
  [PATCH] Re-positioning the bss segment
  [PATCH] Use ARRAY_SIZE in setup.c
  [PATCH] i386: replace intermediate array-size definitions with ARRAY_SIZE()
  [PATCH] x86: Clean up x86 NMI sysctls
  [PATCH] Refactor some duplicated code in mpparse.c
  [PATCH] Document iommu=panic
  [PATCH] Fix broken indentation in iommu_setup
  [PATCH] Allow disabling DAC using command line options
  [PATCH] Add proper sparse __user casts to __copy_to_user_inatomic
  [PATCH] i386: Update defconfig
  [PATCH] Update defconfig

11 files changed, 111 insertions, 86 deletions

diff --git a/arch/i386/defconfig b/arch/i386/defconfig
index 1a29bfa26d0c..ee2d79bd8af7 100644
--- a/arch/i386/defconfig
+++ b/arch/i386/defconfig
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
-# Linux kernel version: 2.6.18-git5
-# Tue Sep 26 09:30:47 2006
+# Linux kernel version: 2.6.18-git7
+# Wed Sep 27 21:53:10 2006
 #
 CONFIG_X86_32=y
 CONFIG_GENERIC_TIME=y
@@ -210,6 +210,7 @@ CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
 CONFIG_PM=y
 CONFIG_PM_LEGACY=y
 # CONFIG_PM_DEBUG is not set
+CONFIG_PM_SYSFS_DEPRECATED=y
 
 #
 # ACPI (Advanced Configuration and Power Interface) Support
@@ -292,6 +293,7 @@ CONFIG_PCI_DIRECT=y
 CONFIG_PCI_MMCONFIG=y
 # CONFIG_PCIEPORTBUS is not set
 CONFIG_PCI_MSI=y
+# CONFIG_PCI_MULTITHREAD_PROBE is not set
 # CONFIG_PCI_DEBUG is not set
 CONFIG_ISA_DMA_API=y
 # CONFIG_ISA is not set
@@ -1427,6 +1429,7 @@ CONFIG_KPROBES=y
 #
 CONFIG_TRACE_IRQFLAGS_SUPPORT=y
 # CONFIG_PRINTK_TIME is not set
+# CONFIG_ENABLE_MUST_CHECK is not set
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_UNUSED_SYMBOLS=y
 CONFIG_DEBUG_KERNEL=y
diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c
index dbda706fdd14..0fc4997fb143 100644
--- a/arch/i386/kernel/nmi.c
+++ b/arch/i386/kernel/nmi.c
@@ -31,6 +31,9 @@
 
 #include "mach_traps.h"
 
+int unknown_nmi_panic;
+int nmi_watchdog_enabled;
+
 /* perfctr_nmi_owner tracks the ownership of the perfctr registers:
  * evtsel_nmi_owner tracks the ownership of the event selection
  * - different performance counters/ event selection may be reserved for
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 814cdebf7377..000cf03751fe 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -209,9 +209,6 @@ static struct resource adapter_rom_resources[] = { {
         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 } };
 
-#define ADAPTER_ROM_RESOURCES \
-        (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0])
-
 static struct resource video_rom_resource = {
         .name   = "Video ROM",
         .start  = 0xc0000,
@@ -273,9 +270,6 @@ static struct resource standard_io_resources[] = { {
         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 } };
 
-#define STANDARD_IO_RESOURCES \
-        (sizeof standard_io_resources / sizeof standard_io_resources[0])
-
 #define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
 
 static int __init romchecksum(unsigned char *rom, unsigned long length)
@@ -332,7 +326,7 @@ static void __init probe_roms(void)
         }
 
         /* check for adapter roms on 2k boundaries */
-        for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) {
+        for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += 2048) {
                 rom = isa_bus_to_virt(start);
                 if (!romsignature(rom))
                         continue;
@@ -1272,7 +1266,7 @@ static int __init request_standard_resources(void)
         request_resource(&iomem_resource, &video_ram_resource);
 
         /* request I/O space for devices used on all i[345]86 PCs */
-        for (i = 0; i < STANDARD_IO_RESOURCES; i++)
+        for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
                 request_resource(&ioport_resource, &standard_io_resources[i]);
         return 0;
 }
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index a13037fe0ee3..6820b8d643c7 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -57,6 +57,8 @@
 
 #include "mach_traps.h"
 
