---

yaml --- r: 372124 b: refs/heads/master c: b008848 h: refs/heads/master v: v3
git-mirror · Apr 3, 2013 · b756db3 · b756db3
1 parent b006571
commit b756db3
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Showing 6 changed files with 35 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4fd75911f6970478444eece952dacb2db9d1e5a5
+refs/heads/master: b00884802043d9102ecc2abfdc37a7b35b30e52a
diff --git a/trunk/arch/arm/Kconfig b/trunk/arch/arm/Kconfig
@@ -59,6 +59,7 @@ config ARM
 	select CLONE_BACKWARDS
 	select OLD_SIGSUSPEND3
 	select OLD_SIGACTION
+	select HAVE_CONTEXT_TRACKING
 	help
 	  The ARM series is a line of low-power-consumption RISC chip designs
 	  licensed by ARM Ltd and targeted at embedded applications and

diff --git a/trunk/arch/arm/include/asm/thread_info.h b/trunk/arch/arm/include/asm/thread_info.h
@@ -152,6 +152,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
 #define TIF_SYSCALL_AUDIT	9
 #define TIF_SYSCALL_TRACEPOINT	10
 #define TIF_SECCOMP		11	/* seccomp syscall filtering active */
+#define TIF_NOHZ		12	/* in adaptive nohz mode */
 #define TIF_USING_IWMMXT	17
 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
 #define TIF_RESTORE_SIGMASK	20

diff --git a/trunk/arch/arm/kernel/entry-armv.S b/trunk/arch/arm/kernel/entry-armv.S
@@ -396,6 +396,7 @@ ENDPROC(__pabt_svc)
 #ifdef CONFIG_IRQSOFF_TRACER
 	bl	trace_hardirqs_off
 #endif
+	ct_user_exit save = 0
 	.endm
 
 	.macro	kuser_cmpxchg_check

diff --git a/trunk/arch/arm/kernel/entry-common.S b/trunk/arch/arm/kernel/entry-common.S
@@ -41,6 +41,7 @@ ret_fast_syscall:
 
 	/* perform architecture specific actions before user return */
 	arch_ret_to_user r1, lr
+	ct_user_enter
 
 	restore_user_regs fast = 1, offset = S_OFF
  UNWIND(.fnend		)
@@ -76,6 +77,7 @@ no_work_pending:
 #endif
 	/* perform architecture specific actions before user return */
 	arch_ret_to_user r1, lr
+	ct_user_enter save = 0
 
 	restore_user_regs fast = 0, offset = 0
 ENDPROC(ret_to_user_from_irq)
@@ -394,6 +396,7 @@ ENTRY(vector_swi)
 	mcr	p15, 0, ip, c1, c0		@ update control register
 #endif
 	enable_irq
+	ct_user_exit
 
 	get_thread_info tsk
 	adr	tbl, sys_call_table		@ load syscall table pointer

diff --git a/trunk/arch/arm/kernel/entry-header.S b/trunk/arch/arm/kernel/entry-header.S
@@ -163,6 +163,34 @@
 	.endm
 #endif	/* !CONFIG_THUMB2_KERNEL */
 
+/*
+ * Context tracking subsystem.  Used to instrument transitions
+ * between user and kernel mode.
+ */
+	.macro ct_user_exit, save = 1
+#ifdef CONFIG_CONTEXT_TRACKING
+	.if	\save
+	stmdb   sp!, {r0-r3, ip, lr}
+	bl	user_exit
+	ldmia	sp!, {r0-r3, ip, lr}
+	.else
+	bl	user_exit
+	.endif
+#endif
+	.endm
+
+	.macro ct_user_enter, save = 1
+#ifdef CONFIG_CONTEXT_TRACKING
+	.if	\save
+	stmdb   sp!, {r0-r3, ip, lr}
+	bl	user_enter
+	ldmia	sp!, {r0-r3, ip, lr}
+	.else
+	bl	user_enter
+	.endif
+#endif
+	.endm
+
 /*
  * These are the registers used in the syscall handler, and allow us to
  * have in theory up to 7 arguments to a function - r0 to r6.