perf & kvm: Clean up some of the guest profiling callback API details

Fix some build bug and programming style issues:

 - use valid C
 - fix up various style details

Signed-off-by: Zhang Yanmin <yanmin_zhang@linux.intel.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Sheng Yang <sheng@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: oerg Roedel <joro@8bytes.org>
Cc: Jes Sorensen <Jes.Sorensen@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Zachary Amsden <zamsden@redhat.com>
Cc: zhiteng.huang@intel.com
Cc: tim.c.chen@intel.com
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
LKML-Reference: <1271729638.2078.624.camel@ymzhang.sh.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 2ea78ab..7de7061 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1752,23 +1752,31 @@ void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int ski
 unsigned long perf_instruction_pointer(struct pt_regs *regs)
 {
        unsigned long ip;
+
        if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
                ip = perf_guest_cbs->get_guest_ip();
        else
                ip = instruction_pointer(regs);
+
        return ip;
 }
 
 unsigned long perf_misc_flags(struct pt_regs *regs)
 {
        int misc = 0;
+
        if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
-               misc |= perf_guest_cbs->is_user_mode() ?
-                       PERF_RECORD_MISC_GUEST_USER :
-                       PERF_RECORD_MISC_GUEST_KERNEL;
-       } else
-               misc |= user_mode(regs) ? PERF_RECORD_MISC_USER :
-                       PERF_RECORD_MISC_KERNEL;
+               if (perf_guest_cbs->is_user_mode())
+                       misc |= PERF_RECORD_MISC_GUEST_USER;
+               else
+                       misc |= PERF_RECORD_MISC_GUEST_KERNEL;
+       } else {
+               if (user_mode(regs))
+                       misc |= PERF_RECORD_MISC_USER;
+               else
+                       misc |= PERF_RECORD_MISC_KERNEL;
+       }
+
        if (regs->flags & PERF_EFLAGS_EXACT)
                misc |= PERF_RECORD_MISC_EXACT;
 

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c3a33b2..21b9b6a 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3776,16 +3776,20 @@ static int kvm_is_in_guest(void)
 static int kvm_is_user_mode(void)
 {
        int user_mode = 3;
+
        if (percpu_read(current_vcpu))
                user_mode = kvm_x86_ops->get_cpl(percpu_read(current_vcpu));
+
        return user_mode != 0;
 }
 
 static unsigned long kvm_get_guest_ip(void)
 {
        unsigned long ip = 0;
+
        if (percpu_read(current_vcpu))
                ip = kvm_rip_read(percpu_read(current_vcpu));
+
        return ip;
 }
 

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 24de5f1..ace31fb 100644 (file)
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -941,10 +941,8 @@ static inline void perf_event_mmap(struct vm_area_struct *vma)
 }
 
 extern struct perf_guest_info_callbacks *perf_guest_cbs;
-extern int perf_register_guest_info_callbacks(
-               struct perf_guest_info_callbacks *);
-extern int perf_unregister_guest_info_callbacks(
-               struct perf_guest_info_callbacks *);
+extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
+extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 
 extern void perf_event_comm(struct task_struct *tsk);
 extern void perf_event_fork(struct task_struct *tsk);
@@ -1016,9 +1014,9 @@ static inline void
 perf_bp_event(struct perf_event *event, void *data)                    { }
 
 static inline int perf_register_guest_info_callbacks
-(struct perf_guest_info_callbacks *) {return 0; }
+(struct perf_guest_info_callbacks *callbacks) { return 0; }
 static inline int perf_unregister_guest_info_callbacks
-(struct perf_guest_info_callbacks *) {return 0; }
+(struct perf_guest_info_callbacks *callbacks) { return 0; }
 
 static inline void perf_event_mmap(struct vm_area_struct *vma)         { }
 static inline void perf_event_comm(struct task_struct *tsk)            { }