+int panic_on_unrecovered_nmi;
+
 asmlinkage int system_call(void);
 
 struct desc_struct default_ldt[] = { { 0, 0 }, { 0, 0 }, { 0, 0 },
diff --git a/arch/x86_64/defconfig b/arch/x86_64/defconfig
index 647610ecb580..4844b543bed0 100644
--- a/arch/x86_64/defconfig
+++ b/arch/x86_64/defconfig
@@ -1,11 +1,12 @@
 #
 # Automatically generated make config: don't edit
-# Linux kernel version: 2.6.18-git5
-# Tue Sep 26 09:30:47 2006
+# Linux kernel version: 2.6.18-git7
+# Wed Sep 27 21:53:10 2006
 #
 CONFIG_X86_64=y
 CONFIG_64BIT=y
 CONFIG_X86=y
+CONFIG_ZONE_DMA32=y
 CONFIG_LOCKDEP_SUPPORT=y
 CONFIG_STACKTRACE_SUPPORT=y
 CONFIG_SEMAPHORE_SLEEPERS=y
@@ -179,6 +180,7 @@ CONFIG_GENERIC_PENDING_IRQ=y
 CONFIG_PM=y
 # CONFIG_PM_LEGACY is not set
 # CONFIG_PM_DEBUG is not set
+# CONFIG_PM_SYSFS_DEPRECATED is not set
 CONFIG_SOFTWARE_SUSPEND=y
 CONFIG_PM_STD_PARTITION=""
 CONFIG_SUSPEND_SMP=y
@@ -251,6 +253,7 @@ CONFIG_PCI_DIRECT=y
 CONFIG_PCI_MMCONFIG=y
 CONFIG_PCIEPORTBUS=y
 CONFIG_PCI_MSI=y
+# CONFIG_PCI_MULTITHREAD_PROBE is not set
 # CONFIG_PCI_DEBUG is not set
 
 #
@@ -1458,6 +1461,7 @@ CONFIG_KPROBES=y
 #
 CONFIG_TRACE_IRQFLAGS_SUPPORT=y
 # CONFIG_PRINTK_TIME is not set
+# CONFIG_ENABLE_MUST_CHECK is not set
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_UNUSED_SYMBOLS=y
 CONFIG_DEBUG_KERNEL=y
diff --git a/arch/x86_64/kernel/mpparse.c b/arch/x86_64/kernel/mpparse.c
index 20e88f4b564b..b8d53dfa9931 100644
--- a/arch/x86_64/kernel/mpparse.c
+++ b/arch/x86_64/kernel/mpparse.c
@@ -152,6 +152,21 @@ static void __init MP_bus_info (struct mpc_config_bus *m)
         }
 }
 
+static int bad_ioapic(unsigned long address)
+{
+        if (nr_ioapics >= MAX_IO_APICS) {
+                printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
+                        "(found %d)\n", MAX_IO_APICS, nr_ioapics);
+                panic("Recompile kernel with bigger MAX_IO_APICS!\n");
+        }
+        if (!address) {
+                printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
+                        " found in table, skipping!\n");
+                return 1;
+        }
+        return 0;
+}
+
 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
 {
         if (!(m->mpc_flags & MPC_APIC_USABLE))
@@ -159,16 +174,10 @@ static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
 
         printk("I/O APIC #%d at 0x%X.\n",
                 m->mpc_apicid, m->mpc_apicaddr);
-        if (nr_ioapics >= MAX_IO_APICS) {
-                printk(KERN_ERR "Max # of I/O APICs (%d) exceeded (found %d).\n",
-                        MAX_IO_APICS, nr_ioapics);
-                panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
-        }
-        if (!m->mpc_apicaddr) {
-                printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
-                        " found in MP table, skipping!\n");
+
+        if (bad_ioapic(m->mpc_apicaddr))
                 return;
-        }
+
         mp_ioapics[nr_ioapics] = *m;
         nr_ioapics++;
 }
@@ -647,16 +656,8 @@ void __init mp_register_ioapic(u8 id, u32 address, u32 gsi_base)
 {
         int idx = 0;
 
