[PATCH 1/5] powerpc: always enable RTC_LIB

[PATCH 1/5] powerpc: always enable RTC_LIB

[Arnd Bergmann]

In order to use the rtc_tm_to_time64() and rtc_time64_to_tm()
helper functions in later patches, we have to ensure that
CONFIG_RTC_LIB is always built-in.

Note that this symbol only controls a couple of helper functions,
not the actual RTC subsystem, which remains optional and is
enabled with CONFIG_RTC_CLASS.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/powerpc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c32a181a7cbb..de2cda320fdd 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -232,6 +232,7 @@ config PPC
 	select OF_RESERVED_MEM
 	select OLD_SIGACTION			if PPC32
 	select OLD_SIGSUSPEND
+	select RTC_LIB
 	select SPARSE_IRQ
 	select SYSCTL_EXCEPTION_TRACE
 	select VIRT_TO_BUS			if !PPC64
-- 
2.9.0

[PATCH 2/5] powerpc: rtas: clean up time handling

[Arnd Bergmann]

The to_tm() helper function operates on a signed integer for the time,
so it will suffer from overflow in 2038, even on 64-bit kernels.

Rather than fix that function, this replaces its use in the rtas
procfs implementation with the standard rtc_time64_to_tm() helper
that is very similar but is not affected by the overflow.

In order to actually support long times, the parser function gets
changed to 64-bit user input and output as well. Note that the tm_mon
and tm_year representation is slightly different, so we have to manually
add an offset here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2: fix up rtc_time64_to_tm() calling conventions
---
 arch/powerpc/kernel/rtas-proc.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/kernel/rtas-proc.c b/arch/powerpc/kernel/rtas-proc.c
index fb070d8cad07..815027476600 100644
--- a/arch/powerpc/kernel/rtas-proc.c
+++ b/arch/powerpc/kernel/rtas-proc.c
@@ -280,7 +280,7 @@ static int __init proc_rtas_init(void)
 
 __initcall(proc_rtas_init);
 
-static int parse_number(const char __user *p, size_t count, unsigned long *val)
+static int parse_number(const char __user *p, size_t count, u64 *val)
 {
 	char buf[40];
 	char *end;
@@ -293,7 +293,7 @@ static int parse_number(const char __user *p, size_t count, unsigned long *val)
 
 	buf[count] = 0;
 
-	*val = simple_strtoul(buf, &end, 10);
+	*val = simple_strtoull(buf, &end, 10);
 	if (*end && *end != '\n')
 		return -EINVAL;
 
@@ -307,17 +307,17 @@ static ssize_t ppc_rtas_poweron_write(struct file *file,
 		const char __user *buf, size_t count, loff_t *ppos)
 {
 	struct rtc_time tm;
-	unsigned long nowtime;
+	time64_t nowtime;
 	int error = parse_number(buf, count, &nowtime);
 	if (error)
 		return error;
 
 	power_on_time = nowtime; /* save the time */
 
-	to_tm(nowtime, &tm);
+	rtc_time64_to_tm(nowtime, &tm);
 
 	error = rtas_call(rtas_token("set-time-for-power-on"), 7, 1, NULL, 
-			tm.tm_year, tm.tm_mon, tm.tm_mday, 
+			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
 			tm.tm_hour, tm.tm_min, tm.tm_sec, 0 /* nano */);
 	if (error)
 		printk(KERN_WARNING "error: setting poweron time returned: %s\n", 
@@ -373,14 +373,14 @@ static ssize_t ppc_rtas_clock_write(struct file *file,
 		const char __user *buf, size_t count, loff_t *ppos)
 {
 	struct rtc_time tm;
-	unsigned long nowtime;
+	time64_t nowtime;
 	int error = parse_number(buf, count, &nowtime);
 	if (error)
 		return error;
 
