Re: Linux 2.6.30.9

From: Greg KH
Date: Mon Oct 05 2009 - 13:30:36 EST

diff --git a/Makefile b/Makefile
index 43f5f42..2f0ce00 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
VERSION = 2
PATCHLEVEL = 6
SUBLEVEL = 30
-EXTRAVERSION = .8
+EXTRAVERSION = .9
NAME = Man-Eating Seals of Antiquity

# *DOCUMENTATION*
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index a7e210b..0cd2e34 100644
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -176,7 +176,7 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
#define HAVE_PAGE_AGP

/* Advertise support for _PAGE_SPECIAL */
-#ifdef _PAGE_SPECIAL
+#if _PAGE_SPECIAL != 0
#define __HAVE_ARCH_PTE_SPECIAL
#endif

diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index ae1d67c..f1d5f0c 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -30,6 +30,8 @@
#include <asm/tlbflush.h>
#include <asm/tlb.h>

+#include "mmu_decl.h"
+
static DEFINE_PER_CPU(struct pte_freelist_batch *, pte_freelist_cur);
static unsigned long pte_freelist_forced_free;

@@ -119,7 +121,7 @@ void pte_free_finish(void)
/*
* Handle i/d cache flushing, called from set_pte_at() or ptep_set_access_flags()
*/
-static pte_t do_dcache_icache_coherency(pte_t pte)
+static pte_t do_dcache_icache_coherency(pte_t pte, unsigned long addr)
{
unsigned long pfn = pte_pfn(pte);
struct page *page;
@@ -128,6 +130,17 @@ static pte_t do_dcache_icache_coherency(pte_t pte)
return pte;
page = pfn_to_page(pfn);

+#ifdef CONFIG_8xx
+ /* On 8xx, cache control instructions (particularly
+ * "dcbst" from flush_dcache_icache) fault as write
+ * operation if there is an unpopulated TLB entry
+ * for the address in question. To workaround that,
+ * we invalidate the TLB here, thus avoiding dcbst
+ * misbehaviour.
+ */
+ _tlbil_va(addr, 0 /* 8xx doesn't care about PID */);
+#endif
+
if (!PageReserved(page) && !test_bit(PG_arch_1, &page->flags)) {
pr_debug("do_dcache_icache_coherency... flushing\n");
flush_dcache_icache_page(page);
@@ -198,7 +211,7 @@ void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte
*/
pte = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
if (pte_need_exec_flush(pte, 1))
- pte = do_dcache_icache_coherency(pte);
+ pte = do_dcache_icache_coherency(pte, addr);

/* Perform the setting of the PTE */
__set_pte_at(mm, addr, ptep, pte, 0);
@@ -216,7 +229,7 @@ int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
{
int changed;
if (!dirty && pte_need_exec_flush(entry, 0))
- entry = do_dcache_icache_coherency(entry);
+ entry = do_dcache_icache_coherency(entry, address);
changed = !pte_same(*(ptep), entry);
if (changed) {
if (!(vma->vm_flags & VM_HUGETLB))
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 9a9efb0..e8b9c8c 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -620,6 +620,7 @@ void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
u32 error_code);
+bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl);

int kvm_pic_set_irq(void *opaque, int irq, int level);

diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index cf52215..66a37cf 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -618,9 +618,10 @@ static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst,
return 0;
}

-static void invalidate_entry(struct powernow_k8_data *data, unsigned int entry)
+static void invalidate_entry(struct cpufreq_frequency_table *powernow_table,
+ unsigned int entry)
{
- data->powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
+ powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
}

static void print_basics(struct powernow_k8_data *data)
@@ -926,13 +927,13 @@ static int fill_powernow_table_pstate(struct powernow_k8_data *data,
"bad value %d.\n", i, index);
printk(KERN_ERR PFX "Please report to BIOS "
"manufacturer\n");
- invalidate_entry(data, i);
+ invalidate_entry(powernow_table, i);
continue;
}
rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
if (!(hi & HW_PSTATE_VALID_MASK)) {
dprintk("invalid pstate %d, ignoring\n", index);
- invalidate_entry(data, i);
+ invalidate_entry(powernow_table, i);
continue;
}

@@ -982,7 +983,7 @@ static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
/* verify frequency is OK */
if ((freq > (MAX_FREQ * 1000)) || (freq < (MIN_FREQ * 1000))) {
dprintk("invalid freq %u kHz, ignoring\n", freq);
- invalidate_entry(data, i);
+ invalidate_entry(powernow_table, i);
continue;
}

@@ -990,7 +991,7 @@ static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
* BIOSs are using "off" to indicate invalid */
if (vid == VID_OFF) {
dprintk("invalid vid %u, ignoring\n", vid);
- invalidate_entry(data, i);
+ invalidate_entry(powernow_table, i);
continue;
}

