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Commit 8e63dd6e authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc: Fix unpaired __trace_hcall_entry and __trace_hcall_exit
  powerpc: Fix RCU idle and hcall tracing
parents f88609a0 ebb7f616

arch/powerpc/kernel/idle.c

+2 −10
Original line number Diff line number Diff line
@@ -50,12 +50,6 @@ static int __init powersave_off(char *arg) 
}

__setup("powersave=off", powersave_off);



#if defined(CONFIG_PPC_PSERIES) && defined(CONFIG_TRACEPOINTS)

static const bool idle_uses_rcu = 1;

#else

static const bool idle_uses_rcu;

#endif



/*

 * The body of the idle task.

 */
@@ -67,7 +61,6 @@ void cpu_idle(void) 
	set_thread_flag(TIF_POLLING_NRFLAG);

	while (1) {

		tick_nohz_idle_enter();

		if (!idle_uses_rcu)

		rcu_idle_enter();



		while (!need_resched() && !cpu_should_die()) {
@@ -106,7 +99,6 @@ void cpu_idle(void) 


		HMT_medium();

		ppc64_runlatch_on();

		if (!idle_uses_rcu)

		rcu_idle_exit();

		tick_nohz_idle_exit();

		preempt_enable_no_resched();

arch/powerpc/platforms/pseries/hvCall.S

+2 −1
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ BEGIN_FTR_SECTION; \ 
	b	1f;						\

END_FTR_SECTION(0, 1);						\

	ld      r12,hcall_tracepoint_refcount@toc(r2);		\

	std	r12,32(r1);					\

	cmpdi	r12,0;						\

	beq+	1f;						\

	mflr	r0;						\
@@ -74,7 +75,7 @@ END_FTR_SECTION(0, 1); \ 
BEGIN_FTR_SECTION;						\

	b	1f;						\

END_FTR_SECTION(0, 1);						\

	ld      r12,hcall_tracepoint_refcount@toc(r2);		\

	ld      r12,32(r1);					\

	cmpdi	r12,0;						\

	beq+	1f;						\

	mflr	r0;						\

arch/powerpc/platforms/pseries/lpar.c

+10 −4
Original line number Diff line number Diff line
@@ -546,6 +546,13 @@ void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 
	unsigned long flags;

	unsigned int *depth;



	/*

	 * We cannot call tracepoints inside RCU idle regions which

	 * means we must not trace H_CEDE.

	 */

	if (opcode == H_CEDE)

		return;



	local_irq_save(flags);



	depth = &__get_cpu_var(hcall_trace_depth);
@@ -556,8 +563,6 @@ void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 
	(*depth)++;

	preempt_disable();

	trace_hcall_entry(opcode, args);

	if (opcode == H_CEDE)

		rcu_idle_enter();

	(*depth)--;



out:
@@ -570,6 +575,9 @@ void __trace_hcall_exit(long opcode, unsigned long retval, 
	unsigned long flags;

	unsigned int *depth;



	if (opcode == H_CEDE)

		return;



	local_irq_save(flags);



	depth = &__get_cpu_var(hcall_trace_depth);
@@ -578,8 +586,6 @@ void __trace_hcall_exit(long opcode, unsigned long retval, 
		goto out;



	(*depth)++;

	if (opcode == H_CEDE)

		rcu_idle_exit();

	trace_hcall_exit(opcode, retval, retbuf);

	preempt_enable();

	(*depth)--;