-	to_tm(nowtime, &tm);
+	rtc_time64_to_tm(nowtime, &tm);
 	error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL, 
-			tm.tm_year, tm.tm_mon, tm.tm_mday, 
+			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
 			tm.tm_hour, tm.tm_min, tm.tm_sec, 0);
 	if (error)
 		printk(KERN_WARNING "error: setting the clock returned: %s\n", 
@@ -401,8 +401,8 @@ static int ppc_rtas_clock_show(struct seq_file *m, void *v)
 		unsigned int year, mon, day, hour, min, sec;
 		year = ret[0]; mon  = ret[1]; day  = ret[2];
 		hour = ret[3]; min  = ret[4]; sec  = ret[5];
-		seq_printf(m, "%lu\n",
-				mktime(year, mon, day, hour, min, sec));
+		seq_printf(m, "%lld\n",
+				mktime64(year, mon, day, hour, min, sec));
 	}
 	return 0;
 }
@@ -731,7 +731,7 @@ static void get_location_code(struct seq_file *m, struct individual_sensor *s,
 static ssize_t ppc_rtas_tone_freq_write(struct file *file,
 		const char __user *buf, size_t count, loff_t *ppos)
 {
-	unsigned long freq;
+	u64 freq;
 	int error = parse_number(buf, count, &freq);
 	if (error)
 		return error;
@@ -756,7 +756,7 @@ static int ppc_rtas_tone_freq_show(struct seq_file *m, void *v)
 static ssize_t ppc_rtas_tone_volume_write(struct file *file,
 		const char __user *buf, size_t count, loff_t *ppos)
 {
-	unsigned long volume;
+	u64 volume;
 	int error = parse_number(buf, count, &volume);
 	if (error)
 		return error;
-- 
2.9.0

[PATCH 3/5] powerpc: use time64_t in read_persistent_clock

[Arnd Bergmann]

Looking through the remaining users of the deprecated mktime()
function, I found the powerpc rtc handlers, which use it in
place of rtc_tm_to_time64().

To clean this up, I'm changing over the read_persistent_clock()
function to the read_persistent_clock64() variant, and change
all the platform specific handlers along with it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2: fix a typo: rtc_tm_to_time66 -> rtc_tm_to_time64
---
 arch/powerpc/include/asm/machdep.h        |  2 +-
 arch/powerpc/include/asm/opal.h           |  2 +-
 arch/powerpc/include/asm/rtas.h           |  2 +-
 arch/powerpc/kernel/rtas-rtc.c            |  4 ++--
 arch/powerpc/kernel/time.c                |  7 +++----
 arch/powerpc/platforms/8xx/m8xx_setup.c   |  4 +---
 arch/powerpc/platforms/maple/maple.h      |  2 +-
 arch/powerpc/platforms/maple/time.c       |  5 ++---
 arch/powerpc/platforms/pasemi/pasemi.h    |  2 +-
 arch/powerpc/platforms/pasemi/time.c      |  4 ++--
 arch/powerpc/platforms/powermac/pmac.h    |  2 +-
 arch/powerpc/platforms/powermac/time.c    | 31 +++++++++++--------------------
 arch/powerpc/platforms/powernv/opal-rtc.c |  5 ++---
 arch/powerpc/platforms/ps3/platform.h     |  2 +-
 arch/powerpc/platforms/ps3/time.c         |  2 +-
 15 files changed, 31 insertions(+), 45 deletions(-)

diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index ffe7c71e1132..a47de82fb8e2 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -83,7 +83,7 @@ struct machdep_calls {
 
 	int		(*set_rtc_time)(struct rtc_time *);
 	void		(*get_rtc_time)(struct rtc_time *);
-	unsigned long	(*get_boot_time)(void);
+	time64_t	(*get_boot_time)(void);
 	unsigned char 	(*rtc_read_val)(int addr);
 	void		(*rtc_write_val)(int addr, unsigned char val);
 