-        if (nr_ioapics >= MAX_IO_APICS) {
-                printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
-                        "(found %d)\n", MAX_IO_APICS, nr_ioapics);
-                panic("Recompile kernel with bigger MAX_IO_APICS!\n");
-        }
-        if (!address) {
-                printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
-                        " found in MADT table, skipping!\n");
+        if (bad_ioapic(address))
                 return;
-        }
 
         idx = nr_ioapics++;
 
diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c
index 4d6fb047952e..7af9cb3e2d99 100644
--- a/arch/x86_64/kernel/nmi.c
+++ b/arch/x86_64/kernel/nmi.c
@@ -28,6 +28,10 @@
 #include <asm/mce.h>
 #include <asm/intel_arch_perfmon.h>
 
+int unknown_nmi_panic;
+int nmi_watchdog_enabled;
+int panic_on_unrecovered_nmi;
+
 /* perfctr_nmi_owner tracks the ownership of the perfctr registers:
  * evtsel_nmi_owner tracks the ownership of the event selection
  * - different performance counters/ event selection may be reserved for
diff --git a/arch/x86_64/kernel/pci-dma.c b/arch/x86_64/kernel/pci-dma.c
index 4dcb671bd19f..f8d857453f8a 100644
--- a/arch/x86_64/kernel/pci-dma.c
+++ b/arch/x86_64/kernel/pci-dma.c
@@ -170,8 +170,20 @@ void dma_free_coherent(struct device *dev, size_t size,
 }
 EXPORT_SYMBOL(dma_free_coherent);
 
+static int forbid_dac __read_mostly;
+
 int dma_supported(struct device *dev, u64 mask)
 {
+#ifdef CONFIG_PCI
+        if (mask > 0xffffffff && forbid_dac > 0) {
+
+
+
+                printk(KERN_INFO "PCI: Disallowing DAC for device %s\n", dev->bus_id);
+                return 0;
+        }
+#endif
+
         if (dma_ops->dma_supported)
                 return dma_ops->dma_supported(dev, mask);
 
@@ -231,57 +243,64 @@ EXPORT_SYMBOL(dma_set_mask);
    allowed  overwrite iommu off workarounds for specific chipsets.
    soft  Use software bounce buffering (default for Intel machines)
    noaperture Don't touch the aperture for AGP.
+   allowdac Allow DMA >4GB
+   nodac    Forbid DMA >4GB
+   panic    Force panic when IOMMU overflows
 */
 __init int iommu_setup(char *p)
 {
-    iommu_merge = 1;
+        iommu_merge = 1;
 
         if (!p)
                 return -EINVAL;
 
-    while (*p) {
-            if (!strncmp(p,"off",3))
-                    no_iommu = 1;
-            /* gart_parse_options has more force support */
-            if (!strncmp(p,"force",5))
-                    force_iommu = 1;
-            if (!strncmp(p,"noforce",7)) {
-                    iommu_merge = 0;
-                    force_iommu = 0;
-            }
-
-            if (!strncmp(p, "biomerge",8)) {
-                    iommu_bio_merge = 4096;
-                    iommu_merge = 1;
-                    force_iommu = 1;
-            }
-            if (!strncmp(p, "panic",5))
-                    panic_on_overflow = 1;
-            if (!strncmp(p, "nopanic",7))
-                    panic_on_overflow = 0;
-            if (!strncmp(p, "merge",5)) {
-                    iommu_merge = 1;
-                    force_iommu = 1;
-            }
-            if (!strncmp(p, "nomerge",7))
-                    iommu_merge = 0;
-            if (!strncmp(p, "forcesac",8))
-                    iommu_sac_force = 1;
+        while (*p) {
+                if (!strncmp(p,"off",3))
+                        no_iommu = 1;
+                /* gart_parse_options has more force support */
+                if (!strncmp(p,"force",5))
+                        force_iommu = 1;
+                if (!strncmp(p,"noforce",7)) {
+                        iommu_merge = 0;
+                        force_iommu = 0;
+                }
+
+                if (!strncmp(p, "biomerge",8)) {
+                        iommu_bio_merge = 4096;
+                        iommu_merge = 1;
+                        force_iommu = 1;
+                }
+                if (!strncmp(p, "panic",5))
+                        panic_on_overflow = 1;
+                if (!strncmp(p, "nopanic",7))
+                        panic_on_overflow = 0;
+                if (!strncmp(p, "merge",5)) {
+                        iommu_merge = 1;
+                        force_iommu = 1;
+                }
+                if (!strncmp(p, "nomerge",7))
+                        iommu_merge = 0;
+                if (!strncmp(p, "forcesac",8))
+                        iommu_sac_force = 1;
+                if (!strncmp(p, "allowdac", 8))
+                        forbid_dac = 0;
+                if (!strncmp(p, "nodac", 5))
+                        forbid_dac = -1;
 
