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Date: Mon, 13 Feb 2012 16:12:26 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc: Linux PM list <linux-pm@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH 2/3] PM / Sleep: Make enter_state() in kernel/power/suspend.c static
On Monday, February 13, 2012, Srivatsa S. Bhat wrote:
> On 02/13/2012 02:54 AM, Rafael J. Wysocki wrote:
>
> > On Sunday, February 12, 2012, Srivatsa S. Bhat wrote:
> >> On 02/12/2012 04:34 AM, Rafael J. Wysocki wrote:
> >>
> >>> From: Rafael J. Wysocki <rjw@...k.pl>
> >>>
> >>> The enter_state() function in kernel/power/suspend.c should be
> >>> static and state_store() in kernel/power/suspend.c should call
> >>> pm_suspend() instead of it, so make that happen (which also reduces
> >>> code duplication related to suspend statistics).
> >>>
> >>> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> >>> ---
> >>> kernel/power/main.c | 6 +-----
> >>> kernel/power/power.h | 2 --
> >>> kernel/power/suspend.c | 2 +-
> >>> 3 files changed, 2 insertions(+), 8 deletions(-)
> >>>
> >>> Index: linux/kernel/power/main.c
> >>> ===================================================================
> >>> --- linux.orig/kernel/power/main.c
> >>> +++ linux/kernel/power/main.c
> >>> @@ -292,11 +292,7 @@ static ssize_t state_store(struct kobjec
> >>> #ifdef CONFIG_SUSPEND
> >>> for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
> >>> if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
> >>> - break;
> >>> - }
> >>> - if (state < PM_SUSPEND_MAX && *s) {
> >>> - error = enter_state(state);
> >>> - suspend_stats_update(error);
> >>> + error = pm_suspend(state);
> >>
> >>
> >> This code will not stop after calling pm_suspend(). It will try more iterations
> >> in the for loop right?
> >
> > Well, only one string in pm_states[] can be matched at a time, but I agree that
> > it doesn't make sense to continue the loop after we've found a match.
> >
> >> We can probably keep the 'for' loop as it is, and just replace the 'if' block
> >> following the 'for' loop by: error = pm_suspend(state);
> >
> > I think the patch below is correct.
> >
> > Thanks,
> > Rafael
> >
> > ---
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > Subject: PM / Sleep: Make enter_state() in kernel/power/suspend.c static
> >
> > The enter_state() function in kernel/power/suspend.c should be
> > static and state_store() in kernel/power/suspend.c should call
> > pm_suspend() instead of it, so make that happen (which also reduces
> > code duplication related to suspend statistics).
> >
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > ---
>
>
> Yeah, this version of the patch will work fine.
>
> Acked-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Thanks!
I wonder if that should be Reviewed-by, tough? You evidently have reviewed
the patch (actually, all three of them).
Rafael
> > kernel/power/main.c | 8 +++-----
> > kernel/power/power.h | 2 --
> > kernel/power/suspend.c | 2 +-
> > 3 files changed, 4 insertions(+), 8 deletions(-)
> >
> > Index: linux/kernel/power/main.c
> > ===================================================================
> > --- linux.orig/kernel/power/main.c
> > +++ linux/kernel/power/main.c
> > @@ -291,12 +291,10 @@ static ssize_t state_store(struct kobjec
> >
> > #ifdef CONFIG_SUSPEND
> > for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
> > - if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
> > + if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) {
> > + error = pm_suspend(state);
> > break;
> > - }
> > - if (state < PM_SUSPEND_MAX && *s) {
> > - error = enter_state(state);
> > - suspend_stats_update(error);
> > + }
> > }
> > #endif
> >
> > Index: linux/kernel/power/power.h
> > ===================================================================
> > --- linux.orig/kernel/power/power.h
> > +++ linux/kernel/power/power.h
> > @@ -177,13 +177,11 @@ extern const char *const pm_states[];
> >
> > extern bool valid_state(suspend_state_t state);
> > extern int suspend_devices_and_enter(suspend_state_t state);
> > -extern int enter_state(suspend_state_t state);
> > #else /* !CONFIG_SUSPEND */
> > static inline int suspend_devices_and_enter(suspend_state_t state)
> > {
> > return -ENOSYS;
> > }
> > -static inline int enter_state(suspend_state_t state) { return -ENOSYS; }
> > static inline bool valid_state(suspend_state_t state) { return false; }
> > #endif /* !CONFIG_SUSPEND */
> >
> > Index: linux/kernel/power/suspend.c
> > ===================================================================
> > --- linux.orig/kernel/power/suspend.c
> > +++ linux/kernel/power/suspend.c
> > @@ -272,7 +272,7 @@ static void suspend_finish(void)
> > * Fail if that's not the case. Otherwise, prepare for system suspend, make the
> > * system enter the given sleep state and clean up after wakeup.
> > */
> > -int enter_state(suspend_state_t state)
> > +static int enter_state(suspend_state_t state)
> > {
> > int error;
> >
> >
>
>
>
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