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 03e1a920491e..fc211bd98e0f 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -325,7 +325,7 @@ extern int opal_async_wait_response_interruptible(uint64_t token,
 extern int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data);
 
 struct rtc_time;
-extern unsigned long opal_get_boot_time(void);
+extern time64_t opal_get_boot_time(void);
 extern void opal_nvram_init(void);
 extern void opal_flash_update_init(void);
 extern void opal_flash_update_print_message(void);
diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h
index ec9dd79398ee..71e393c46a49 100644
--- a/arch/powerpc/include/asm/rtas.h
+++ b/arch/powerpc/include/asm/rtas.h
@@ -361,7 +361,7 @@ extern int rtas_offline_cpus_mask(cpumask_var_t cpus);
 extern int rtas_ibm_suspend_me(u64 handle);
 
 struct rtc_time;
-extern unsigned long rtas_get_boot_time(void);
+extern time64_t rtas_get_boot_time(void);
 extern void rtas_get_rtc_time(struct rtc_time *rtc_time);
 extern int rtas_set_rtc_time(struct rtc_time *rtc_time);
 
diff --git a/arch/powerpc/kernel/rtas-rtc.c b/arch/powerpc/kernel/rtas-rtc.c
index 49600985c7ef..a28239b8b0c0 100644
--- a/arch/powerpc/kernel/rtas-rtc.c
+++ b/arch/powerpc/kernel/rtas-rtc.c
@@ -13,7 +13,7 @@
 
 #define MAX_RTC_WAIT 5000	/* 5 sec */
 #define RTAS_CLOCK_BUSY (-2)
-unsigned long __init rtas_get_boot_time(void)
+time64_t __init rtas_get_boot_time(void)
 {
 	int ret[8];
 	int error;
@@ -38,7 +38,7 @@ unsigned long __init rtas_get_boot_time(void)
 		return 0;
 	}
 
-	return mktime(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]);
+	return mktime64(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]);
 }
 
 /* NOTE: get_rtc_time will get an error if executed in interrupt context
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 360e71d455cc..afb27962b396 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -795,7 +795,7 @@ int update_persistent_clock(struct timespec now)
 	return ppc_md.set_rtc_time(&tm);
 }
 
-static void __read_persistent_clock(struct timespec *ts)
+static void __read_persistent_clock(struct timespec64 *ts)
 {
 	struct rtc_time tm;
 	static int first = 1;
@@ -819,11 +819,10 @@ static void __read_persistent_clock(struct timespec *ts)
 	}
 	ppc_md.get_rtc_time(&tm);
 
-	ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
-			    tm.tm_hour, tm.tm_min, tm.tm_sec);
+	ts->tv_sec = rtc_tm_to_time64(&tm);
 }
 
-void read_persistent_clock(struct timespec *ts)
+void read_persistent_clock64(struct timespec64 *ts)
 {
 	__read_persistent_clock(ts);
 
diff --git a/arch/powerpc/platforms/8xx/m8xx_setup.c b/arch/powerpc/platforms/8xx/m8xx_setup.c
index 2188d691a40f..d76daa90647b 100644
--- a/arch/powerpc/platforms/8xx/m8xx_setup.c
+++ b/arch/powerpc/platforms/8xx/m8xx_setup.c
@@ -192,9 +192,7 @@ void mpc8xx_get_rtc_time(struct rtc_time *tm)
 
 	/* Get time from the RTC. */
 	data = in_be32(&sys_tmr->sit_rtc);
-	to_tm(data, tm);
-	tm->tm_year -= 1900;
-	tm->tm_mon -= 1;
+	rtc_time64_to_tm(data, tm);
 	immr_unmap(sys_tmr);
 	return;
 }
diff --git a/arch/powerpc/platforms/maple/maple.h b/arch/powerpc/platforms/maple/maple.h
index d10f4af3a42e..4f358b55c341 100644
--- a/arch/powerpc/platforms/maple/maple.h
+++ b/arch/powerpc/platforms/maple/maple.h
@@ -6,7 +6,7 @@
  */
 extern int maple_set_rtc_time(struct rtc_time *tm);
 extern void maple_get_rtc_time(struct rtc_time *tm);
-extern unsigned long maple_get_boot_time(void);
+extern time64_t maple_get_boot_time(void);
 extern void maple_calibrate_decr(void);
 extern void maple_pci_init(void);
 extern void maple_pci_irq_fixup(struct pci_dev *dev);
diff --git a/arch/powerpc/platforms/maple/time.c b/arch/powerpc/platforms/maple/time.c
index cfddc87f81bf..becf2ebf7df5 100644
--- a/arch/powerpc/platforms/maple/time.c
+++ b/arch/powerpc/platforms/maple/time.c
@@ -137,7 +137,7 @@ static struct resource rtc_iores = {
 	.flags = IORESOURCE_IO | IORESOURCE_BUSY,
 };
 
