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

From: Arnd Bergmann
Date: Mon Apr 23 2018 - 04:37:13 EST


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@xxxxxxxx>
---
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