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Date: Fri, 6 Sep 2013 12:04:24 +0100
From: Will Deacon <will.deacon@....com>
To: Christoph Lameter <cl@...ux.com>
Cc: Tejun Heo <tj@...nel.org>,
"akpm@...uxfoundation.org" <akpm@...uxfoundation.org>,
Russell King <linux@....linux.org.uk>,
Catalin Marinas <Catalin.Marinas@....com>,
"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
Steven Rostedt <srostedt@...hat.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [gcv v3 27/35] arm: Replace __get_cpu_var uses
On Thu, Sep 05, 2013 at 06:52:19PM +0100, Christoph Lameter wrote:
> On Thu, 5 Sep 2013, Will Deacon wrote:
>
> > > Ok can you take it from here and modify it? I have no build and test
> > > environment set up for ARM.
> >
> > Sure. Does that include the original arm/arm64 patches from your v3 series
> > as well as these two fixups?
>
> I think so. Take whatever you can and I will make another pass after the
> merge and pick up anything that was missed.
Ok, I had a crack at putting something together on top of HEAD, but I still
see some errors due to pcpu array types (even with your patch in mainline).
I think some of your conversions to __this_cpu_read should use this_cpu_ptr
instead, but could you have a quick look at my fixup below please?
Will
--->8
diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c
index e7e6eca..3d44660 100644
--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -344,13 +344,13 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
/* Breakpoint */
ctrl_base = ARM_BASE_BCR;
val_base = ARM_BASE_BVR;
- slots = (struct perf_event **)__this_cpu_read(bp_on_reg);
+ slots = this_cpu_ptr(bp_on_reg);
max_slots = core_num_brps;
} else {
/* Watchpoint */
ctrl_base = ARM_BASE_WCR;
val_base = ARM_BASE_WVR;
- slots = (struct perf_event **)__this_cpu_read(wp_on_reg);
+ slots = this_cpu_ptr(wp_on_reg);
max_slots = core_num_wrps;
}
@@ -396,12 +396,12 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
if (info->ctrl.type == ARM_BREAKPOINT_EXECUTE) {
/* Breakpoint */
base = ARM_BASE_BCR;
- slots = (struct perf_event **)__this_cpu_read(bp_on_reg);
+ slots = this_cpu_ptr(bp_on_reg);
max_slots = core_num_brps;
} else {
/* Watchpoint */
base = ARM_BASE_WCR;
- slots = (struct perf_event **)__this_cpu_read(wp_on_reg);
+ slots = this_cpu_ptr(wp_on_reg);
max_slots = core_num_wrps;
}
@@ -697,7 +697,7 @@ static void watchpoint_handler(unsigned long addr, unsigned int fsr,
struct arch_hw_breakpoint *info;
struct arch_hw_breakpoint_ctrl ctrl;
- slots = (struct perf_event **)__this_cpu_read(wp_on_reg);
+ slots = this_cpu_ptr(wp_on_reg);
for (i = 0; i < core_num_wrps; ++i) {
rcu_read_lock();
@@ -768,7 +768,7 @@ static void watchpoint_single_step_handler(unsigned long pc)
struct perf_event *wp, **slots;
struct arch_hw_breakpoint *info;
- slots = (struct perf_event **)__this_cpu_read(wp_on_reg);
+ slots = this_cpu_ptr(wp_on_reg);
for (i = 0; i < core_num_wrps; ++i) {
rcu_read_lock();
@@ -802,7 +802,7 @@ static void breakpoint_handler(unsigned long unknown, struct pt_regs *regs)
struct arch_hw_breakpoint *info;
struct arch_hw_breakpoint_ctrl ctrl;
- slots = (struct perf_event **)__this_cpu_read(bp_on_reg);
+ slots = this_cpu_ptr(bp_on_reg);
/* The exception entry code places the amended lr in the PC. */
addr = regs->ARM_pc;
diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c
index 53dc018..ff516f6 100644
--- a/arch/arm64/kernel/hw_breakpoint.c
+++ b/arch/arm64/kernel/hw_breakpoint.c
@@ -184,14 +184,14 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
/* Breakpoint */
ctrl_reg = AARCH64_DBG_REG_BCR;
val_reg = AARCH64_DBG_REG_BVR;
- slots = __this_cpu_read(bp_on_reg);
+ slots = this_cpu_ptr(bp_on_reg);
max_slots = core_num_brps;
reg_enable = !debug_info->bps_disabled;
} else {
/* Watchpoint */
ctrl_reg = AARCH64_DBG_REG_WCR;
val_reg = AARCH64_DBG_REG_WVR;
- slots = __this_cpu_read(wp_on_reg);
+ slots = this_cpu_ptr(wp_on_reg);
max_slots = core_num_wrps;
reg_enable = !debug_info->wps_disabled;
}
@@ -230,12 +230,12 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
if (info->ctrl.type == ARM_BREAKPOINT_EXECUTE) {
/* Breakpoint */
base = AARCH64_DBG_REG_BCR;
- slots = __this_cpu_read(bp_on_reg);
+ slots = this_cpu_ptr(bp_on_reg);
max_slots = core_num_brps;
} else {
/* Watchpoint */
base = AARCH64_DBG_REG_WCR;
- slots = __this_cpu_read(wp_on_reg);
+ slots = this_cpu_ptr(wp_on_reg);
max_slots = core_num_wrps;
}
@@ -505,11 +505,11 @@ static void toggle_bp_registers(int reg, enum debug_el el, int enable)
switch (reg) {
case AARCH64_DBG_REG_BCR:
- slots = __this_cpu_read(bp_on_reg);
+ slots = this_cpu_ptr(bp_on_reg);
max_slots = core_num_brps;
break;
case AARCH64_DBG_REG_WCR:
- slots = __this_cpu_read(wp_on_reg);
+ slots = this_cpu_ptr(wp_on_reg);
max_slots = core_num_wrps;
break;
default:
@@ -546,7 +546,7 @@ static int breakpoint_handler(unsigned long unused, unsigned int esr,
struct debug_info *debug_info;
struct arch_hw_breakpoint_ctrl ctrl;
- slots = (struct perf_event **)__this_cpu_read(bp_on_reg);
+ slots = this_cpu_ptr(bp_on_reg);
addr = instruction_pointer(regs);
debug_info = ¤t->thread.debug;
@@ -623,7 +623,7 @@ static int watchpoint_handler(unsigned long addr, unsigned int esr,
struct arch_hw_breakpoint *info;
struct arch_hw_breakpoint_ctrl ctrl;
- slots = (struct perf_event **)__this_cpu_read(wp_on_reg);
+ slots = this_cpu_ptr(wp_on_reg);
debug_info = ¤t->thread.debug;
for (i = 0; i < core_num_wrps; ++i) {
--
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