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Subject[PATCH v2 06/10] posix-clocks: Make compat syscalls depend on CONFIG_COMPAT_32BIT_TIME
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clock_gettime, clock_settime, clock_getres and clock_nanosleep
compat syscalls are also repurposed to provide backward compatibility
to support 32 bit time_t on 32 bit systems.

Note that nanosleep compat syscall will also be treated the same way
as the above syscalls as it shares common handler functions with
clock_nanosleep. But, there is no plan to provide y2038 safe solution
for nanosleep.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
---
kernel/time/hrtimer.c | 2 +-
kernel/time/posix-stubs.c | 2 ++
kernel/time/posix-timers.c | 14 ++++++++++++--
3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index d32520840fde..bbd740171554 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1557,7 +1557,7 @@ SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
return hrtimer_nanosleep(&tu, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
}

-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_32BIT_TIME

COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
struct compat_timespec __user *, rmtp)
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
index b258bee13b02..0645cfa93609 100644
--- a/kernel/time/posix-stubs.c
+++ b/kernel/time/posix-stubs.c
@@ -148,7 +148,9 @@ COMPAT_SYS_NI(timer_settime);
COMPAT_SYS_NI(timer_gettime);
COMPAT_SYS_NI(getitimer);
COMPAT_SYS_NI(setitimer);
+#endif

+#ifdef CONFIG_COMPAT_32BIT_TIME
COMPAT_SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
struct compat_timespec __user *, tp)
{
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 13d6881f908b..67ed5966eccd 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1107,7 +1107,7 @@ SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
return error;
}

-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_32BIT_TIME

COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
struct compat_timespec __user *, tp)
@@ -1142,6 +1142,10 @@ COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
return err;
}

+#endif
+
+#ifdef CONFIG_COMPAT
+
COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
struct compat_timex __user *, utp)
{
@@ -1166,6 +1170,10 @@ COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
return err;
}

+#endif
+
+#ifdef CONFIG_COMPAT_32BIT_TIME
+
COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
struct compat_timespec __user *, tp)
{
@@ -1221,7 +1229,8 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
return kc->nsleep(which_clock, flags, &t);
}

-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_32BIT_TIME
+
COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
struct compat_timespec __user *, rqtp,
struct compat_timespec __user *, rmtp)
@@ -1246,6 +1255,7 @@ COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,

return kc->nsleep(which_clock, flags, &t);
}
+
#endif

static const struct k_clock clock_realtime = {
--
2.14.1
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