-unsigned long __init maple_get_boot_time(void)
+time64_t __init maple_get_boot_time(void)
 {
 	struct rtc_time tm;
 	struct device_node *rtcs;
@@ -170,7 +170,6 @@ unsigned long __init maple_get_boot_time(void)
 	request_resource(&ioport_resource, &rtc_iores);
 
 	maple_get_rtc_time(&tm);
-	return mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
-		      tm.tm_hour, tm.tm_min, tm.tm_sec);
+	return rtc_tm_to_time64(&tm);
 }
 
diff --git a/arch/powerpc/platforms/pasemi/pasemi.h b/arch/powerpc/platforms/pasemi/pasemi.h
index 329d2a619254..70b56048ed1b 100644
--- a/arch/powerpc/platforms/pasemi/pasemi.h
+++ b/arch/powerpc/platforms/pasemi/pasemi.h
@@ -2,7 +2,7 @@
 #ifndef _PASEMI_PASEMI_H
 #define _PASEMI_PASEMI_H
 
-extern unsigned long pas_get_boot_time(void);
+extern time64_t pas_get_boot_time(void);
 extern void pas_pci_init(void);
 extern void pas_pci_irq_fixup(struct pci_dev *dev);
 extern void pas_pci_dma_dev_setup(struct pci_dev *dev);
diff --git a/arch/powerpc/platforms/pasemi/time.c b/arch/powerpc/platforms/pasemi/time.c
index fa54351ac268..ea815254ee7b 100644
--- a/arch/powerpc/platforms/pasemi/time.c
+++ b/arch/powerpc/platforms/pasemi/time.c
@@ -21,8 +21,8 @@
 
 #include <asm/time.h>
 
-unsigned long __init pas_get_boot_time(void)
+time64_t __init pas_get_boot_time(void)
 {
 	/* Let's just return a fake date right now */
-	return mktime(2006, 1, 1, 12, 0, 0);
+	return mktime64(2006, 1, 1, 12, 0, 0);
 }
diff --git a/arch/powerpc/platforms/powermac/pmac.h b/arch/powerpc/platforms/powermac/pmac.h
index 6f15b8804e9b..16a52afdb76e 100644
--- a/arch/powerpc/platforms/powermac/pmac.h
+++ b/arch/powerpc/platforms/powermac/pmac.h
@@ -15,7 +15,7 @@ struct rtc_time;
 extern int pmac_newworld;
 
 extern long pmac_time_init(void);
-extern unsigned long pmac_get_boot_time(void);
+extern time64_t pmac_get_boot_time(void);
 extern void pmac_get_rtc_time(struct rtc_time *);
 extern int pmac_set_rtc_time(struct rtc_time *);
 extern void pmac_read_rtc_time(void);
diff --git a/arch/powerpc/platforms/powermac/time.c b/arch/powerpc/platforms/powermac/time.c
index 274af6fa388e..d5d1c452038e 100644
--- a/arch/powerpc/platforms/powermac/time.c
+++ b/arch/powerpc/platforms/powermac/time.c
@@ -84,15 +84,6 @@ long __init pmac_time_init(void)
 	return delta;
 }
 
-#if defined(CONFIG_ADB_CUDA) || defined(CONFIG_ADB_PMU)
-static void to_rtc_time(unsigned long now, struct rtc_time *tm)
-{
-	to_tm(now, tm);
-	tm->tm_year -= 1900;
-	tm->tm_mon -= 1;
-}
-#endif
-
 #if defined(CONFIG_ADB_CUDA) || defined(CONFIG_ADB_PMU) || \
     defined(CONFIG_PMAC_SMU)
 static unsigned long from_rtc_time(struct rtc_time *tm)
@@ -103,10 +94,10 @@ static unsigned long from_rtc_time(struct rtc_time *tm)
 #endif
 
