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Date: Fri, 1 Mar 2013 17:08:55 +0100
From: Frederic Weisbecker <fweisbec@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>,
Li Zhong <zhong@...ux.vnet.ibm.com>,
Kevin Hilman <khilman@...aro.org>,
Mats Liljegren <mats.liljegren@...a.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Namhyung Kim <namhyung.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 1/5] context_tracking: Move exception handling to generic code
Exceptions handling on context tracking should share common
treatment: on entry we exit user mode if the exception triggered
in that context. Then on exception exit we return to that previous
context.
Generalize this to avoid duplication across archs.
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Li Zhong <zhong@...ux.vnet.ibm.com>
Cc: Kevin Hilman <khilman@...aro.org>
Cc: Mats Liljegren <mats.liljegren@...a.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Namhyung Kim <namhyung.kim@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
---
arch/x86/include/asm/context_tracking.h | 21 ---------------------
arch/x86/kernel/kvm.c | 2 +-
arch/x86/kernel/traps.c | 3 +--
arch/x86/mm/fault.c | 2 +-
include/linux/context_tracking.h | 17 ++++++++++++++++-
5 files changed, 19 insertions(+), 26 deletions(-)
diff --git a/arch/x86/include/asm/context_tracking.h b/arch/x86/include/asm/context_tracking.h
index 1616562..1fe4970 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 2b44ea5..1effefa 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -20,6 +20,7 @@
* Authors: Anthony Liguori <aliguori@...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;
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index ecffca1..be079a6 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
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index fb674fd..6d1e11f 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:
diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index b28d161..5a69273 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -1,10 +1,11 @@
#ifndef _LINUX_CONTEXT_TRACKING_H
#define _LINUX_CONTEXT_TRACKING_H
-#ifdef CONFIG_CONTEXT_TRACKING
#include <linux/sched.h>
#include <linux/percpu.h>
+#include <asm/ptrace.h>
+#ifdef CONFIG_CONTEXT_TRACKING
struct context_tracking {
/*
* When active is false, probes are unset in order
@@ -33,12 +34,26 @@ static inline bool context_tracking_active(void)
extern void user_enter(void);
extern void user_exit(void);
+
+static inline void exception_enter(struct pt_regs *regs)
+{
+ user_exit();
+}
+
+static inline void exception_exit(struct pt_regs *regs)
+{
+ if (user_mode(regs))
+ user_enter();
+}
+
extern void context_tracking_task_switch(struct task_struct *prev,
struct task_struct *next);
#else
static inline bool context_tracking_in_user(void) { return false; }
static inline void user_enter(void) { }
static inline void user_exit(void) { }
+static inline void exception_enter(struct pt_regs *regs) { }
+static inline void exception_exit(struct pt_regs *regs) { }
static inline void context_tracking_task_switch(struct task_struct *prev,
struct task_struct *next) { }
#endif /* !CONFIG_CONTEXT_TRACKING */
--
1.7.5.4
--
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