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Message-Id: <20120702125329.08d76279.akpm@linux-foundation.org>
Date: Mon, 2 Jul 2012 12:53:29 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>,
ShuoX Liu <shuox.liu@...el.com>, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: Build failures in -next due to move of disable
On Mon, 2 Jul 2012 21:54:35 +0200
"Rafael J. Wysocki" <rjw@...k.pl> wrote:
> On Monday, July 02, 2012, Mark Brown wrote:
> > Today's -next is failing to build for me because commit 9f419c (PM /
> > Domains: Add preliminary support for cpuidle) and commit b32e30
> > (cpuidle: move field disable from per-driver to per-cpu) disagree about
> > where the disable field should be:
>
> Hmm, do you know what tree commit b32e30 comes from?
From: ShuoX Liu <shuox.liu@...el.com>
Subject: cpuidle: move field disable from per-driver to per-cpu
Andrew J.Schorr raises a question. When he changes the disable setting on
a single CPU, it affects all the other CPUs. Basically, currently, the
disable field is per-driver instead of per-cpu. All the C states of the
same driver are shared by all CPU in the same machine.
The patch changes the `disable' field to per-cpu, so we could set this
separately for each cpu.
Signed-off-by: ShuoX Liu <shuox.liu@...el.com>
Reported-by: Andrew J.Schorr <aschorr@...emetry-investments.com>
Reviewed-by: Yanmin Zhang <yanmin_zhang@...el.com>
Cc: Len Brown <lenb@...nel.org>
Cc: "Brown, Len" <len.brown@...el.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
drivers/cpuidle/cpuidle.c | 1 -
drivers/cpuidle/governors/menu.c | 5 +++--
drivers/cpuidle/sysfs.c | 21 ++++++++++++---------
include/linux/cpuidle.h | 2 +-
4 files changed, 16 insertions(+), 13 deletions(-)
diff -puN drivers/cpuidle/cpuidle.c~cpuidle-move-field-disable-from-per-driver-to-per-cpu drivers/cpuidle/cpuidle.c
--- a/drivers/cpuidle/cpuidle.c~cpuidle-move-field-disable-from-per-driver-to-per-cpu
+++ a/drivers/cpuidle/cpuidle.c
@@ -276,7 +276,6 @@ static void poll_idle_init(struct cpuidl
state->power_usage = -1;
state->flags = 0;
state->enter = poll_idle;
- state->disable = 0;
}
#else
static void poll_idle_init(struct cpuidle_driver *drv) {}
diff -puN drivers/cpuidle/governors/menu.c~cpuidle-move-field-disable-from-per-driver-to-per-cpu drivers/cpuidle/governors/menu.c
--- a/drivers/cpuidle/governors/menu.c~cpuidle-move-field-disable-from-per-driver-to-per-cpu
+++ a/drivers/cpuidle/governors/menu.c
@@ -281,7 +281,7 @@ static int menu_select(struct cpuidle_dr
* unless the timer is happening really really soon.
*/
if (data->expected_us > 5 &&
- drv->states[CPUIDLE_DRIVER_STATE_START].disable == 0)
+ dev->states_usage[CPUIDLE_DRIVER_STATE_START].disable == 0)
data->last_state_idx = CPUIDLE_DRIVER_STATE_START;
/*
@@ -290,8 +290,9 @@ static int menu_select(struct cpuidle_dr
*/
for (i = CPUIDLE_DRIVER_STATE_START; i < drv->state_count; i++) {
struct cpuidle_state *s = &drv->states[i];
+ struct cpuidle_state_usage *su = &dev->states_usage[i];
- if (s->disable)
+ if (su->disable)
continue;
if (s->target_residency > data->predicted_us)
continue;
diff -puN drivers/cpuidle/sysfs.c~cpuidle-move-field-disable-from-per-driver-to-per-cpu drivers/cpuidle/sysfs.c
--- a/drivers/cpuidle/sysfs.c~cpuidle-move-field-disable-from-per-driver-to-per-cpu
+++ a/drivers/cpuidle/sysfs.c
@@ -217,7 +217,8 @@ struct cpuidle_state_attr {
struct attribute attr;
ssize_t (*show)(struct cpuidle_state *, \
struct cpuidle_state_usage *, char *);
- ssize_t (*store)(struct cpuidle_state *, const char *, size_t);
+ ssize_t (*store)(struct cpuidle_state *, \
+ struct cpuidle_state_usage *, const char *, size_t);
};
#define define_one_state_ro(_name, show) \
@@ -233,21 +234,22 @@ static ssize_t show_state_##_name(struct
return sprintf(buf, "%u\n", state->_name);\
}
-#define define_store_state_function(_name) \
+#define define_store_state_ull_function(_name) \
static ssize_t store_state_##_name(struct cpuidle_state *state, \
+ struct cpuidle_state_usage *state_usage, \
const char *buf, size_t size) \
{ \
- long value; \
+ unsigned long long value; \
int err; \
if (!capable(CAP_SYS_ADMIN)) \
return -EPERM; \
- err = kstrtol(buf, 0, &value); \
+ err = kstrtoull(buf, 0, &value); \
if (err) \
return err; \
if (value) \
- state->disable = 1; \
+ state_usage->_name = 1; \
else \
- state->disable = 0; \
+ state_usage->_name = 0; \
return size; \
}
@@ -273,8 +275,8 @@ define_show_state_ull_function(usage)
define_show_state_ull_function(time)
define_show_state_str_function(name)
define_show_state_str_function(desc)
-define_show_state_function(disable)
-define_store_state_function(disable)
+define_show_state_ull_function(disable)
+define_store_state_ull_function(disable)
define_one_state_ro(name, show_state_name);
define_one_state_ro(desc, show_state_desc);
@@ -318,10 +320,11 @@ static ssize_t cpuidle_state_store(struc
{
int ret = -EIO;
struct cpuidle_state *state = kobj_to_state(kobj);
+ struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);
if (cattr->store)
- ret = cattr->store(state, buf, size);
+ ret = cattr->store(state, state_usage, buf, size);
return ret;
}
diff -puN include/linux/cpuidle.h~cpuidle-move-field-disable-from-per-driver-to-per-cpu include/linux/cpuidle.h
--- a/include/linux/cpuidle.h~cpuidle-move-field-disable-from-per-driver-to-per-cpu
+++ a/include/linux/cpuidle.h
@@ -34,6 +34,7 @@ struct cpuidle_driver;
struct cpuidle_state_usage {
void *driver_data;
+ unsigned long long disable;
unsigned long long usage;
unsigned long long time; /* in US */
};
@@ -46,7 +47,6 @@ struct cpuidle_state {
unsigned int exit_latency; /* in US */
int power_usage; /* in mW */
unsigned int target_residency; /* in US */
- unsigned int disable;
int (*enter) (struct cpuidle_device *dev,
struct cpuidle_driver *drv,
_
--
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