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Date: Wed, 19 Aug 2009 08:44:24 +0100
From: "Jan Beulich" <JBeulich@...ell.com>
To: <mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc: <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: simplify HPET code
On 64-bits, using unsigned long when unsigned int suffices needlessly
creates larger code (due to the need for REX prefixes), and most of the
logic in hpet.c really doesn't need 64-bit operations. At once this
avoids the need for a couple of type casts.
Signed-off-by: Jan Beulich <jbeulich@...ell.com>
---
arch/x86/include/asm/hpet.h | 2 -
arch/x86/kernel/hpet.c | 45 ++++++++++++++++++++++----------------------
2 files changed, 24 insertions(+), 23 deletions(-)
--- linux-2.6.31-rc6/arch/x86/include/asm/hpet.h 2008-12-25 00:26:37.000000000 +0100
+++ 2.6.31-rc6-x86-hpet-simplify/arch/x86/include/asm/hpet.h 2009-07-29 12:36:03.000000000 +0200
@@ -69,7 +69,7 @@ extern int hpet_force_user;
extern int is_hpet_enabled(void);
extern int hpet_enable(void);
extern void hpet_disable(void);
-extern unsigned long hpet_readl(unsigned long a);
+extern unsigned int hpet_readl(unsigned int a);
extern void force_hpet_resume(void);
extern void hpet_msi_unmask(unsigned int irq);
--- linux-2.6.31-rc6/arch/x86/kernel/hpet.c 2009-08-18 15:31:16.000000000 +0200
+++ 2.6.31-rc6-x86-hpet-simplify/arch/x86/kernel/hpet.c 2009-07-29 12:36:03.000000000 +0200
@@ -47,12 +47,12 @@ struct hpet_dev {
char name[10];
};
-unsigned long hpet_readl(unsigned long a)
+inline unsigned int hpet_readl(unsigned int a)
{
return readl(hpet_virt_address + a);
}
-static inline void hpet_writel(unsigned long d, unsigned long a)
+static inline void hpet_writel(unsigned int d, unsigned int a)
{
writel(d, hpet_virt_address + a);
}
@@ -167,7 +167,7 @@ do { \
static void hpet_reserve_msi_timers(struct hpet_data *hd);
-static void hpet_reserve_platform_timers(unsigned long id)
+static void hpet_reserve_platform_timers(unsigned int id)
{
struct hpet __iomem *hpet = hpet_virt_address;
struct hpet_timer __iomem *timer = &hpet->hpet_timers[2];
@@ -205,7 +205,7 @@ static void hpet_reserve_platform_timers
}
#else
-static void hpet_reserve_platform_timers(unsigned long id) { }
+static void hpet_reserve_platform_timers(unsigned int id) { }
#endif
/*
@@ -246,7 +246,7 @@ static void hpet_reset_counter(void)
static void hpet_start_counter(void)
{
- unsigned long cfg = hpet_readl(HPET_CFG);
+ unsigned int cfg = hpet_readl(HPET_CFG);
cfg |= HPET_CFG_ENABLE;
hpet_writel(cfg, HPET_CFG);
}
@@ -271,7 +271,7 @@ static void hpet_resume_counter(void)
static void hpet_enable_legacy_int(void)
{
- unsigned long cfg = hpet_readl(HPET_CFG);
+ unsigned int cfg = hpet_readl(HPET_CFG);
cfg |= HPET_CFG_LEGACY;
hpet_writel(cfg, HPET_CFG);
@@ -314,7 +314,7 @@ static int hpet_setup_msi_irq(unsigned i
static void hpet_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt, int timer)
{
- unsigned long cfg, cmp, now;
+ unsigned int cfg, cmp, now;
uint64_t delta;
switch (mode) {
@@ -323,7 +323,7 @@ static void hpet_set_mode(enum clock_eve
delta = ((uint64_t)(NSEC_PER_SEC/HZ)) * evt->mult;
delta >>= evt->shift;
now = hpet_readl(HPET_COUNTER);
- cmp = now + (unsigned long) delta;
+ cmp = now + (unsigned int) delta;
cfg = hpet_readl(HPET_Tn_CFG(timer));
/* Make sure we use edge triggered interrupts */
cfg &= ~HPET_TN_LEVEL;
@@ -339,7 +339,7 @@ static void hpet_set_mode(enum clock_eve
* (See AMD-8111 HyperTransport I/O Hub Data Sheet,
* Publication # 24674)
*/
- hpet_writel((unsigned long) delta, HPET_Tn_CMP(timer));
+ hpet_writel((unsigned int) delta, HPET_Tn_CMP(timer));
hpet_start_counter();
hpet_print_config();
break;
@@ -387,9 +387,9 @@ static int hpet_next_event(unsigned long
* what we wrote hit the chip before we compare it to the
* counter.