@@ -1021,7 +1022,7 @@ static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
(unsigned int)
(data->acpi_data.states[i].core_frequency
* 1000));
- invalidate_entry(data, i);
+ invalidate_entry(powernow_table, i);
continue;
}
}
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 223af43..e5efcdc 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -50,8 +50,8 @@ static unsigned long kvm_get_wallclock(void)
struct timespec ts;
int low, high;

- low = (int)__pa(&wall_clock);
- high = ((u64)__pa(&wall_clock) >> 32);
+ low = (int)__pa_symbol(&wall_clock);
+ high = ((u64)__pa_symbol(&wall_clock) >> 32);
native_write_msr(MSR_KVM_WALL_CLOCK, low, high);

vcpu_time = &get_cpu_var(hv_clock);
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index f0b67f2..dba1f4d 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -635,6 +635,15 @@ static void start_apic_timer(struct kvm_lapic *apic)

if (!apic->timer.period)
return;
+ /*
+ * Do not allow the guest to program periodic timers with small
+ * interval, since the hrtimers are not throttled by the host
+ * scheduler.
+ */
+ if (apic_lvtt_period(apic)) {
+ if (apic->timer.period < NSEC_PER_MSEC/2)
+ apic->timer.period = NSEC_PER_MSEC/2;
+ }

hrtimer_start(&apic->timer.dev,
ktime_add_ns(now, apic->timer.period),
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index d7ce26b..0c43e13 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2612,7 +2612,8 @@ EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page_virt);

void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
{
- while (vcpu->kvm->arch.n_free_mmu_pages < KVM_REFILL_PAGES) {
+ while (vcpu->kvm->arch.n_free_mmu_pages < KVM_REFILL_PAGES &&
+ !list_empty(&vcpu->kvm->arch.active_mmu_pages)) {
struct kvm_mmu_page *sp;

sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev,
@@ -2691,12 +2692,6 @@ static int alloc_mmu_pages(struct kvm_vcpu *vcpu)

ASSERT(vcpu);

- if (vcpu->kvm->arch.n_requested_mmu_pages)
- vcpu->kvm->arch.n_free_mmu_pages =
- vcpu->kvm->arch.n_requested_mmu_pages;
- else
- vcpu->kvm->arch.n_free_mmu_pages =
- vcpu->kvm->arch.n_alloc_mmu_pages;
/*
* When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.
* Therefore we need to allocate shadow page tables in the first
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 1a0d5cd..691f8e0 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1206,12 +1206,9 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
/* CR3 accesses and invlpg don't need to cause VM Exits when EPT
enabled */
- min &= ~(CPU_BASED_CR3_LOAD_EXITING |
- CPU_BASED_CR3_STORE_EXITING |
- CPU_BASED_INVLPG_EXITING);
- if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
- &_cpu_based_exec_control) < 0)
- return -EIO;
+ _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING |
+ CPU_BASED_CR3_STORE_EXITING |
+ CPU_BASED_INVLPG_EXITING);
rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
vmx_capability.ept, vmx_capability.vpid);
}
@@ -2865,6 +2862,8 @@ static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
unsigned long val;
int dr, reg;

+ if (!kvm_require_cpl(vcpu, 0))
+ return 1;
dr = vmcs_readl(GUEST_DR7);
if (dr & DR7_GD) {
/*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0b1bfc6..ec56c78 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -217,6 +217,19 @@ static void __queue_exception(struct kvm_vcpu *vcpu)
}

/*
+ * Checks if cpl <= required_cpl; if true, return true. Otherwise queue
+ * a #GP and return false.
+ */
+bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
+{
+ if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
+ return true;
+ kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
+ return false;
+}
+EXPORT_SYMBOL_GPL(kvm_require_cpl);
+
+/*
* Load the pae pdptrs. Return true is they are all valid.
*/
int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
@@ -1425,6 +1438,10 @@ static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
do_cpuid_ent(&cpuid_entries[nent], func, 0,
&nent, cpuid->nent);
+ r = -E2BIG;
+ if (nent >= cpuid->nent)
+ goto out_free;
+
r = -EFAULT;
if (copy_to_user(entries, cpuid_entries,
nent * sizeof(struct kvm_cpuid_entry2)))
@@ -2885,6 +2902,11 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
a3 &= 0xFFFFFFFF;
}

+ if (kvm_x86_ops->get_cpl(vcpu) != 0) {
+ ret = -KVM_EPERM;
+ goto out;
+ }
+
switch (nr) {
case KVM_HC_VAPIC_POLL_IRQ:
ret = 0;
@@ -2896,6 +2918,7 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
ret = -KVM_ENOSYS;
break;
}
+out:
kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
++vcpu->stat.hypercalls;
return r;
@@ -3989,13 +4012,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,

vcpu->arch.cr2 = sregs->cr2;
mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
-
- down_read(&vcpu->kvm->slots_lock);
- if (gfn_to_memslot(vcpu->kvm, sregs->cr3 >> PAGE_SHIFT))
- vcpu->arch.cr3 = sregs->cr3;
- else
- set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
- up_read(&vcpu->kvm->slots_lock);
+ vcpu->arch.cr3 = sregs->cr3;

kvm_set_cr8(vcpu, sregs->cr8);

diff --git a/drivers/acpi/pci_slot.c b/drivers/acpi/pci_slot.c
index 12158e0..da9d6d2 100644
--- a/drivers/acpi/pci_slot.c
+++ b/drivers/acpi/pci_slot.c
@@ -57,7 +57,7 @@ ACPI_MODULE_NAME("pci_slot");
MY_NAME , ## arg); \
} while (0)