 #ifdef CONFIG_ADB_CUDA
-static unsigned long cuda_get_time(void)
+static time64_t cuda_get_time(void)
 {
 	struct adb_request req;
-	unsigned int now;
+	time64_t now;
 
 	if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
 		return 0;
@@ -117,10 +108,10 @@ static unsigned long cuda_get_time(void)
 		       req.reply_len);
 	now = (req.reply[3] << 24) + (req.reply[4] << 16)
 		+ (req.reply[5] << 8) + req.reply[6];
-	return ((unsigned long)now) - RTC_OFFSET;
+	return now - RTC_OFFSET;
 }
 
-#define cuda_get_rtc_time(tm)	to_rtc_time(cuda_get_time(), (tm))
+#define cuda_get_rtc_time(tm)	rtc_time64_to_tm(cuda_get_time(), (tm))
 
 static int cuda_set_rtc_time(struct rtc_time *tm)
 {
@@ -147,10 +138,10 @@ static int cuda_set_rtc_time(struct rtc_time *tm)
 #endif
 
 #ifdef CONFIG_ADB_PMU
-static unsigned long pmu_get_time(void)
+static time64_t pmu_get_time(void)
 {
 	struct adb_request req;
-	unsigned int now;
+	time64_t now;
 
 	if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
 		return 0;
@@ -160,10 +151,10 @@ static unsigned long pmu_get_time(void)
 		       req.reply_len);
 	now = (req.reply[0] << 24) + (req.reply[1] << 16)
 		+ (req.reply[2] << 8) + req.reply[3];
-	return ((unsigned long)now) - RTC_OFFSET;
+	return now - RTC_OFFSET;
 }
 
-#define pmu_get_rtc_time(tm)	to_rtc_time(pmu_get_time(), (tm))
+#define pmu_get_rtc_time(tm)	rtc_time64_to_tm(pmu_get_time(), (tm))
 
 static int pmu_set_rtc_time(struct rtc_time *tm)
 {
@@ -188,13 +179,13 @@ static int pmu_set_rtc_time(struct rtc_time *tm)
 #endif
 
 #ifdef CONFIG_PMAC_SMU
-static unsigned long smu_get_time(void)
+static time64_t smu_get_time(void)
 {
 	struct rtc_time tm;
 
 	if (smu_get_rtc_time(&tm, 1))
 		return 0;
-	return from_rtc_time(&tm);
+	return rtc_tm_to_time64(&tm);
 }
 
 #else
@@ -204,7 +195,7 @@ static unsigned long smu_get_time(void)
 #endif
 
 /* Can't be __init, it's called when suspending and resuming */
-unsigned long pmac_get_boot_time(void)
+time64_t pmac_get_boot_time(void)
 {
 	/* Get the time from the RTC, used only at boot time */
 	switch (sys_ctrler) {
diff --git a/arch/powerpc/platforms/powernv/opal-rtc.c b/arch/powerpc/platforms/powernv/opal-rtc.c
index f8868864f373..f515c4a76900 100644
--- a/arch/powerpc/platforms/powernv/opal-rtc.c
+++ b/arch/powerpc/platforms/powernv/opal-rtc.c
@@ -34,7 +34,7 @@ static void opal_to_tm(u32 y_m_d, u64 h_m_s_ms, struct rtc_time *tm)
 	tm->tm_wday     = -1;
 }
 
-unsigned long __init opal_get_boot_time(void)
+time64_t __init opal_get_boot_time(void)
 {
 	struct rtc_time tm;
 	u32 y_m_d;
@@ -59,8 +59,7 @@ unsigned long __init opal_get_boot_time(void)
 	y_m_d = be32_to_cpu(__y_m_d);
 	h_m_s_ms = be64_to_cpu(__h_m_s_ms);
 	opal_to_tm(y_m_d, h_m_s_ms, &tm);
-	return mktime(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
-		      tm.tm_hour, tm.tm_min, tm.tm_sec);
+	return rtc_tm_to_time64(&tm);
 }
 
