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authorLinus Torvalds <torvalds@linux-foundation.org>2016-08-01 18:55:31 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-01 18:55:31 -0400
commite48af7aaf1e6d266414b11540339e6d2dac20ad2 (patch)
tree4ff43886fc31c4f37db1780f9a504c5680123100
parented780686de61ab27e65f1cfedeccd7b45667bd70 (diff)
parentfbb0e4da96f4503e65bc4fb627cf4e1d7c8c64e6 (diff)
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Merge tag 'please-pull-misc-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux
Pull ia64 updates from Tony Luck: "Miscellaneous ia64 cleanups" * tag 'please-pull-misc-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux: ia64: salinfo: use a waitqueue instead a sema down/up combo ia64: efi: use timespec64 for persistent clock
-rw-r--r--arch/ia64/kernel/efi.c4
-rw-r--r--arch/ia64/kernel/salinfo.c38
-rw-r--r--arch/ia64/kernel/time.c2
-rw-r--r--include/linux/efi.h2
4 files changed, 14 insertions, 32 deletions
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index 3b7a60e40e8a..121295637d0d 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -236,7 +236,7 @@ STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
STUB_RESET_SYSTEM(virt, id)
void
-efi_gettimeofday (struct timespec *ts)
+efi_gettimeofday (struct timespec64 *ts)
{
efi_time_t tm;
@@ -245,7 +245,7 @@ efi_gettimeofday (struct timespec *ts)
return;
}
- ts->tv_sec = mktime(tm.year, tm.month, tm.day,
+ ts->tv_sec = mktime64(tm.year, tm.month, tm.day,
tm.hour, tm.minute, tm.second);
ts->tv_nsec = tm.nanosecond;
}
diff --git a/arch/ia64/kernel/salinfo.c b/arch/ia64/kernel/salinfo.c
index 1eeffb7fbb16..5313007d5423 100644
--- a/arch/ia64/kernel/salinfo.c
+++ b/arch/ia64/kernel/salinfo.c
@@ -141,7 +141,7 @@ enum salinfo_state {
struct salinfo_data {
cpumask_t cpu_event; /* which cpus have outstanding events */
- struct semaphore mutex;
+ wait_queue_head_t read_wait;
u8 *log_buffer;
u64 log_size;
u8 *oemdata; /* decoded oem data */
@@ -182,21 +182,6 @@ struct salinfo_platform_oemdata_parms {
int ret;
};
-/* Kick the mutex that tells user space that there is work to do. Instead of
- * trying to track the state of the mutex across multiple cpus, in user
- * context, interrupt context, non-maskable interrupt context and hotplug cpu,
- * it is far easier just to grab the mutex if it is free then release it.
- *
- * This routine must be called with data_saved_lock held, to make the down/up
- * operation atomic.
- */
-static void
-salinfo_work_to_do(struct salinfo_data *data)
-{
- (void)(down_trylock(&data->mutex) ?: 0);
- up(&data->mutex);
-}
-
static void
salinfo_platform_oemdata_cpu(void *context)
{
@@ -258,7 +243,7 @@ salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
}
cpumask_set_cpu(smp_processor_id(), &data->cpu_event);
if (irqsafe) {
- salinfo_work_to_do(data);
+ wake_up_interruptible(&data->read_wait);
spin_unlock_irqrestore(&data_saved_lock, flags);
}
}
@@ -271,14 +256,10 @@ extern void ia64_mlogbuf_dump(void);
static void
salinfo_timeout_check(struct salinfo_data *data)
{
- unsigned long flags;
if (!data->open)
return;
- if (!cpumask_empty(&data->cpu_event)) {
- spin_lock_irqsave(&data_saved_lock, flags);
- salinfo_work_to_do(data);
- spin_unlock_irqrestore(&data_saved_lock, flags);
- }
+ if (!cpumask_empty(&data->cpu_event))
+ wake_up_interruptible(&data->read_wait);
}
static void
@@ -308,10 +289,11 @@ salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t
int i, n, cpu = -1;
retry:
- if (cpumask_empty(&data->cpu_event) && down_trylock(&data->mutex)) {
+ if (cpumask_empty(&data->cpu_event)) {
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
- if (down_interruptible(&data->mutex))
+ if (wait_event_interruptible(data->read_wait,
+ !cpumask_empty(&data->cpu_event)))
return -EINTR;
}
@@ -510,7 +492,7 @@ salinfo_log_clear(struct salinfo_data *data, int cpu)
if (data->state == STATE_LOG_RECORD) {
spin_lock_irqsave(&data_saved_lock, flags);
cpumask_set_cpu(cpu, &data->cpu_event);
- salinfo_work_to_do(data);
+ wake_up_interruptible(&data->read_wait);
spin_unlock_irqrestore(&data_saved_lock, flags);
}
return 0;
@@ -582,7 +564,7 @@ salinfo_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu
i < ARRAY_SIZE(salinfo_data);
++i, ++data) {
cpumask_set_cpu(cpu, &data->cpu_event);
- salinfo_work_to_do(data);
+ wake_up_interruptible(&data->read_wait);
}
spin_unlock_irqrestore(&data_saved_lock, flags);
break;
@@ -640,7 +622,7 @@ salinfo_init(void)
for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) {
data = salinfo_data + i;
data->type = i;
- sema_init(&data->mutex, 1);
+ init_waitqueue_head(&data->read_wait);
dir = proc_mkdir(salinfo_log_name[i], salinfo_dir);
if (!dir)
continue;
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index c8dbe2acd735..6f892b94e906 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -355,7 +355,7 @@ static struct irqaction timer_irqaction = {
.name = "timer"
};
-void read_persistent_clock(struct timespec *ts)
+void read_persistent_clock64(struct timespec64 *ts)
{
efi_gettimeofday(ts);
}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 7f80a75ee9e3..7f5a58225385 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -879,7 +879,7 @@ extern void efi_init (void);
extern void *efi_get_pal_addr (void);
extern void efi_map_pal_code (void);
extern void efi_memmap_walk (efi_freemem_callback_t callback, void *arg);
-extern void efi_gettimeofday (struct timespec *ts);
+extern void efi_gettimeofday (struct timespec64 *ts);
extern void efi_enter_virtual_mode (void); /* switch EFI to virtual mode, if possible */
#ifdef CONFIG_X86
extern void efi_late_init(void);