*/
- WARN_ON_ONCE((u32)hpet_readl(HPET_Tn_CMP(timer)) != cnt);
+ WARN_ON_ONCE(hpet_readl(HPET_Tn_CMP(timer)) != cnt);
- return (s32)((u32)hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0;
+ return (s32)(hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0;
}
static void hpet_legacy_set_mode(enum clock_event_mode mode,
@@ -415,7 +415,7 @@ static struct hpet_dev *hpet_devs;
void hpet_msi_unmask(unsigned int irq)
{
struct hpet_dev *hdev = get_irq_data(irq);
- unsigned long cfg;
+ unsigned int cfg;
/* unmask it */
cfg = hpet_readl(HPET_Tn_CFG(hdev->num));
@@ -425,7 +425,7 @@ void hpet_msi_unmask(unsigned int irq)
void hpet_msi_mask(unsigned int irq)
{
- unsigned long cfg;
+ unsigned int cfg;
struct hpet_dev *hdev = get_irq_data(irq);
/* mask it */
@@ -598,7 +598,7 @@ static void hpet_msi_capability_lookup(u
for (i = start_timer; i < num_timers - RESERVE_TIMERS; i++) {
struct hpet_dev *hdev = &hpet_devs[num_timers_used];
- unsigned long cfg = hpet_readl(HPET_Tn_CFG(i));
+ unsigned int cfg = hpet_readl(HPET_Tn_CFG(i));
/* Only consider HPET timer with MSI support */
if (!(cfg & HPET_TN_FSB_CAP))
@@ -813,7 +813,7 @@ static int hpet_clocksource_register(voi
*/
int __init hpet_enable(void)
{
- unsigned long id;
+ unsigned int id;
int i;
if (!is_hpet_capable())
@@ -925,7 +925,7 @@ fs_initcall(hpet_late_init);
void hpet_disable(void)
{
if (is_hpet_capable()) {
- unsigned long cfg = hpet_readl(HPET_CFG);
+ unsigned int cfg = hpet_readl(HPET_CFG);
if (hpet_legacy_int_enabled) {
cfg &= ~HPET_CFG_LEGACY;
@@ -965,8 +965,8 @@ static int hpet_prev_update_sec;
static struct rtc_time hpet_alarm_time;
static unsigned long hpet_pie_count;
static u32 hpet_t1_cmp;
-static unsigned long hpet_default_delta;
-static unsigned long hpet_pie_delta;
+static u32 hpet_default_delta;
+static u32 hpet_pie_delta;
static unsigned long hpet_pie_limit;
static rtc_irq_handler irq_handler;
@@ -1017,7 +1017,8 @@ EXPORT_SYMBOL_GPL(hpet_unregister_irq_ha
*/
int hpet_rtc_timer_init(void)
{
- unsigned long cfg, cnt, delta, flags;
+ unsigned int cfg, cnt, delta;
+ unsigned long flags;
if (!is_hpet_enabled())
return 0;
@@ -1027,7 +1028,7 @@ int hpet_rtc_timer_init(void)
clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC;
clc >>= hpet_clockevent.shift + DEFAULT_RTC_SHIFT;
- hpet_default_delta = (unsigned long) clc;
+ hpet_default_delta = clc;
}
if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit)
@@ -1113,7 +1114,7 @@ int hpet_set_periodic_freq(unsigned long
clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC;
do_div(clc, freq);
clc >>= hpet_clockevent.shift;
- hpet_pie_delta = (unsigned long) clc;
+ hpet_pie_delta = clc;
}
return 1;
}
@@ -1127,7 +1128,7 @@ EXPORT_SYMBOL_GPL(hpet_rtc_dropped_irq);
static void hpet_rtc_timer_reinit(void)
{
- unsigned long cfg, delta;
+ unsigned int cfg, delta;
int lost_ints = -1;
if (unlikely(!hpet_rtc_flags)) {
--
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