 static __init int opal_time_init(void)
diff --git a/arch/powerpc/platforms/ps3/platform.h b/arch/powerpc/platforms/ps3/platform.h
index 1809cfc562ee..9bc68f913466 100644
--- a/arch/powerpc/platforms/ps3/platform.h
+++ b/arch/powerpc/platforms/ps3/platform.h
@@ -57,7 +57,7 @@ static inline void ps3_smp_cleanup_cpu(int cpu) { }
 /* time */
 
 void __init ps3_calibrate_decr(void);
-unsigned long __init ps3_get_boot_time(void);
+time64_t __init ps3_get_boot_time(void);
 void ps3_get_rtc_time(struct rtc_time *time);
 int ps3_set_rtc_time(struct rtc_time *time);
 
diff --git a/arch/powerpc/platforms/ps3/time.c b/arch/powerpc/platforms/ps3/time.c
index 11b45b58c81b..9dac125c997e 100644
--- a/arch/powerpc/platforms/ps3/time.c
+++ b/arch/powerpc/platforms/ps3/time.c
@@ -76,7 +76,7 @@ static u64 read_rtc(void)
 	return rtc_val;
 }
 
-unsigned long __init ps3_get_boot_time(void)
+time64_t __init ps3_get_boot_time(void)
 {
 	return read_rtc() + ps3_os_area_get_rtc_diff();
 }
-- 
2.9.0

[PATCH 4/5] powerpc: use time64_t in update_persistent_clock

[Arnd Bergmann]

update_persistent_clock() is deprecated because it suffers from overflow
in 2038 on 32-bit architectures. This changes powerpc to use the
update_persistent_clock64() replacement, and to pass down 64-bit
timestamps consistently.

This is now simpler, as we no longer have to worry about the offset
numbers in tm_year and tm_mon that are different between the Linux
conventions and RTAS.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/powerpc/kernel/time.c              |  6 ++----
 arch/powerpc/platforms/8xx/m8xx_setup.c |  7 +++----
 arch/powerpc/platforms/powermac/time.c  | 17 ++++-------------
 3 files changed, 9 insertions(+), 21 deletions(-)

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index afb27962b396..f9b0baa3fa2b 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -781,16 +781,14 @@ void __init generic_calibrate_decr(void)
 	}
 }
 
-int update_persistent_clock(struct timespec now)
+int update_persistent_clock64(struct timespec64 now)
 {
 	struct rtc_time tm;
 
 	if (!ppc_md.set_rtc_time)
 		return -ENODEV;
 
-	to_tm(now.tv_sec + 1 + timezone_offset, &tm);
-	tm.tm_year -= 1900;
-	tm.tm_mon -= 1;
+	rtc_time64_to_tm(now.tv_sec + 1 + timezone_offset, &tm);
 
 	return ppc_md.set_rtc_time(&tm);
 }
diff --git a/arch/powerpc/platforms/8xx/m8xx_setup.c b/arch/powerpc/platforms/8xx/m8xx_setup.c
index d76daa90647b..027c42d8966c 100644
--- a/arch/powerpc/platforms/8xx/m8xx_setup.c
+++ b/arch/powerpc/platforms/8xx/m8xx_setup.c
@@ -169,15 +169,14 @@ int mpc8xx_set_rtc_time(struct rtc_time *tm)
 {
 	sitk8xx_t __iomem *sys_tmr1;
 	sit8xx_t __iomem *sys_tmr2;
-	int time;
+	time64_t time;
 
 	sys_tmr1 = immr_map(im_sitk);
 	sys_tmr2 = immr_map(im_sit);
-	time = mktime(tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
-	              tm->tm_hour, tm->tm_min, tm->tm_sec);
+	time = rtc_tm_to_time64(tm);
 
 	out_be32(&sys_tmr1->sitk_rtck, KAPWR_KEY);
-	out_be32(&sys_tmr2->sit_rtc, time);
+	out_be32(&sys_tmr2->sit_rtc, (u32)time);
 	out_be32(&sys_tmr1->sitk_rtck, ~KAPWR_KEY);
 
 	immr_unmap(sys_tmr2);
diff --git a/arch/powerpc/platforms/powermac/time.c b/arch/powerpc/platforms/powermac/time.c
index d5d1c452038e..7c968e46736f 100644
--- a/arch/powerpc/platforms/powermac/time.c
+++ b/arch/powerpc/platforms/powermac/time.c
@@ -84,15 +84,6 @@ long __init pmac_time_init(void)
 	return delta;
 }
 