-#define SLOT_NAME_SIZE 20 /* Inspired by #define in acpiphp.h */
+#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */

struct acpi_pci_slot {
acpi_handle root_handle; /* handle of the root bridge */
@@ -149,7 +149,7 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
return AE_OK;
}

- snprintf(name, sizeof(name), "%u", (u32)sun);
+ snprintf(name, sizeof(name), "%llu", sun);
pci_slot = pci_create_slot(pci_bus, device, name, NULL);
if (IS_ERR(pci_slot)) {
err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 6b91c26..bc06245 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -2744,8 +2744,8 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if (board_id == board_ahci_sb700 && pdev->revision >= 0x40)
hpriv->flags &= ~AHCI_HFLAG_IGN_SERR_INTERNAL;

- if (!(hpriv->flags & AHCI_HFLAG_NO_MSI))
- pci_enable_msi(pdev);
+ if ((hpriv->flags & AHCI_HFLAG_NO_MSI) || pci_enable_msi(pdev))
+ pci_intx(pdev, 1);

/* save initial config */
ahci_save_initial_config(pdev, hpriv);
diff --git a/drivers/net/wireless/p54/p54usb.c b/drivers/net/wireless/p54/p54usb.c
index 6cc6cbc..0d72890 100644
--- a/drivers/net/wireless/p54/p54usb.c
+++ b/drivers/net/wireless/p54/p54usb.c
@@ -66,6 +66,7 @@ static struct usb_device_id p54u_table[] __devinitdata = {
{USB_DEVICE(0x0bf8, 0x1009)}, /* FUJITSU E-5400 USB D1700*/
{USB_DEVICE(0x0cde, 0x0006)}, /* Medion MD40900 */
{USB_DEVICE(0x0cde, 0x0008)}, /* Sagem XG703A */
+ {USB_DEVICE(0x0cde, 0x0015)}, /* Zcomax XG-705A */
{USB_DEVICE(0x0d8e, 0x3762)}, /* DLink DWL-G120 Cohiba */
{USB_DEVICE(0x124a, 0x4025)}, /* IOGear GWU513 (GW3887IK chip) */
{USB_DEVICE(0x1260, 0xee22)}, /* SMC 2862W-G version 2 */
diff --git a/drivers/pcmcia/at91_cf.c b/drivers/pcmcia/at91_cf.c
index 9e1140f..e1dcced 100644
--- a/drivers/pcmcia/at91_cf.c
+++ b/drivers/pcmcia/at91_cf.c
@@ -363,7 +363,7 @@ static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
struct at91_cf_socket *cf = platform_get_drvdata(pdev);
struct at91_cf_data *board = cf->board;

- pcmcia_socket_dev_suspend(&pdev->dev, mesg);
+ pcmcia_socket_dev_suspend(&pdev->dev);
if (device_may_wakeup(&pdev->dev)) {
enable_irq_wake(board->det_pin);
if (board->irq_pin)
diff --git a/drivers/pcmcia/au1000_generic.c b/drivers/pcmcia/au1000_generic.c
index 9001334..0208870 100644
--- a/drivers/pcmcia/au1000_generic.c
+++ b/drivers/pcmcia/au1000_generic.c
@@ -515,7 +515,7 @@ static int au1x00_drv_pcmcia_probe(struct platform_device *dev)
static int au1x00_drv_pcmcia_suspend(struct platform_device *dev,
pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int au1x00_drv_pcmcia_resume(struct platform_device *dev)
diff --git a/drivers/pcmcia/bfin_cf_pcmcia.c b/drivers/pcmcia/bfin_cf_pcmcia.c
index b59d411..300b368 100644
--- a/drivers/pcmcia/bfin_cf_pcmcia.c
+++ b/drivers/pcmcia/bfin_cf_pcmcia.c
@@ -302,7 +302,7 @@ static int __devexit bfin_cf_remove(struct platform_device *pdev)

static int bfin_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
{
- return pcmcia_socket_dev_suspend(&pdev->dev, mesg);
+ return pcmcia_socket_dev_suspend(&pdev->dev);
}

static int bfin_cf_resume(struct platform_device *pdev)
diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index 0660ad1..934d4be 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -101,7 +101,7 @@ EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
static int socket_resume(struct pcmcia_socket *skt);
static int socket_suspend(struct pcmcia_socket *skt);

