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authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 07:43:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 07:43:28 -0700
commit16fa94b532b1958f508e07eca1a9256351241fbc (patch)
tree90012a7b7fe2b8cf96f6f5ec12490e0c5e152291 /arch/x86
parente0972916e8fe943f342b0dd1c9d43dbf5bc261c2 (diff)
parent25f55d9d01ad7a7ad248fd5af1d22675ffd202c5 (diff)
downloadlinux-16fa94b532b1958f508e07eca1a9256351241fbc.tar.gz
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler changes from Ingo Molnar: "The main changes in this development cycle were: - full dynticks preparatory work by Frederic Weisbecker - factor out the cpu time accounting code better, by Li Zefan - multi-CPU load balancer cleanups and improvements by Joonsoo Kim - various smaller fixes and cleanups" * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (45 commits) sched: Fix init NOHZ_IDLE flag sched: Prevent to re-select dst-cpu in load_balance() sched: Rename load_balance_tmpmask to load_balance_mask sched: Move up affinity check to mitigate useless redoing overhead sched: Don't consider other cpus in our group in case of NEWLY_IDLE sched: Explicitly cpu_idle_type checking in rebalance_domains() sched: Change position of resched_cpu() in load_balance() sched: Fix wrong rq's runnable_avg update with rt tasks sched: Document task_struct::personality field sched/cpuacct/UML: Fix header file dependency bug on the UML build cgroup: Kill subsys.active flag sched/cpuacct: No need to check subsys active state sched/cpuacct: Initialize cpuacct subsystem earlier sched/cpuacct: Initialize root cpuacct earlier sched/cpuacct: Allocate per_cpu cpuusage for root cpuacct statically sched/cpuacct: Clean up cpuacct.h sched/cpuacct: Remove redundant NULL checks in cpuacct_acount_field() sched/cpuacct: Remove redundant NULL checks in cpuacct_charge() sched/cpuacct: Add cpuacct_acount_field() sched/cpuacct: Add cpuacct_init() ...
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/context_tracking.h21
-rw-r--r--arch/x86/kernel/kvm.c8
-rw-r--r--arch/x86/kernel/traps.c68
-rw-r--r--arch/x86/mm/fault.c8
4 files changed, 52 insertions, 53 deletions
diff --git a/arch/x86/include/asm/context_tracking.h b/arch/x86/include/asm/context_tracking.h
index 1616562683e..1fe49704b14 100644
--- a/arch/x86/include/asm/context_tracking.h
+++ b/arch/x86/include/asm/context_tracking.h
@@ -1,31 +1,10 @@
#ifndef _ASM_X86_CONTEXT_TRACKING_H
#define _ASM_X86_CONTEXT_TRACKING_H
-#ifndef __ASSEMBLY__
-#include <linux/context_tracking.h>
-#include <asm/ptrace.h>
-
-static inline void exception_enter(struct pt_regs *regs)
-{
- user_exit();
-}
-
-static inline void exception_exit(struct pt_regs *regs)
-{
-#ifdef CONFIG_CONTEXT_TRACKING
- if (user_mode(regs))
- user_enter();
-#endif
-}
-
-#else /* __ASSEMBLY__ */
-
#ifdef CONFIG_CONTEXT_TRACKING
# define SCHEDULE_USER call schedule_user
#else
# define SCHEDULE_USER call schedule
#endif
-#endif /* !__ASSEMBLY__ */
-
#endif
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index b686a904d7c..cd6d9a5a42f 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -20,6 +20,7 @@
* Authors: Anthony Liguori <aliguori@us.ibm.com>
*/
+#include <linux/context_tracking.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kvm_para.h>
@@ -43,7 +44,6 @@
#include <asm/apicdef.h>
#include <asm/hypervisor.h>
#include <asm/kvm_guest.h>
-#include <asm/context_tracking.h>
static int kvmapf = 1;
@@ -254,16 +254,18 @@ EXPORT_SYMBOL_GPL(kvm_read_and_reset_pf_reason);
dotraplinkage void __kprobes
do_async_page_fault(struct pt_regs *regs, unsigned long error_code)
{
+ enum ctx_state prev_state;
+
switch (kvm_read_and_reset_pf_reason()) {
