Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-tip:
  x86, fpu: fix CONFIG_PREEMPT=y corruption of application's FPU stack
  suspend-vs-iommu: prevent suspend if we could not resume
  x86: section mismatch fix
  x86: fix Xorg crash with xf86MapVidMem error
  x86: fix pointer type warning in arch/x86/mm/init_64.c:early_memtest
  x86: fix bad pmd ffff810000207xxx(9090909090909090)
  x86: ioremap fix failing nesting check
  x86: fix broken math-emu with lazy allocation of fpu area
  x86: enable preemption in delay
  x86: disable preemption in native_smp_prepare_cpus
  x86: fix APIC warning on 32bit v2

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index c49ebcc..33c5216 100644 (file)
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -242,12 +242,19 @@ static int __init acpi_parse_madt(struct acpi_table_header *table)
 
 static void __cpuinit acpi_register_lapic(int id, u8 enabled)
 {
+       unsigned int ver = 0;
+
        if (!enabled) {
                ++disabled_cpus;
                return;
        }
 
-       generic_processor_info(id, 0);
+#ifdef CONFIG_X86_32
+       if (boot_cpu_physical_apicid != -1U)
+               ver = apic_version[boot_cpu_physical_apicid];
+#endif
+
+       generic_processor_info(id, ver);
 }
 
 static int __init
@@ -767,8 +774,13 @@ static void __init acpi_register_lapic_address(unsigned long address)
        mp_lapic_addr = address;
 
        set_fixmap_nocache(FIX_APIC_BASE, address);
-       if (boot_cpu_physical_apicid == -1U)
+       if (boot_cpu_physical_apicid == -1U) {
                boot_cpu_physical_apicid  = GET_APIC_ID(read_apic_id());
+#ifdef CONFIG_X86_32
+               apic_version[boot_cpu_physical_apicid] =
+                        GET_APIC_VERSION(apic_read(APIC_LVR));
+#endif
+       }
 }
 
 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index e03cc95..eb9ddd8 100644 (file)
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -56,6 +56,11 @@ void __cpuinit mxcsr_feature_mask_init(void)
 
 void __init init_thread_xstate(void)
 {
+       if (!HAVE_HWFP) {
+               xstate_size = sizeof(struct i387_soft_struct);
+               return;
+       }
+
        if (cpu_has_fxsr)
                xstate_size = sizeof(struct i387_fxsave_struct);
 #ifdef CONFIG_X86_32
@@ -94,7 +99,7 @@ void __cpuinit fpu_init(void)
 int init_fpu(struct task_struct *tsk)
 {
        if (tsk_used_math(tsk)) {
-               if (tsk == current)
+               if (HAVE_HWFP && tsk == current)
                        unlazy_fpu(tsk);
                return 0;
        }
@@ -109,6 +114,15 @@ int init_fpu(struct task_struct *tsk)
                        return -ENOMEM;
        }
 
+#ifdef CONFIG_X86_32
+       if (!HAVE_HWFP) {
+               memset(tsk->thread.xstate, 0, xstate_size);
+               finit();
+               set_stopped_child_used_math(tsk);
+               return 0;
+       }
+#endif
+
        if (cpu_has_fxsr) {
                struct i387_fxsave_struct *fx = &tsk->thread.xstate->fxsave;
 
@@ -330,13 +344,13 @@ int fpregs_get(struct task_struct *target, const struct user_regset *regset,
        struct user_i387_ia32_struct env;
        int ret;
 
-       if (!HAVE_HWFP)
-               return fpregs_soft_get(target, regset, pos, count, kbuf, ubuf);
-
        ret = init_fpu(target);
        if (ret)
                return ret;
 
+       if (!HAVE_HWFP)
+               return fpregs_soft_get(target, regset, pos, count, kbuf, ubuf);
+
        if (!cpu_has_fxsr) {
                return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                           &target->thread.xstate->fsave, 0,
@@ -360,15 +374,15 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
        struct user_i387_ia32_struct env;
        int ret;
 
-       if (!HAVE_HWFP)
-               return fpregs_soft_set(target, regset, pos, count, kbuf, ubuf);
-
        ret = init_fpu(target);
        if (ret)
                return ret;
 
        set_stopped_child_used_math(target);
 
+       if (!HAVE_HWFP)
+               return fpregs_soft_set(target, regset, pos, count, kbuf, ubuf);
+
        if (!cpu_has_fxsr) {
                return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                          &target->thread.xstate->fsave, 0, -1);
@@ -474,18 +488,18 @@ static int restore_i387_fxsave(struct _fpstate_ia32 __user *buf)
 int restore_i387_ia32(struct _fpstate_ia32 __user *buf)
 {
        int err;
+       struct task_struct *tsk = current;
 