-int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state)
+int pcmcia_socket_dev_suspend(struct device *dev)
{
struct pcmcia_socket *socket;

diff --git a/drivers/pcmcia/i82092.c b/drivers/pcmcia/i82092.c
index 46561fa..a04f21c 100644
--- a/drivers/pcmcia/i82092.c
+++ b/drivers/pcmcia/i82092.c
@@ -42,7 +42,7 @@ MODULE_DEVICE_TABLE(pci, i82092aa_pci_ids);
#ifdef CONFIG_PM
static int i82092aa_socket_suspend (struct pci_dev *dev, pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int i82092aa_socket_resume (struct pci_dev *dev)
diff --git a/drivers/pcmcia/i82365.c b/drivers/pcmcia/i82365.c
index 40d4953..b906abe 100644
--- a/drivers/pcmcia/i82365.c
+++ b/drivers/pcmcia/i82365.c
@@ -1241,7 +1241,7 @@ static int pcic_init(struct pcmcia_socket *s)
static int i82365_drv_pcmcia_suspend(struct platform_device *dev,
pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int i82365_drv_pcmcia_resume(struct platform_device *dev)
diff --git a/drivers/pcmcia/m32r_cfc.c b/drivers/pcmcia/m32r_cfc.c
index 62b4ecc..d1d89c4 100644
--- a/drivers/pcmcia/m32r_cfc.c
+++ b/drivers/pcmcia/m32r_cfc.c
@@ -699,7 +699,7 @@ static struct pccard_operations pcc_operations = {
static int cfc_drv_pcmcia_suspend(struct platform_device *dev,
pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int cfc_drv_pcmcia_resume(struct platform_device *dev)
diff --git a/drivers/pcmcia/m32r_pcc.c b/drivers/pcmcia/m32r_pcc.c
index 12034b4..a065583 100644
--- a/drivers/pcmcia/m32r_pcc.c
+++ b/drivers/pcmcia/m32r_pcc.c
@@ -675,7 +675,7 @@ static struct pccard_operations pcc_operations = {
static int pcc_drv_pcmcia_suspend(struct platform_device *dev,
pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int pcc_drv_pcmcia_resume(struct platform_device *dev)
diff --git a/drivers/pcmcia/m8xx_pcmcia.c b/drivers/pcmcia/m8xx_pcmcia.c
index d1ad096..c69f2c4 100644
--- a/drivers/pcmcia/m8xx_pcmcia.c
+++ b/drivers/pcmcia/m8xx_pcmcia.c
@@ -1296,7 +1296,7 @@ static int m8xx_remove(struct of_device *ofdev)
#ifdef CONFIG_PM
static int m8xx_suspend(struct platform_device *pdev, pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&pdev->dev, state);
+ return pcmcia_socket_dev_suspend(&pdev->dev);
}

static int m8xx_resume(struct platform_device *pdev)
diff --git a/drivers/pcmcia/omap_cf.c b/drivers/pcmcia/omap_cf.c
index f373639..68570bc 100644
--- a/drivers/pcmcia/omap_cf.c
+++ b/drivers/pcmcia/omap_cf.c
@@ -334,7 +334,7 @@ static int __exit omap_cf_remove(struct platform_device *pdev)

static int omap_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
{
- return pcmcia_socket_dev_suspend(&pdev->dev, mesg);
+ return pcmcia_socket_dev_suspend(&pdev->dev);
}

static int omap_cf_resume(struct platform_device *pdev)
diff --git a/drivers/pcmcia/pd6729.c b/drivers/pcmcia/pd6729.c
index 8bed1da..1c39d34 100644
--- a/drivers/pcmcia/pd6729.c
+++ b/drivers/pcmcia/pd6729.c
@@ -758,7 +758,7 @@ static void __devexit pd6729_pci_remove(struct pci_dev *dev)
#ifdef CONFIG_PM
static int pd6729_socket_suspend(struct pci_dev *dev, pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int pd6729_socket_resume(struct pci_dev *dev)
diff --git a/drivers/pcmcia/pxa2xx_base.c b/drivers/pcmcia/pxa2xx_base.c
index c49a726..86ad876 100644
--- a/drivers/pcmcia/pxa2xx_base.c
+++ b/drivers/pcmcia/pxa2xx_base.c
@@ -302,7 +302,7 @@ static int pxa2xx_drv_pcmcia_remove(struct platform_device *dev)

static int pxa2xx_drv_pcmcia_suspend(struct platform_device *dev, pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int pxa2xx_drv_pcmcia_resume(struct platform_device *dev)
diff --git a/drivers/pcmcia/sa1100_generic.c b/drivers/pcmcia/sa1100_generic.c
index d8da5ac..2d0e997 100644
--- a/drivers/pcmcia/sa1100_generic.c
+++ b/drivers/pcmcia/sa1100_generic.c
@@ -89,7 +89,7 @@ static int sa11x0_drv_pcmcia_remove(struct platform_device *dev)
static int sa11x0_drv_pcmcia_suspend(struct platform_device *dev,
pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int sa11x0_drv_pcmcia_resume(struct platform_device *dev)
diff --git a/drivers/pcmcia/sa1111_generic.c b/drivers/pcmcia/sa1111_generic.c
index 401052a..4be4e17 100644
--- a/drivers/pcmcia/sa1111_generic.c
+++ b/drivers/pcmcia/sa1111_generic.c
@@ -159,7 +159,7 @@ static int __devexit pcmcia_remove(struct sa1111_dev *dev)

