[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 <a...@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