-       if (HAVE_HWFP) {
-               struct task_struct *tsk = current;
-
+       if (HAVE_HWFP)
                clear_fpu(tsk);
 
-               if (!used_math()) {
-                       err = init_fpu(tsk);
-                       if (err)
-                               return err;
-               }
+       if (!used_math()) {
+               err = init_fpu(tsk);
+               if (err)
+                       return err;
+       }
 
+       if (HAVE_HWFP) {
                if (cpu_has_fxsr)
                        err = restore_i387_fxsave(buf);
                else

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index c07455d..aa8ec92 100644 (file)
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -26,6 +26,7 @@
 #include <linux/kdebug.h>
 #include <linux/scatterlist.h>
 #include <linux/iommu-helper.h>
+#include <linux/sysdev.h>
 #include <asm/atomic.h>
 #include <asm/io.h>
 #include <asm/mtrr.h>
@@ -548,6 +549,28 @@ static __init unsigned read_aperture(struct pci_dev *dev, u32 *size)
        return aper_base;
 }
 
+static int gart_resume(struct sys_device *dev)
+{
+       return 0;
+}
+
+static int gart_suspend(struct sys_device *dev, pm_message_t state)
+{
+       return -EINVAL;
+}
+
+static struct sysdev_class gart_sysdev_class = {
+       .name = "gart",
+       .suspend = gart_suspend,
+       .resume = gart_resume,
+
+};
+
+static struct sys_device device_gart = {
+       .id     = 0,
+       .cls    = &gart_sysdev_class,
+};
+
 /*
  * Private Northbridge GATT initialization in case we cannot use the
  * AGP driver for some reason.
@@ -558,7 +581,7 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
        unsigned aper_base, new_aper_base;
        struct pci_dev *dev;
        void *gatt;
-       int i;
+       int i, error;
 
        printk(KERN_INFO "PCI-DMA: Disabling AGP.\n");
        aper_size = aper_base = info->aper_size = 0;
@@ -606,6 +629,12 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
 
                pci_write_config_dword(dev, 0x90, ctl);
        }
+
+       error = sysdev_class_register(&gart_sysdev_class);
+       if (!error)
+               error = sysdev_register(&device_gart);
+       if (error)
+               panic("Could not register gart_sysdev -- would corrupt data on next suspend");
        flush_gart();
 
        printk(KERN_INFO "PCI-DMA: aperture base @ %x size %u KB\n",

diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index f8476df..6d54833 100644 (file)
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -649,8 +649,11 @@ struct task_struct * __switch_to(struct task_struct *prev_p, struct task_struct
        /* If the task has used fpu the last 5 timeslices, just do a full
         * restore of the math state immediately to avoid the trap; the
         * chances of needing FPU soon are obviously high now
+        *
+        * tsk_used_math() checks prevent calling math_state_restore(),
+        * which can sleep in the case of !tsk_used_math()
         */
-       if (next_p->fpu_counter > 5)
+       if (tsk_used_math(next_p) && next_p->fpu_counter > 5)
                math_state_restore();
 
        /*

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index e2319f3..ac54ff5 100644 (file)
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -658,8 +658,11 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
        /* If the task has used fpu the last 5 timeslices, just do a full
         * restore of the math state immediately to avoid the trap; the
         * chances of needing FPU soon are obviously high now
+        *
+        * tsk_used_math() checks prevent calling math_state_restore(),
+        * which can sleep in the case of !tsk_used_math()
         */
-       if (next_p->fpu_counter>5)
+       if (tsk_used_math(next_p) && next_p->fpu_counter > 5)
                math_state_restore();
        return prev_p;
 }

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 3898849..56078d6 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1190,6 +1190,7 @@ static void __init smp_cpu_index_default(void)
  */
 void __init native_smp_prepare_cpus(unsigned int max_cpus)
 {
+       preempt_disable();
        nmi_watchdog_default();
        smp_cpu_index_default();
        current_cpu_data = boot_cpu_data;
@@ -1206,7 +1207,7 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
        if (smp_sanity_check(max_cpus) < 0) {
                printk(KERN_INFO "SMP disabled\n");
                disable_smp();
-               return;
+               goto out;
        }
 
        preempt_disable();
@@ -1246,6 +1247,8 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
        printk(KERN_INFO "CPU%d: ", 0);
        print_cpu_info(&cpu_data(0));
        setup_boot_clock();
+out:
+       preempt_enable();
 }
 /*
  * Early setup to make printk work.

diff --git a/arch/x86/lib/delay_32.c b/arch/x86/lib/delay_32.c
index 4535e6d..d710f2d 100644 (file)
--- a/arch/x86/lib/delay_32.c
+++ b/arch/x86/lib/delay_32.c
@@ -44,13 +44,36 @@ static void delay_loop(unsigned long loops)
 static void delay_tsc(unsigned long loops)
 {
        unsigned long bclock, now;
+       int cpu;
 