static int pcmcia_suspend(struct sa1111_dev *dev, pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int pcmcia_resume(struct sa1111_dev *dev)
diff --git a/drivers/pcmcia/tcic.c b/drivers/pcmcia/tcic.c
index 9ad97ea..9974410 100644
--- a/drivers/pcmcia/tcic.c
+++ b/drivers/pcmcia/tcic.c
@@ -366,7 +366,7 @@ static int __init get_tcic_id(void)
static int tcic_drv_pcmcia_suspend(struct platform_device *dev,
pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int tcic_drv_pcmcia_resume(struct platform_device *dev)
diff --git a/drivers/pcmcia/vrc4171_card.c b/drivers/pcmcia/vrc4171_card.c
index 659421d..05144e7 100644
--- a/drivers/pcmcia/vrc4171_card.c
+++ b/drivers/pcmcia/vrc4171_card.c
@@ -707,7 +707,7 @@ __setup("vrc4171_card=", vrc4171_card_setup);
static int vrc4171_card_suspend(struct platform_device *dev,
pm_message_t state)
{
- return pcmcia_socket_dev_suspend(&dev->dev, state);
+ return pcmcia_socket_dev_suspend(&dev->dev);
}

static int vrc4171_card_resume(struct platform_device *dev)
diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index 3ecd7c9..f728a45 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -1225,60 +1225,71 @@ static int __devinit yenta_probe (struct pci_dev *dev, const struct pci_device_i
}

#ifdef CONFIG_PM
-static int yenta_dev_suspend (struct pci_dev *dev, pm_message_t state)
+static int yenta_dev_suspend_noirq(struct device *dev)
{
- struct yenta_socket *socket = pci_get_drvdata(dev);
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct yenta_socket *socket = pci_get_drvdata(pdev);
int ret;

- ret = pcmcia_socket_dev_suspend(&dev->dev, state);
+ ret = pcmcia_socket_dev_suspend(dev);

- if (socket) {
- if (socket->type && socket->type->save_state)
- socket->type->save_state(socket);
+ if (!socket)
+ return ret;

- /* FIXME: pci_save_state needs to have a better interface */
- pci_save_state(dev);
- pci_read_config_dword(dev, 16*4, &socket->saved_state[0]);
- pci_read_config_dword(dev, 17*4, &socket->saved_state[1]);
- pci_disable_device(dev);
+ if (socket->type && socket->type->save_state)
+ socket->type->save_state(socket);

- /*
- * Some laptops (IBM T22) do not like us putting the Cardbus
- * bridge into D3. At a guess, some other laptop will
- * probably require this, so leave it commented out for now.
- */
- /* pci_set_power_state(dev, 3); */
- }
+ pci_save_state(pdev);
+ pci_read_config_dword(pdev, 16*4, &socket->saved_state[0]);
+ pci_read_config_dword(pdev, 17*4, &socket->saved_state[1]);
+ pci_disable_device(pdev);
+
+ /*
+ * Some laptops (IBM T22) do not like us putting the Cardbus
+ * bridge into D3. At a guess, some other laptop will
+ * probably require this, so leave it commented out for now.
+ */
+ /* pci_set_power_state(dev, 3); */

return ret;
}

-
-static int yenta_dev_resume (struct pci_dev *dev)
+static int yenta_dev_resume_noirq(struct device *dev)
{
- struct yenta_socket *socket = pci_get_drvdata(dev);
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct yenta_socket *socket = pci_get_drvdata(pdev);
+ int ret;

- if (socket) {
- int rc;
+ if (!socket)
+ return 0;

- pci_set_power_state(dev, 0);
- /* FIXME: pci_restore_state needs to have a better interface */
- pci_restore_state(dev);
- pci_write_config_dword(dev, 16*4, socket->saved_state[0]);
- pci_write_config_dword(dev, 17*4, socket->saved_state[1]);
+ pci_write_config_dword(pdev, 16*4, socket->saved_state[0]);
+ pci_write_config_dword(pdev, 17*4, socket->saved_state[1]);

- rc = pci_enable_device(dev);
- if (rc)
- return rc;
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return ret;

- pci_set_master(dev);
+ pci_set_master(pdev);

- if (socket->type && socket->type->restore_state)
- socket->type->restore_state(socket);
- }
+ if (socket->type && socket->type->restore_state)
+ socket->type->restore_state(socket);

- return pcmcia_socket_dev_resume(&dev->dev);
+ return pcmcia_socket_dev_resume(dev);
}
+
+static struct dev_pm_ops yenta_pm_ops = {
+ .suspend_noirq = yenta_dev_suspend_noirq,
+ .resume_noirq = yenta_dev_resume_noirq,
+ .freeze_noirq = yenta_dev_suspend_noirq,
+ .thaw_noirq = yenta_dev_resume_noirq,
+ .poweroff_noirq = yenta_dev_suspend_noirq,
+ .restore_noirq = yenta_dev_resume_noirq,
+};
+
+#define YENTA_PM_OPS (&yenta_pm_ops)
+#else
+#define YENTA_PM_OPS NULL
#endif