 #ifdef CONFIG_SWIOTLB
-            if (!strncmp(p, "soft",4))
-                    swiotlb = 1;
+                if (!strncmp(p, "soft",4))
+                        swiotlb = 1;
 #endif
 
 #ifdef CONFIG_IOMMU
-            gart_parse_options(p);
+                gart_parse_options(p);
 #endif
 
-            p += strcspn(p, ",");
-            if (*p == ',')
-                    ++p;
-    }
-    return 0;
+                p += strcspn(p, ",");
+                if (*p == ',')
+                        ++p;
+        }
+        return 0;
 }
 early_param("iommu", iommu_setup);
 
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index 0b00bb2ea576..fc944b5e8f4a 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -123,9 +123,6 @@ struct resource standard_io_resources[] = {
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 };
 
-#define STANDARD_IO_RESOURCES \
-        (sizeof standard_io_resources / sizeof standard_io_resources[0])
-
 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
 
 struct resource data_resource = {
@@ -172,9 +169,6 @@ static struct resource adapter_rom_resources[] = {
                 .flags = IORESOURCE_ROM }
 };
 
-#define ADAPTER_ROM_RESOURCES \
-        (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0])
-
 static struct resource video_rom_resource = {
         .name = "Video ROM",
         .start = 0xc0000,
@@ -245,7 +239,8 @@ static void __init probe_roms(void)
         }
 
         /* check for adapter roms on 2k boundaries */
-        for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) {
+        for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper;
+             start += 2048) {
                 rom = isa_bus_to_virt(start);
                 if (!romsignature(rom))
                         continue;
@@ -537,7 +532,7 @@ void __init setup_arch(char **cmdline_p)
         {
         unsigned i;
         /* request I/O space for devices used on all i[345]86 PCs */
-        for (i = 0; i < STANDARD_IO_RESOURCES; i++)
+        for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
                 request_resource(&ioport_resource, &standard_io_resources[i]);
         }
 
diff --git a/arch/x86_64/kernel/vmlinux.lds.S b/arch/x86_64/kernel/vmlinux.lds.S
index d0564f1bcb0b..f8aeccf105fa 100644
--- a/arch/x86_64/kernel/vmlinux.lds.S
+++ b/arch/x86_64/kernel/vmlinux.lds.S
@@ -67,13 +67,6 @@ SECTIONS
 
   _edata = .;                   /* End of data section */
 
-  __bss_start = .;              /* BSS */
-  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
-        *(.bss.page_aligned)    
-        *(.bss)
-        }
-  __bss_stop = .;
-
   . = ALIGN(PAGE_SIZE);
   . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
   .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
@@ -229,6 +222,13 @@ SECTIONS
   . = ALIGN(4096);
   __nosave_end = .;
 
+  __bss_start = .;              /* BSS */
+  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
+        *(.bss.page_aligned)
+        *(.bss)
+        }
+  __bss_stop = .;
+
   _end = . ;
 
   /* Sections to be discarded */
diff --git a/arch/x86_64/kernel/vsyscall.c b/arch/x86_64/kernel/vsyscall.c
index ac48c3857ddb..07c086382059 100644
--- a/arch/x86_64/kernel/vsyscall.c
+++ b/arch/x86_64/kernel/vsyscall.c
@@ -155,8 +155,8 @@ vgetcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
            We do this here because otherwise user space would do it on
            its own in a likely inferior way (no access to jiffies).
            If you don't like it pass NULL. */
-        if (tcache && tcache->t0 == (j = __jiffies)) {
-                p = tcache->t1;
+        if (tcache && tcache->blob[0] == (j = __jiffies)) {
+                p = tcache->blob[1];
         } else if (__vgetcpu_mode == VGETCPU_RDTSCP) {
                 /* Load per CPU data from RDTSCP */
                 rdtscp(dummy, dummy, p);
@@ -165,8 +165,8 @@ vgetcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
                 asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
         }
         if (tcache) {
-                tcache->t0 = j;
-                tcache->t1 = p;
+                tcache->blob[0] = j;
+                tcache->blob[1] = p;
         }
         if (cpu)
                 *cpu = p & 0xfff;