default:
do_page_fault(regs, error_code);
break;
case KVM_PV_REASON_PAGE_NOT_PRESENT:
/* page is swapped out by the host. */
- exception_enter(regs);
+ prev_state = exception_enter();
exit_idle();
kvm_async_pf_task_wait((u32)read_cr2());
- exception_exit(regs);
+ exception_exit(prev_state);
break;
case KVM_PV_REASON_PAGE_READY:
rcu_irq_enter();
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 68bda7a8415..ff6d2271cbe 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -12,6 +12,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/context_tracking.h>
#include <linux/interrupt.h>
#include <linux/kallsyms.h>
#include <linux/spinlock.h>
@@ -55,8 +56,6 @@
#include <asm/i387.h>
#include <asm/fpu-internal.h>
#include <asm/mce.h>
-#include <asm/context_tracking.h>
-
#include <asm/mach_traps.h>
#ifdef CONFIG_X86_64
@@ -176,34 +175,38 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
#define DO_ERROR(trapnr, signr, str, name) \
dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
{ \
- exception_enter(regs); \
+ enum ctx_state prev_state; \
+ \
+ prev_state = exception_enter(); \
if (notify_die(DIE_TRAP, str, regs, error_code, \
trapnr, signr) == NOTIFY_STOP) { \
- exception_exit(regs); \
+ exception_exit(prev_state); \
return; \
} \
conditional_sti(regs); \
do_trap(trapnr, signr, str, regs, error_code, NULL); \
- exception_exit(regs); \
+ exception_exit(prev_state); \
}
#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
{ \
siginfo_t info; \
+ enum ctx_state prev_state; \
+ \
info.si_signo = signr; \
info.si_errno = 0; \
info.si_code = sicode; \
info.si_addr = (void __user *)siaddr; \
- exception_enter(regs); \
+ prev_state = exception_enter(); \
if (notify_die(DIE_TRAP, str, regs, error_code, \
trapnr, signr) == NOTIFY_STOP) { \
- exception_exit(regs); \
+ exception_exit(prev_state); \
return; \
} \
conditional_sti(regs); \
do_trap(trapnr, signr, str, regs, error_code, &info); \
- exception_exit(regs); \
+ exception_exit(prev_state); \
}
DO_ERROR_INFO(X86_TRAP_DE, SIGFPE, "divide error", divide_error, FPE_INTDIV,
@@ -226,14 +229,16 @@ DO_ERROR_INFO(X86_TRAP_AC, SIGBUS, "alignment check", alignment_check,
/* Runs on IST stack */
dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code)
{
- exception_enter(regs);
+ enum ctx_state prev_state;
+
+ prev_state = exception_enter();
if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
X86_TRAP_SS, SIGBUS) != NOTIFY_STOP) {
preempt_conditional_sti(regs);
do_trap(X86_TRAP_SS, SIGBUS, "stack segment", regs, error_code, NULL);
preempt_conditional_cli(regs);
}
- exception_exit(regs);
+ exception_exit(prev_state);
}
dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code)
@@ -241,7 +246,7 @@ dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code)
static const char str[] = "double fault";
struct task_struct *tsk = current;
- exception_enter(regs);
+ exception_enter();
/* Return not checked because double check cannot be ignored */
notify_die(DIE_TRAP, str, regs, error_code, X86_TRAP_DF, SIGSEGV);
@@ -261,8 +266,9 @@ dotraplinkage void __kprobes
do_general_protection(struct pt_regs *regs, long error_code)
{
struct task_struct *tsk;
+ enum ctx_state prev_state;
- exception_enter(regs);
+ prev_state = exception_enter();
conditional_sti(regs);
#ifdef CONFIG_X86_32
@@ -300,12 +306,14 @@ do_general_protection(struct pt_regs *regs, long error_code)
force_sig(SIGSEGV, tsk);
exit:
- exception_exit(regs);
+ exception_exit(prev_state);
}
/* May run on IST stack. */
dotraplinkage void __kprobes notrace do_int3(struct pt_regs *regs, long error_code)
{
+ enum ctx_state prev_state;
+
#ifdef CONFIG_DYNAMIC_FTRACE
/*
* ftrace must be first, everything else may cause a recursive crash.