#define CB_ID(vend,dev,type) \
@@ -1376,10 +1387,7 @@ static struct pci_driver yenta_cardbus_driver = {
.id_table = yenta_table,
.probe = yenta_probe,
.remove = __devexit_p(yenta_close),
-#ifdef CONFIG_PM
- .suspend = yenta_dev_suspend,
- .resume = yenta_dev_resume,
-#endif
+ .driver.pm = YENTA_PM_OPS,
};


diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 912be65..7cd6d11 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -286,6 +286,8 @@ struct thinkpad_id_data {

u16 bios_model; /* Big Endian, TP-1Y = 0x5931, 0 = unknown */
u16 ec_model;
+ u16 bios_release; /* 1ZETK1WW = 0x314b, 0 = unknown */
+ u16 ec_release;

char *model_str; /* ThinkPad T43 */
char *nummodel_str; /* 9384A9C for a 9384-A9C model */
@@ -362,6 +364,45 @@ static void tpacpi_log_usertask(const char * const what)
} \
} while (0)

+#define TPACPI_MATCH_ANY 0xffffU
+#define TPACPI_MATCH_UNKNOWN 0U
+
+/* TPID('1', 'Y') == 0x5931 */
+#define TPID(__c1, __c2) (((__c2) << 8) | (__c1))
+
+#define TPACPI_Q_IBM(__id1, __id2, __quirk) \
+ { .vendor = PCI_VENDOR_ID_IBM, \
+ .bios = TPID(__id1, __id2), \
+ .ec = TPACPI_MATCH_ANY, \
+ .quirks = (__quirk) }
+
+struct tpacpi_quirk {
+ unsigned int vendor;
+ u16 bios;
+ u16 ec;
+ unsigned long quirks;
+};
+
+static unsigned long __init tpacpi_check_quirks(
+ const struct tpacpi_quirk *qlist,
+ unsigned int qlist_size)
+{
+ while (qlist_size) {
+ if ((qlist->vendor == thinkpad_id.vendor ||
+ qlist->vendor == TPACPI_MATCH_ANY) &&
+ (qlist->bios == thinkpad_id.bios_model ||
+ qlist->bios == TPACPI_MATCH_ANY) &&
+ (qlist->ec == thinkpad_id.ec_model ||
+ qlist->ec == TPACPI_MATCH_ANY))
+ return qlist->quirks;
+
+ qlist_size--;
+ qlist++;
+ }
+ return 0;
+}
+
+
/****************************************************************************
****************************************************************************
*
@@ -5757,14 +5798,27 @@ static struct backlight_ops ibm_backlight_data = {

/* --------------------------------------------------------------------- */

+#define TPACPI_BRGHT_Q_EC 0x0002 /* Should or must use EC HBRV */
+
+static const struct tpacpi_quirk brightness_quirk_table[] __initconst = {
+ TPACPI_Q_IBM('1', 'Y', TPACPI_BRGHT_Q_EC),
+ TPACPI_Q_IBM('1', 'Q', TPACPI_BRGHT_Q_EC),
+ TPACPI_Q_IBM('7', '6', TPACPI_BRGHT_Q_EC),
+ TPACPI_Q_IBM('7', '8', TPACPI_BRGHT_Q_EC),
+};
+
static int __init brightness_init(struct ibm_init_struct *iibm)
{
int b;
+ unsigned long quirks;

vdbg_printk(TPACPI_DBG_INIT, "initializing brightness subdriver\n");

mutex_init(&brightness_mutex);

+ quirks = tpacpi_check_quirks(brightness_quirk_table,
+ ARRAY_SIZE(brightness_quirk_table));
+
/*
* We always attempt to detect acpi support, so as to switch
* Lenovo Vista BIOS to ACPI brightness mode even if we are not
@@ -5821,19 +5875,9 @@ static int __init brightness_init(struct ibm_init_struct *iibm)
/* TPACPI_BRGHT_MODE_AUTO not implemented yet, just use default */
if (brightness_mode == TPACPI_BRGHT_MODE_AUTO ||
brightness_mode == TPACPI_BRGHT_MODE_MAX) {
- if (thinkpad_id.vendor == PCI_VENDOR_ID_IBM) {
- /*
- * IBM models that define HBRV probably have
- * EC-based backlight level control
- */
- if (acpi_evalf(ec_handle, NULL, "HBRV", "qd"))
- /* T40-T43, R50-R52, R50e, R51e, X31-X41 */
- brightness_mode = TPACPI_BRGHT_MODE_ECNVRAM;
- else
- /* all other IBM ThinkPads */
- brightness_mode = TPACPI_BRGHT_MODE_UCMS_STEP;
- } else
- /* All Lenovo ThinkPads */
+ if (quirks & TPACPI_BRGHT_Q_EC)
+ brightness_mode = TPACPI_BRGHT_MODE_ECNVRAM;
+ else
brightness_mode = TPACPI_BRGHT_MODE_UCMS_STEP;

dbg_printk(TPACPI_DBG_BRGHT,
@@ -7387,6 +7431,8 @@ static int __must_check __init get_thinkpad_model_data(
return 0;
tp->bios_model = tp->bios_version_str[0]
| (tp->bios_version_str[1] << 8);
+ tp->bios_release = (tp->bios_version_str[4] << 8)
+ | tp->bios_version_str[5];

