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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-06-27 21:01:09 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-06-27 21:01:09 -0300
commitb907a8622e39eecfc4b243f3be3ad26559d1faee (patch)
treeb99ead386fccde5ea8252b5b5ebff8ffd83cd03d /arch/x86
parent68f052d01b53b858897d80beb0095920abe5868e (diff)
Linux-libre 4.6.3-gnupck-4.6.3-gnu
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/early_printk.c6
-rw-r--r--arch/x86/kernel/traps.c20
-rw-r--r--arch/x86/kvm/x86.c5
-rw-r--r--arch/x86/platform/efi/early_printk.c3
4 files changed, 18 insertions, 16 deletions
diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
index 88d0ae205..8a121991e 100644
--- a/arch/x86/kernel/early_printk.c
+++ b/arch/x86/kernel/early_printk.c
@@ -27,8 +27,7 @@
static int max_ypos = 25, max_xpos = 80;
static int current_ypos = 25, current_xpos;
-static void early_vga_write(struct console *con, const char *str, unsigned n,
- unsigned int loglevel)
+static void early_vga_write(struct console *con, const char *str, unsigned n)
{
char c;
int i, k, j;
@@ -119,8 +118,7 @@ static int early_serial_putc(unsigned char ch)
return timeout ? 0 : -1;
}
-static void early_serial_write(struct console *con, const char *s, unsigned n,
- unsigned int loglevel)
+static void early_serial_write(struct console *con, const char *s, unsigned n)
{
while (*s && n-- > 0) {
if (*s == '\n')
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 06cbe2586..87bd6b6bf 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -95,6 +95,12 @@ static inline void cond_local_irq_disable(struct pt_regs *regs)
local_irq_disable();
}
+/*
+ * In IST context, we explicitly disable preemption. This serves two
+ * purposes: it makes it much less likely that we would accidentally
+ * schedule in IST context and it will force a warning if we somehow
+ * manage to schedule by accident.
+ */
void ist_enter(struct pt_regs *regs)
{
if (user_mode(regs)) {
@@ -109,13 +115,7 @@ void ist_enter(struct pt_regs *regs)
rcu_nmi_enter();
}
- /*
- * We are atomic because we're on the IST stack; or we're on
- * x86_32, in which case we still shouldn't schedule; or we're
- * on x86_64 and entered from user mode, in which case we're
- * still atomic unless ist_begin_non_atomic is called.
- */
- preempt_count_add(HARDIRQ_OFFSET);
+ preempt_disable();
/* This code is a bit fragile. Test it. */
RCU_LOCKDEP_WARN(!rcu_is_watching(), "ist_enter didn't work");
@@ -123,7 +123,7 @@ void ist_enter(struct pt_regs *regs)
void ist_exit(struct pt_regs *regs)
{
- preempt_count_sub(HARDIRQ_OFFSET);
+ preempt_enable_no_resched();
if (!user_mode(regs))
rcu_nmi_exit();
@@ -154,7 +154,7 @@ void ist_begin_non_atomic(struct pt_regs *regs)
BUG_ON((unsigned long)(current_top_of_stack() -
current_stack_pointer()) >= THREAD_SIZE);
- preempt_count_sub(HARDIRQ_OFFSET);
+ preempt_enable_no_resched();
}
/**
@@ -164,7 +164,7 @@ void ist_begin_non_atomic(struct pt_regs *regs)
*/
void ist_end_non_atomic(void)
{
- preempt_count_add(HARDIRQ_OFFSET);
+ preempt_disable();
}
static nokprobe_inline int
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9b7798c7b..6b9701bab 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3032,6 +3032,11 @@ static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
if (dbgregs->flags)
return -EINVAL;
+ if (dbgregs->dr6 & ~0xffffffffull)
+ return -EINVAL;
+ if (dbgregs->dr7 & ~0xffffffffull)
+ return -EINVAL;
+
memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
kvm_update_dr0123(vcpu);
vcpu->arch.dr6 = dbgregs->dr6;
diff --git a/arch/x86/platform/efi/early_printk.c b/arch/x86/platform/efi/early_printk.c
index 5eb772c0d..524142117 100644
--- a/arch/x86/platform/efi/early_printk.c
+++ b/arch/x86/platform/efi/early_printk.c
@@ -124,8 +124,7 @@ static void early_efi_write_char(u32 *dst, unsigned char c, unsigned int h)
}
static void
-early_efi_write(struct console *con, const char *str, unsigned int num,
- unsigned int loglevel)
+early_efi_write(struct console *con, const char *str, unsigned int num)
{
struct screen_info *si;
unsigned int len;