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cpufreq: use work_on_cpu in acpi-cpufreq.c for drv_read and drv_write

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Impact: use new work_on_cpu function to reduce stack usage

Replace the saving of current->cpus_allowed and set_cpus_allowed_ptr() with
a work_on_cpu function for drv_read() and drv_write().

Basically converts do_drv_{read,write} into "work_on_cpu" functions that
are now called by drv_read and drv_write.

Note: This patch basically reverts 50c668d6 which reverted 7503bfba, now
that the work_on_cpu() function is more stable.

Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Tested-by: Dieter Ries <clip2@gmx.de>
Tested-by: Maciej Rutecki <maciej.rutecki@gmail.com>
Cc: Dave Jones <davej@redhat.com>
Cc: <cpufreq@vger.kernel.org>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Travis 2009-01-16 15:31:15 -08:00 committed by Ingo Molnar
parent 8ccad40df8
commit 7285908185
1 changed files with 9 additions and 13 deletions
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22
arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
View file

@ -150,8 +150,9 @@ struct drv_cmd {
u32 val;
};
static void do_drv_read(struct drv_cmd *cmd)
static long do_drv_read(void *_cmd)
{
struct drv_cmd *cmd = _cmd;
u32 h;
switch (cmd->type) {
@ -166,10 +167,12 @@ static void do_drv_read(struct drv_cmd *cmd)
default:
break;
}
return 0;
}
static void do_drv_write(struct drv_cmd *cmd)
static long do_drv_write(void *_cmd)
{
struct drv_cmd *cmd = _cmd;
u32 lo, hi;
switch (cmd->type) {
@ -186,30 +189,23 @@ static void do_drv_write(struct drv_cmd *cmd)
default:
break;
}
return 0;
}
static void drv_read(struct drv_cmd *cmd)
{
cpumask_t saved_mask = current->cpus_allowed;
cmd->val = 0;
set_cpus_allowed_ptr(current, cmd->mask);
do_drv_read(cmd);
set_cpus_allowed_ptr(current, &saved_mask);
work_on_cpu(cpumask_any(cmd->mask), do_drv_read, cmd);
}
static void drv_write(struct drv_cmd *cmd)
{
cpumask_t saved_mask = current->cpus_allowed;
unsigned int i;
for_each_cpu(i, cmd->mask) {
set_cpus_allowed_ptr(current, cpumask_of(i));
do_drv_write(cmd);
work_on_cpu(i, do_drv_write, cmd);
}
set_cpus_allowed_ptr(current, &saved_mask);
return;
}
static u32 get_cur_val(const struct cpumask *mask)
@ -366,7 +362,7 @@ static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
return freq;
}
static unsigned int check_freqs(const cpumask_t *mask, unsigned int freq,
static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq,
struct acpi_cpufreq_data *data)
{
unsigned int cur_freq;