@@ -315,7 +323,7 @@ dotraplinkage void __kprobes notrace do_int3(struct pt_regs *regs, long error_co
ftrace_int3_handler(regs))
return;
#endif
- exception_enter(regs);
+ prev_state = exception_enter();
#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
if (kgdb_ll_trap(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP,
SIGTRAP) == NOTIFY_STOP)
@@ -336,7 +344,7 @@ dotraplinkage void __kprobes notrace do_int3(struct pt_regs *regs, long error_co
preempt_conditional_cli(regs);
debug_stack_usage_dec();
exit:
- exception_exit(regs);
+ exception_exit(prev_state);
}
#ifdef CONFIG_X86_64
@@ -393,11 +401,12 @@ asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
{
struct task_struct *tsk = current;
+ enum ctx_state prev_state;
int user_icebp = 0;
unsigned long dr6;
int si_code;
- exception_enter(regs);
+ prev_state = exception_enter();
get_debugreg(dr6, 6);
@@ -467,7 +476,7 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
debug_stack_usage_dec();
exit:
- exception_exit(regs);
+ exception_exit(prev_state);
}
/*
@@ -561,17 +570,21 @@ void math_error(struct pt_regs *regs, int error_code, int trapnr)
dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code)
{
- exception_enter(regs);
+ enum ctx_state prev_state;
+
+ prev_state = exception_enter();
math_error(regs, error_code, X86_TRAP_MF);
- exception_exit(regs);
+ exception_exit(prev_state);
}
dotraplinkage void
do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
{
- exception_enter(regs);
+ enum ctx_state prev_state;
+
+ prev_state = exception_enter();
math_error(regs, error_code, X86_TRAP_XF);
- exception_exit(regs);
+ exception_exit(prev_state);
}
dotraplinkage void
@@ -639,7 +652,9 @@ EXPORT_SYMBOL_GPL(math_state_restore);
dotraplinkage void __kprobes
do_device_not_available(struct pt_regs *regs, long error_code)
{
- exception_enter(regs);
+ enum ctx_state prev_state;
+
+ prev_state = exception_enter();
BUG_ON(use_eager_fpu());
#ifdef CONFIG_MATH_EMULATION
@@ -650,7 +665,7 @@ do_device_not_available(struct pt_regs *regs, long error_code)
info.regs = regs;
math_emulate(&info);
- exception_exit(regs);
+ exception_exit(prev_state);
return;
}
#endif
@@ -658,15 +673,16 @@ do_device_not_available(struct pt_regs *regs, long error_code)
#ifdef CONFIG_X86_32
conditional_sti(regs);
#endif
- exception_exit(regs);
+ exception_exit(prev_state);
}
#ifdef CONFIG_X86_32
dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
{
siginfo_t info;
+ enum ctx_state prev_state;
- exception_enter(regs);
+ prev_state = exception_enter();
local_irq_enable();
info.si_signo = SIGILL;
@@ -678,7 +694,7 @@ dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
do_trap(X86_TRAP_IRET, SIGILL, "iret exception", regs, error_code,
&info);
}
- exception_exit(regs);
+ exception_exit(prev_state);
}
#endif
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 0e883364abb..022a9a0a3c6 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -13,12 +13,12 @@
#include <linux/perf_event.h> /* perf_sw_event */
#include <linux/hugetlb.h> /* hstate_index_to_shift */
#include <linux/prefetch.h> /* prefetchw */
+#include <linux/context_tracking.h> /* exception_enter(), ... */
#include <asm/traps.h> /* dotraplinkage, ... */
#include <asm/pgalloc.h> /* pgd_*(), ... */
#include <asm/kmemcheck.h> /* kmemcheck_*(), ... */
#include <asm/fixmap.h> /* VSYSCALL_START */
-#include <asm/context_tracking.h> /* exception_enter(), ... */
/*
* Page fault error code bits:
@@ -1224,7 +1224,9 @@ good_area:
dotraplinkage void __kprobes
do_page_fault(struct pt_regs *regs, unsigned long error_code)
{
- exception_enter(regs);
+ enum ctx_state prev_state;
+
+ prev_state = exception_enter();
__do_page_fault(regs, error_code);
- exception_exit(regs);
+ exception_exit(prev_state);
}