-       preempt_disable();              /* TSC's are per-cpu */
+       preempt_disable();
+       cpu = smp_processor_id();
        rdtscl(bclock);
-       do {
-               rep_nop();
+       for (;;) {
                rdtscl(now);
-       } while ((now-bclock) < loops);
+               if ((now - bclock) >= loops)
+                       break;
+
+               /* Allow RT tasks to run */
+               preempt_enable();
+               rep_nop();
+               preempt_disable();
+
+               /*
+                * It is possible that we moved to another CPU, and
+                * since TSC's are per-cpu we need to calculate
+                * that. The delay must guarantee that we wait "at
+                * least" the amount of time. Being moved to another
+                * CPU could make the wait longer but we just need to
+                * make sure we waited long enough. Rebalance the
+                * counter for this CPU.
+                */
+               if (unlikely(cpu != smp_processor_id())) {
+                       loops -= (now - bclock);
+                       cpu = smp_processor_id();
+                       rdtscl(bclock);
+               }
+       }
        preempt_enable();
 }
 

diff --git a/arch/x86/lib/delay_64.c b/arch/x86/lib/delay_64.c
index bbc6105..4c441be 100644 (file)
--- a/arch/x86/lib/delay_64.c
+++ b/arch/x86/lib/delay_64.c
@@ -31,14 +31,36 @@ int __devinit read_current_timer(unsigned long *timer_value)
 void __delay(unsigned long loops)
 {
        unsigned bclock, now;
+       int cpu;
 
-       preempt_disable();              /* TSC's are pre-cpu */
+       preempt_disable();
+       cpu = smp_processor_id();
        rdtscl(bclock);
-       do {
-               rep_nop(); 
+       for (;;) {
                rdtscl(now);
+               if ((now - bclock) >= loops)
+                       break;
+
+               /* Allow RT tasks to run */
+               preempt_enable();
+               rep_nop();
+               preempt_disable();
+
+               /*
+                * It is possible that we moved to another CPU, and
+                * since TSC's are per-cpu we need to calculate
+                * that. The delay must guarantee that we wait "at
+                * least" the amount of time. Being moved to another
+                * CPU could make the wait longer but we just need to
+                * make sure we waited long enough. Rebalance the
+                * counter for this CPU.
+                */
+               if (unlikely(cpu != smp_processor_id())) {
+                       loops -= (now - bclock);
+                       cpu = smp_processor_id();
+                       rdtscl(bclock);
+               }
        }
-       while ((now-bclock) < loops);
        preempt_enable();
 }
 EXPORT_SYMBOL(__delay);

diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index 6e38d87..c7b06fe 100644 (file)
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -30,6 +30,7 @@
 #include <asm/uaccess.h>
 #include <asm/desc.h>
 #include <asm/user.h>
+#include <asm/i387.h>
 
 #include "fpu_system.h"
 #include "fpu_emu.h"
@@ -146,6 +147,13 @@ asmlinkage void math_emulate(long arg)
        unsigned long code_limit = 0;   /* Initialized to stop compiler warnings */
        struct desc_struct code_descriptor;
 
+       if (!used_math()) {
+               if (init_fpu(current)) {
+                       do_group_exit(SIGKILL);
+                       return;
+               }
+       }
+
 #ifdef RE_ENTRANT_CHECKING
        if (emulating) {
                printk("ERROR: wm-FPU-emu is not RE-ENTRANT!\n");
@@ -153,11 +161,6 @@ asmlinkage void math_emulate(long arg)
        RE_ENTRANT_CHECK_ON;
 #endif /* RE_ENTRANT_CHECKING */
 
-       if (!used_math()) {
-               finit();
-               set_used_math();
-       }
-
        SETUP_DATA_AREA(arg);
 
        FPU_ORIG_EIP = FPU_EIP;

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 32ba13b..156e6d7 100644 (file)
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -206,7 +206,7 @@ void __init cleanup_highmap(void)
        pmd_t *last_pmd = pmd + PTRS_PER_PMD;
 
        for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
-               if (!pmd_present(*pmd))
+               if (pmd_none(*pmd))
                        continue;
                if (vaddr < (unsigned long) _text || vaddr > end)
                        set_pmd(pmd, __pmd(0));
@@ -506,7 +506,7 @@ early_param("memtest", parse_memtest);
 
 static void __init early_memtest(unsigned long start, unsigned long end)
 {
-       unsigned long t_start, t_size;
+       u64 t_start, t_size;
        unsigned pattern;
 
        if (!memtest_pattern)
@@ -525,7 +525,7 @@ static void __init early_memtest(unsigned long start, unsigned long end)
                        if (t_start + t_size > end)
                                t_size = end - t_start;
 