-#if defined(CONFIG_ADB_CUDA) || defined(CONFIG_ADB_PMU) || \
-    defined(CONFIG_PMAC_SMU)
-static unsigned long from_rtc_time(struct rtc_time *tm)
-{
-	return mktime(tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
-		      tm->tm_hour, tm->tm_min, tm->tm_sec);
-}
-#endif
-
 #ifdef CONFIG_ADB_CUDA
 static time64_t cuda_get_time(void)
 {
@@ -115,10 +106,10 @@ static time64_t cuda_get_time(void)
 
 static int cuda_set_rtc_time(struct rtc_time *tm)
 {
-	unsigned int nowtime;
+	time64_t nowtime;
 	struct adb_request req;
 
-	nowtime = from_rtc_time(tm) + RTC_OFFSET;
+	nowtime = rtc_tm_to_time64(tm) + RTC_OFFSET;
 	if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
 			 nowtime >> 24, nowtime >> 16, nowtime >> 8,
 			 nowtime) < 0)
@@ -158,10 +149,10 @@ static time64_t pmu_get_time(void)
 
 static int pmu_set_rtc_time(struct rtc_time *tm)
 {
-	unsigned int nowtime;
+	time64_t nowtime;
 	struct adb_request req;
 
-	nowtime = from_rtc_time(tm) + RTC_OFFSET;
+	nowtime = rtc_tm_to_time64(tm) + RTC_OFFSET;
 	if (pmu_request(&req, NULL, 5, PMU_SET_RTC, nowtime >> 24,
 			nowtime >> 16, nowtime >> 8, nowtime) < 0)
 		return -ENXIO;
-- 
2.9.0

[PATCH 5/5] powerpc: remove unused to_tm() helper

[Arnd Bergmann]

to_tm() is now completely unused, the only reference being in the
_dump_time() helper that is also unused. This removes both, leaving
the rest of the powerpc RTC code y2038 safe to as far as the hardware
supports.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/powerpc/include/asm/time.h   |  2 --
 arch/powerpc/kernel/time.c        | 50 ---------------------------------------
 arch/powerpc/platforms/ps3/time.c | 24 -------------------
 3 files changed, 76 deletions(-)

diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
index db546c034905..79bc9c3e4325 100644
--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h
@@ -26,8 +26,6 @@ extern unsigned long tb_ticks_per_usec;
 extern unsigned long tb_ticks_per_sec;
 extern struct clock_event_device decrementer_clockevent;
 
-struct rtc_time;
-extern void to_tm(int tim, struct rtc_time * tm);
 extern void tick_broadcast_ipi_handler(void);
 
 extern void generic_calibrate_decr(void);
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index f9b0baa3fa2b..79bdeea85ab4 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -1138,56 +1138,6 @@ void __init time_init(void)
 #endif
 }
 