/*
* ThinkPad T23 or newer, A31 or newer, R50e or newer,
@@ -7407,6 +7453,8 @@ static int __must_check __init get_thinkpad_model_data(
return -ENOMEM;
tp->ec_model = ec_fw_string[0]
| (ec_fw_string[1] << 8);
+ tp->ec_release = (ec_fw_string[4] << 8)
+ | ec_fw_string[5];
break;
}
}
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index a61ab77..115036f 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -544,9 +544,9 @@ require use of the stronger protocol */
#define CIFSSEC_MUST_LANMAN 0x10010
#define CIFSSEC_MUST_PLNTXT 0x20020
#ifdef CONFIG_CIFS_UPCALL
-#define CIFSSEC_MASK 0xAF0AF /* allows weak security but also krb5 */
+#define CIFSSEC_MASK 0xBF0BF /* allows weak security but also krb5 */
#else
-#define CIFSSEC_MASK 0xA70A7 /* current flags supported if weak */
+#define CIFSSEC_MASK 0xB70B7 /* current flags supported if weak */
#endif /* UPCALL */
#else /* do not allow weak pw hash */
#ifdef CONFIG_CIFS_UPCALL
diff --git a/fs/inode.c b/fs/inode.c
index a9e8ef0..d69a0eb 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -672,13 +672,15 @@ void unlock_new_inode(struct inode *inode)
}
#endif
/*
- * This is special! We do not need the spinlock
- * when clearing I_LOCK, because we're guaranteed
- * that nobody else tries to do anything about the
- * state of the inode when it is locked, as we
- * just created it (so there can be no old holders
- * that haven't tested I_LOCK).
+ * This is special! We do not need the spinlock when clearing I_LOCK,
+ * because we're guaranteed that nobody else tries to do anything about
+ * the state of the inode when it is locked, as we just created it (so
+ * there can be no old holders that haven't tested I_LOCK).
+ * However we must emit the memory barrier so that other CPUs reliably
+ * see the clearing of I_LOCK after the other inode initialisation has
+ * completed.
*/
+ smp_mb();
WARN_ON((inode->i_state & (I_LOCK|I_NEW)) != (I_LOCK|I_NEW));
inode->i_state &= ~(I_LOCK|I_NEW);
wake_up_inode(inode);
diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index b55f31c..8344005 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -36,6 +36,7 @@

void nilfs_btnode_cache_init_once(struct address_space *btnc)
{
+ memset(btnc, 0, sizeof(*btnc));
INIT_RADIX_TREE(&btnc->page_tree, GFP_ATOMIC);
spin_lock_init(&btnc->tree_lock);
INIT_LIST_HEAD(&btnc->private_list);
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 59b43a0..5fd7d2b 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -361,7 +361,13 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
/* don't dump ioremap'd stuff! (TA) */
if (m->flags & VM_IOREMAP)
continue;
- memcpy(elf_buf + (vmstart - start),
+ /*
+ * we may access memory holes, then use
+ * ex_table. checking return value just for
+ * avoid warnings.
+ */
+ vmsize = __copy_from_user_inatomic(
+ elf_buf + (vmstart - start),
(char *)vmstart, vmsize);
}
read_unlock(&vmlist_lock);
diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c
index 0c10a0b..766b1d4 100644
--- a/fs/proc/uptime.c
+++ b/fs/proc/uptime.c
@@ -4,13 +4,18 @@
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/time.h>
+#include <linux/kernel_stat.h>
#include <asm/cputime.h>

static int uptime_proc_show(struct seq_file *m, void *v)
{
struct timespec uptime;
struct timespec idle;
- cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
+ int i;
+ cputime_t idletime = cputime_zero;
+
+ for_each_possible_cpu(i)
+ idletime = cputime64_add(idletime, kstat_cpu(i).cpustat.idle);

do_posix_clock_monotonic_gettime(&uptime);
monotonic_to_bootbased(&uptime);
diff --git a/include/linux/kvm_para.h b/include/linux/kvm_para.h
index 3ddce03..d731092 100644
--- a/include/linux/kvm_para.h
+++ b/include/linux/kvm_para.h
@@ -13,6 +13,7 @@
#define KVM_ENOSYS 1000
#define KVM_EFAULT EFAULT
#define KVM_E2BIG E2BIG
+#define KVM_EPERM EPERM