-                       printk(KERN_CONT "\n  %016lx - %016lx pattern %d",
+                       printk(KERN_CONT "\n  %016llx - %016llx pattern %d",
                                t_start, t_start + t_size, pattern);
 
                        memtest(t_start, t_size, pattern);

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 71bb315..2b2bb3f 100644 (file)
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -593,10 +593,11 @@ void __init early_iounmap(void *addr, unsigned long size)
        unsigned long offset;
        unsigned int nrpages;
        enum fixed_addresses idx;
-       unsigned int nesting;
+       int nesting;
 
        nesting = --early_ioremap_nested;
-       WARN_ON(nesting < 0);
+       if (WARN_ON(nesting < 0))
+               return;
 
        if (early_ioremap_debug) {
                printk(KERN_INFO "early_iounmap(%p, %08lx) [%d]\n", addr,

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index de3a998..06b7a1c 100644 (file)
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -34,7 +34,7 @@ void __cpuinit pat_disable(char *reason)
        printk(KERN_INFO "%s\n", reason);
 }
 
-static int nopat(char *str)
+static int __init nopat(char *str)
 {
        pat_disable("PAT support disabled.");
        return 0;
@@ -151,32 +151,33 @@ static int pat_x_mtrr_type(u64 start, u64 end, unsigned long prot,
        unsigned long pat_type;
        u8 mtrr_type;
 
-       mtrr_type = mtrr_type_lookup(start, end);
-       if (mtrr_type == 0xFF) {                /* MTRR not enabled */
-               *ret_prot = prot;
-               return 0;
-       }
-       if (mtrr_type == 0xFE) {                /* MTRR match error */
-               *ret_prot = _PAGE_CACHE_UC;
-               return -1;
-       }
-       if (mtrr_type != MTRR_TYPE_UNCACHABLE &&
-           mtrr_type != MTRR_TYPE_WRBACK &&
-           mtrr_type != MTRR_TYPE_WRCOMB) {    /* MTRR type unhandled */
-               *ret_prot = _PAGE_CACHE_UC;
-               return -1;
-       }
-
        pat_type = prot & _PAGE_CACHE_MASK;
        prot &= (~_PAGE_CACHE_MASK);
 
-       /* Currently doing intersection by hand. Optimize it later. */
+       /*
+        * We return the PAT request directly for types where PAT takes
+        * precedence with respect to MTRR and for UC_MINUS.
+        * Consistency checks with other PAT requests is done later
+        * while going through memtype list.
+        */
        if (pat_type == _PAGE_CACHE_WC) {
                *ret_prot = prot | _PAGE_CACHE_WC;
+               return 0;
        } else if (pat_type == _PAGE_CACHE_UC_MINUS) {
                *ret_prot = prot | _PAGE_CACHE_UC_MINUS;
-       } else if (pat_type == _PAGE_CACHE_UC ||
-                  mtrr_type == MTRR_TYPE_UNCACHABLE) {
+               return 0;
+       } else if (pat_type == _PAGE_CACHE_UC) {
+               *ret_prot = prot | _PAGE_CACHE_UC;
+               return 0;
+       }
+
+       /*
+        * Look for MTRR hint to get the effective type in case where PAT
+        * request is for WB.
+        */
+       mtrr_type = mtrr_type_lookup(start, end);
+
+       if (mtrr_type == MTRR_TYPE_UNCACHABLE) {
                *ret_prot = prot | _PAGE_CACHE_UC;
        } else if (mtrr_type == MTRR_TYPE_WRCOMB) {
                *ret_prot = prot | _PAGE_CACHE_WC;
@@ -233,14 +234,12 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
 
        if (req_type == -1) {
                /*
-                * Special case where caller wants to inherit from mtrr or
-                * existing pat mapping, defaulting to UC_MINUS in case of
-                * no match.
+                * Call mtrr_lookup to get the type hint. This is an
+                * optimization for /dev/mem mmap'ers into WB memory (BIOS
+                * tools and ACPI tools). Use WB request for WB memory and use
+                * UC_MINUS otherwise.
                 */
                u8 mtrr_type = mtrr_type_lookup(start, end);
-               if (mtrr_type == 0xFE) { /* MTRR match error */
-                       err = -1;
-               }
 
                if (mtrr_type == MTRR_TYPE_WRBACK) {
                        req_type = _PAGE_CACHE_WB;

diff --git a/include/asm-x86/i387.h b/include/asm-x86/i387.h
index 6b722d3..37672f7 100644 (file)
--- a/include/asm-x86/i387.h
+++ b/include/asm-x86/i387.h
@@ -193,6 +193,8 @@ static inline int restore_i387(struct _fpstate __user *buf)
 
 #else  /* CONFIG_X86_32 */
 
+extern void finit(void);
+
 static inline void tolerant_fwait(void)
 {
        asm volatile("fnclex ; fwait");