-
-#define FEBRUARY	2
-#define	STARTOFTIME	1970
-#define SECDAY		86400L
-#define SECYR		(SECDAY * 365)
-#define	leapyear(year)		((year) % 4 == 0 && \
-				 ((year) % 100 != 0 || (year) % 400 == 0))
-#define	days_in_year(a) 	(leapyear(a) ? 366 : 365)
-#define	days_in_month(a) 	(month_days[(a) - 1])
-
-static int month_days[12] = {
-	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
-};
-
-void to_tm(int tim, struct rtc_time * tm)
-{
-	register int    i;
-	register long   hms, day;
-
-	day = tim / SECDAY;
-	hms = tim % SECDAY;
-
-	/* Hours, minutes, seconds are easy */
-	tm->tm_hour = hms / 3600;
-	tm->tm_min = (hms % 3600) / 60;
-	tm->tm_sec = (hms % 3600) % 60;
-
-	/* Number of years in days */
-	for (i = STARTOFTIME; day >= days_in_year(i); i++)
-		day -= days_in_year(i);
-	tm->tm_year = i;
-
-	/* Number of months in days left */
-	if (leapyear(tm->tm_year))
-		days_in_month(FEBRUARY) = 29;
-	for (i = 1; day >= days_in_month(i); i++)
-		day -= days_in_month(i);
-	days_in_month(FEBRUARY) = 28;
-	tm->tm_mon = i;
-
-	/* Days are what is left over (+1) from all that. */
-	tm->tm_mday = day + 1;
-
-	/*
-	 * No-one uses the day of the week.
-	 */
-	tm->tm_wday = -1;
-}
-EXPORT_SYMBOL(to_tm);
-
 /*
  * Divide a 128-bit dividend by a 32-bit divisor, leaving a 128 bit
  * result.
diff --git a/arch/powerpc/platforms/ps3/time.c b/arch/powerpc/platforms/ps3/time.c
index 9dac125c997e..08ca76e23d09 100644
--- a/arch/powerpc/platforms/ps3/time.c
+++ b/arch/powerpc/platforms/ps3/time.c
@@ -28,30 +28,6 @@
 
 #include "platform.h"
 
-#define dump_tm(_a) _dump_tm(_a, __func__, __LINE__)
-static void _dump_tm(const struct rtc_time *tm, const char* func, int line)
-{
-	pr_debug("%s:%d tm_sec  %d\n", func, line, tm->tm_sec);
-	pr_debug("%s:%d tm_min  %d\n", func, line, tm->tm_min);
-	pr_debug("%s:%d tm_hour %d\n", func, line, tm->tm_hour);
-	pr_debug("%s:%d tm_mday %d\n", func, line, tm->tm_mday);
-	pr_debug("%s:%d tm_mon  %d\n", func, line, tm->tm_mon);
-	pr_debug("%s:%d tm_year %d\n", func, line, tm->tm_year);
-	pr_debug("%s:%d tm_wday %d\n", func, line, tm->tm_wday);
-}
-
-#define dump_time(_a) _dump_time(_a, __func__, __LINE__)
-static void __maybe_unused _dump_time(int time, const char *func,
-	int line)
-{
-	struct rtc_time tm;
-
-	to_tm(time, &tm);
-
-	pr_debug("%s:%d time    %d\n", func, line, time);
-	_dump_tm(&tm, func, line);
-}
-
 void __init ps3_calibrate_decr(void)
 {
 	int result;
-- 
2.9.0

Re: [1/5] powerpc: always enable RTC_LIB

[Michael Ellerman]

On Mon, 2018-04-23 at 08:36:38 UTC, Arnd Bergmann wrote:
> In order to use the rtc_tm_to_time64() and rtc_time64_to_tm()
> helper functions in later patches, we have to ensure that
> CONFIG_RTC_LIB is always built-in.
> 
> Note that this symbol only controls a couple of helper functions,
> not the actual RTC subsystem, which remains optional and is
> enabled with CONFIG_RTC_CLASS.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/6e8cef384a41882b2d4ec6992dd0d7

cheers

[PATCH 1/5] powerpc: always enable RTC_LIB

[Arnd Bergmann]

In order to use the rtc_tm_to_time64() and rtc_time64_to_tm()
helper functions in later patches, we have to ensure that
CONFIG_RTC_LIB is always built-in.

Note that this symbol only controls a couple of helper functions,
not the actual RTC subsystem, which remains optional and is
enabled with CONFIG_RTC_CLASS.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/powerpc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c32a181a7cbb..de2cda320fdd 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -232,6 +232,7 @@ config PPC
 	select OF_RESERVED_MEM
 	select OLD_SIGACTION			if PPC32
 	select OLD_SIGSUSPEND
+	select RTC_LIB
 	select SPARSE_IRQ
 	select SYSCTL_EXCEPTION_TRACE
 	select VIRT_TO_BUS			if !PPC64
-- 
2.9.0