#define KVM_HC_VAPIC_POLL_IRQ 1
#define KVM_HC_MMU_OP 2
diff --git a/include/pcmcia/ss.h b/include/pcmcia/ss.h
index 9b4ac93..56677eb 100644
--- a/include/pcmcia/ss.h
+++ b/include/pcmcia/ss.h
@@ -279,7 +279,7 @@ extern struct pccard_resource_ops pccard_iodyn_ops;
extern struct pccard_resource_ops pccard_nonstatic_ops;

/* socket drivers are expected to use these callbacks in their .drv struct */
-extern int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state);
+extern int pcmcia_socket_dev_suspend(struct device *dev);
extern int pcmcia_socket_dev_resume(struct device *dev);

/* socket drivers use this callback in their IRQ handler */
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 2403eb9..42f7e1a 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1017,6 +1017,7 @@ int __weak alloc_bootmem_huge_page(struct hstate *h)
NODE_DATA(h->hugetlb_next_nid),
huge_page_size(h), huge_page_size(h), 0);

+ hstate_next_node(h);
if (addr) {
/*
* Use the beginning of the huge page to store the
@@ -1026,7 +1027,6 @@ int __weak alloc_bootmem_huge_page(struct hstate *h)
m = addr;
goto found;
}
- hstate_next_node(h);
nr_nodes--;
}
return 0;
diff --git a/mm/memory.c b/mm/memory.c
index 4126dd1..445ff30 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2586,7 +2586,8 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
goto oom_free_page;

entry = mk_pte(page, vma->vm_page_prot);
- entry = maybe_mkwrite(pte_mkdirty(entry), vma);
+ if (vma->vm_flags & VM_WRITE)
+ entry = pte_mkwrite(pte_mkdirty(entry));

page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
if (!pte_none(*page_table))
diff --git a/mm/mmap.c b/mm/mmap.c
index 2b43fa1..2429a7b 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -572,9 +572,9 @@ again: remove_next = 1 + (end > next->vm_end);

/*
* When changing only vma->vm_end, we don't really need
- * anon_vma lock: but is that case worth optimizing out?
+ * anon_vma lock.
*/
- if (vma->anon_vma)
+ if (vma->anon_vma && (insert || importer || start != vma->vm_start))
anon_vma = vma->anon_vma;
if (anon_vma) {
spin_lock(&anon_vma->lock);
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index fd9d06f..e7af49d 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -539,7 +539,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
if (level != SOL_AX25)
return -ENOPROTOOPT;

- if (optlen < sizeof(int))
+ if (optlen < (int)sizeof(int))
return -EINVAL;

if (get_user(opt, (int __user *)optval))
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index e4a418f..9de46b4 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -357,7 +357,7 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
},
.proto = 0,
};
- struct in_device *in_dev = in_dev_get(dev);
+ struct in_device *in_dev = __in_dev_get_rcu(dev);

/* If err equals -EHOSTUNREACH the error is due to a
* martian destination or due to the fact that
diff --git a/net/bridge/netfilter/ebt_ulog.c b/net/bridge/netfilter/ebt_ulog.c
index 133eeae..ce50688 100644
--- a/net/bridge/netfilter/ebt_ulog.c
+++ b/net/bridge/netfilter/ebt_ulog.c
@@ -266,7 +266,7 @@ static bool ebt_ulog_tg_check(const struct xt_tgchk_param *par)
if (uloginfo->qthreshold > EBT_ULOG_MAX_QLEN)
uloginfo->qthreshold = EBT_ULOG_MAX_QLEN;

- return 0;
+ return true;
}

static struct xt_target ebt_ulog_tg_reg __read_mostly = {
diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c
index 3229e0a..b6ddd56 100644
--- a/net/ipv4/netfilter/nf_nat_core.c
+++ b/net/ipv4/netfilter/nf_nat_core.c
@@ -212,7 +212,7 @@ find_best_ips_proto(struct nf_conntrack_tuple *tuple,
maxip = ntohl(range->max_ip);
j = jhash_2words((__force u32)tuple->src.u3.ip,
range->flags & IP_NAT_RANGE_PERSISTENT ?
- (__force u32)tuple->dst.u3.ip : 0, 0);
+ 0 : (__force u32)tuple->dst.u3.ip, 0);
j = ((u64)j * (maxip - minip + 1)) >> 32;
*var_ipp = htonl(minip + j);
}
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index f546e81..854d14b 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1501,7 +1501,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
static int packet_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
- int len;
+ unsigned int len;
int val;
struct sock *sk = sock->sk;
struct packet_sock *po = pkt_sk(sk);
@@ -1514,7 +1514,7 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
if (get_user(len, optlen))
return -EFAULT;

- if (len < 0)
+ if ((int)len < 0)
return -EINVAL;

switch(optname) {
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 6654cbe..b187edc 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -539,7 +539,7 @@ static int prefix_underscores_count(const char *str)
{
const char *tail = str;

- while (*tail != '_')
+ while (*tail == '_')
tail++;

return tail - str;
--
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