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Message-ID: <20120406222329.GA19837@phenom.dumpdata.com>
Date: Fri, 6 Apr 2012 18:23:29 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: ming.m.lin@...el.com, linux-kernel@...r.kernel.org
Subject: Re: ACPI: Move module parameter gts and bfs to sleep.c
Hey Lin,
I was wondering if you are OK with exporting the wake_sleep_flags
function so that other callers of acpi_enter_sleep (which are
outside the sleep.c) could use it?
Specifically this patch
http://git.kernel.org/?p=linux/kernel/git/konrad/xen.git;a=blobdiff;f=include/xen/acpi.h;h=ebaabbbe91877cc9d7188254463b4a591f6bb81d;hp=48a9c0171b658904b33a82df0d4aa31fe8b8ed81;hb=331a7ed09457ca7b6c31170c5d59a09e6f1e02c2;hpb=68504cdd16c26735078f65a0bdc8eeb9f0c493ea
[which I was hoping to post for v3.5]
.. which in 3.3 would call acpi_enter_sleep_state without
trouble but with 3.4 it needs a parameter.
This little patch (compile tested, but not actually run):
commit 8f9f29819fa71de17e2e6f38fc50c4156dc3dada
Author: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Date: Fri Apr 6 17:53:51 2012 -0400
ACPI: Convert wake_sleep_flags to a value instead of function.
With commit a2ef5c4fd44ce3922435139393b89f2cce47f576
"ACPI: Move module parameter gts and bfs to sleep.c" the wake_sleep_flags
is required when calling acpi_enter_sleep_state, which means
that if there are functions outside the sleep.c code they
can't get get the wake_sleep_flags values.
This converts the function in to a exported value and converts
the module config operands to a function.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
diff --git a/arch/x86/kernel/acpi/sleep.h b/arch/x86/kernel/acpi/sleep.h
index 4d3feb5..f84e9cd 100644
--- a/arch/x86/kernel/acpi/sleep.h
+++ b/arch/x86/kernel/acpi/sleep.h
@@ -9,6 +9,8 @@ extern long saved_magic;
extern int wakeup_pmode_return;
+extern unsigned wake_sleep_flags;
+
extern unsigned long acpi_copy_wakeup_routine(unsigned long);
extern void wakeup_long64(void);
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 6a8d4d3..dcee73a 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -28,23 +28,23 @@
#include "internal.h"
#include "sleep.h"
+u8 wake_sleep_flags = ACPI_NO_OPTIONAL_METHODS;
static unsigned int gts, bfs;
-module_param(gts, uint, 0644);
-module_param(bfs, uint, 0644);
-MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
-MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
-
-static u8 wake_sleep_flags(void)
+static int set_param_wake_flag(const char *val, struct kernel_param *kp)
{
- u8 flags = ACPI_NO_OPTIONAL_METHODS;
+ int ret = param_set_int(val, kp);
if (gts)
- flags |= ACPI_EXECUTE_GTS;
+ wake_sleep_flags |= ACPI_EXECUTE_GTS;
if (bfs)
- flags |= ACPI_EXECUTE_BFS;
+ wake_sleep_flags |= ACPI_EXECUTE_BFS;
- return flags;
+ return ret;
}
+module_param_call(gts, set_param_wake_flag, param_get_int, >s, 0644);
+module_param_call(bfs, set_param_wake_flag, param_get_int, &bfs, 0644);
+MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
+MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
static u8 sleep_states[ACPI_S_STATE_COUNT];
@@ -263,7 +263,6 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
{
acpi_status status = AE_OK;
u32 acpi_state = acpi_target_sleep_state;
- u8 flags = wake_sleep_flags();
int error;
ACPI_FLUSH_CPU_CACHE();
@@ -271,7 +270,7 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
switch (acpi_state) {
case ACPI_STATE_S1:
barrier();
- status = acpi_enter_sleep_state(acpi_state, flags);
+ status = acpi_enter_sleep_state(acpi_state, wake_sleep_flags);
break;
case ACPI_STATE_S3:
@@ -288,7 +287,7 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
/* Reprogram control registers and execute _BFS */
- acpi_leave_sleep_state_prep(acpi_state, flags);
+ acpi_leave_sleep_state_prep(acpi_state, wake_sleep_flags);
/* ACPI 3.0 specs (P62) says that it's the responsibility
* of the OSPM to clear the status bit [ implying that the
@@ -552,30 +551,27 @@ static int acpi_hibernation_begin(void)
static int acpi_hibernation_enter(void)
{
- u8 flags = wake_sleep_flags();
acpi_status status = AE_OK;
ACPI_FLUSH_CPU_CACHE();
/* This shouldn't return. If it returns, we have a problem */
- status = acpi_enter_sleep_state(ACPI_STATE_S4, flags);
+ status = acpi_enter_sleep_state(ACPI_STATE_S4, wake_sleep_flags);
/* Reprogram control registers and execute _BFS */
- acpi_leave_sleep_state_prep(ACPI_STATE_S4, flags);
+ acpi_leave_sleep_state_prep(ACPI_STATE_S4, wake_sleep_flags);
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
static void acpi_hibernation_leave(void)
{
- u8 flags = wake_sleep_flags();
-
/*
* If ACPI is not enabled by the BIOS and the boot kernel, we need to
* enable it here.
*/
acpi_enable();
/* Reprogram control registers and execute _BFS */
- acpi_leave_sleep_state_prep(ACPI_STATE_S4, flags);
+ acpi_leave_sleep_state_prep(ACPI_STATE_S4, wake_sleep_flags);
/* Check the hardware signature */
if (facs && s4_hardware_signature != facs->hardware_signature) {
printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
@@ -830,12 +826,10 @@ static void acpi_power_off_prepare(void)
static void acpi_power_off(void)
{
- u8 flags = wake_sleep_flags();
-
/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
printk(KERN_DEBUG "%s called\n", __func__);
local_irq_disable();
- acpi_enter_sleep_state(ACPI_STATE_S5, flags);
+ acpi_enter_sleep_state(ACPI_STATE_S5, wake_sleep_flags);
}
/*
--
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