Merge tag 'y2038-new-syscalls' of git://git.kernel.org:/pub/scm/linux/kernel/git/arnd/playground into timers/2038

Pull y2038 - time64 system calls from Arnd Bergmann:

This series finally gets us to the point of having system calls with 64-bit
time_t on all architectures, after a long time of incremental preparation
patches.

There was actually one conversion that I missed during the summer,
i.e. Deepa's timex series, which I now updated based the 5.0-rc1 changes
and review comments.

The following system calls are now added on all 32-bit architectures using
the same system call numbers:

403 clock_gettime64
404 clock_settime64
405 clock_adjtime64
406 clock_getres_time64
407 clock_nanosleep_time64
408 timer_gettime64
409 timer_settime64
410 timerfd_gettime64
411 timerfd_settime64
412 utimensat_time64
413 pselect6_time64
414 ppoll_time64
416 io_pgetevents_time64
417 recvmmsg_time64
418 mq_timedsend_time64
419 mq_timedreceiv_time64
420 semtimedop_time64
421 rt_sigtimedwait_time64
422 futex_time64
423 sched_rr_get_interval_time64

Each one of these corresponds directly to an existing system call that
includes a 'struct timespec' argument, or a structure containing a timespec
or (in case of clock_adjtime) timeval. Not included here are new versions
of getitimer/setitimer and getrusage/waitid, which are planned for the
future but only needed to make a consistent API rather than for correct
operation beyond y2038. These four system calls are based on 'timeval', and
it has not been finally decided what the replacement kernel interface will
use instead.

So far, I have done a lot of build testing across most architectures, which
has found a number of bugs. Runtime testing so far included testing LTP on
32-bit ARM with the existing system calls, to ensure we do not regress for
existing binaries, and a test with a 32-bit x86 build of LTP against a
modified version of the musl C library that has been adapted to the new
system call interface [3].  This library can be used for testing on all
architectures supported by musl-1.1.21, but it is not how the support is
getting integrated into the official musl release. Official musl support is
planned but will require more invasive changes to the library.

Link: https://lore.kernel.org/lkml/20190110162435.309262-1-arnd@arndb.de/T/
Link: https://lore.kernel.org/lkml/20190118161835.2259170-1-arnd@arndb.de/
Link: https://git.linaro.org/people/arnd/musl-y2038.git/ [2]

2 files changed, 47 insertions, 26 deletions

diff --git a/arch/xtensa/include/asm/unistd.h b/arch/xtensa/include/asm/unistd.h
index 81cc52ea1bd54..30af4dc3ce7b8 100644
--- a/arch/xtensa/include/asm/unistd.h
+++ b/arch/xtensa/include/asm/unistd.h
@@ -7,7 +7,7 @@
 
 #define __ARCH_WANT_NEW_STAT
 #define __ARCH_WANT_STAT64
-#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_UTIME32
 #define __ARCH_WANT_SYS_GETPGRP
 
 #define NR_syscalls				__NR_syscalls
diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
index c699e014e0dd0..6af49929de857 100644
--- a/arch/xtensa/kernel/syscalls/syscall.tbl
+++ b/arch/xtensa/kernel/syscalls/syscall.tbl
@@ -72,8 +72,8 @@
 61	common	fcntl64				sys_fcntl64
 62	common	fallocate			sys_fallocate
 63	common	fadvise64_64			xtensa_fadvise64_64
-64	common	utime				sys_utime
-65	common	utimes				sys_utimes
+64	common	utime				sys_utime32
+65	common	utimes				sys_utimes_time32
 66	common	ioctl				sys_ioctl
 67	common	fcntl				sys_fcntl
 68	common	setxattr			sys_setxattr
@@ -174,7 +174,7 @@
 158	common	capget				sys_capget
 159	common	capset				sys_capset
 160	common	ptrace				sys_ptrace
-161	common	semtimedop			sys_semtimedop
+161	common	semtimedop			sys_semtimedop_time32
 162	common	semget				sys_semget
 163	common	semop				sys_semop
 164	common	semctl				sys_old_semctl
@@ -206,11 +206,11 @@
 188	common	setrlimit			sys_setrlimit
 189	common	getrlimit			sys_getrlimit
 190	common	getrusage			sys_getrusage
-191	common	futex				sys_futex
+191	common	futex				sys_futex_time32
 192	common	gettimeofday			sys_gettimeofday
 193	common	settimeofday			sys_settimeofday
-194	common	adjtimex			sys_adjtimex
-195	common	nanosleep			sys_nanosleep
+194	common	adjtimex			sys_adjtimex_time32
+195	common	nanosleep			sys_nanosleep_time32
 196	common	getgroups			sys_getgroups
 197	common	setgroups			sys_setgroups
 198	common	sethostname			sys_sethostname
@@ -234,7 +234,7 @@
 215	common	sched_getscheduler		sys_sched_getscheduler
 216	common	sched_get_priority_max		sys_sched_get_priority_max
 217	common	sched_get_priority_min		sys_sched_get_priority_min
-218	common	sched_rr_get_interval		sys_sched_rr_get_interval
+218	common	sched_rr_get_interval		sys_sched_rr_get_interval_time32
 219	common	sched_yield			sys_sched_yield
 222	common	available222			sys_ni_syscall
 # Signal Handling
@@ -244,14 +244,14 @@
 226	common	rt_sigaction			sys_rt_sigaction
 227	common	rt_sigprocmask			sys_rt_sigprocmask
 228	common	rt_sigpending			sys_rt_sigpending
-229	common	rt_sigtimedwait			sys_rt_sigtimedwait
+229	common	rt_sigtimedwait			sys_rt_sigtimedwait_time32
 230	common	rt_sigqueueinfo			sys_rt_sigqueueinfo
 231	common	rt_sigsuspend			sys_rt_sigsuspend
 # Message
 232	common	mq_open				sys_mq_open
 233	common	mq_unlink			sys_mq_unlink
-234	common	mq_timedsend			sys_mq_timedsend
-235	common	mq_timedreceive			sys_mq_timedreceive
+234	common	mq_timedsend			sys_mq_timedsend_time32
+235	common	mq_timedreceive			sys_mq_timedreceive_time32
 236	common	mq_notify			sys_mq_notify
 237	common	mq_getsetattr			sys_mq_getsetattr
 238	common	available238			sys_ni_syscall
@@ -259,17 +259,17 @@
 # IO
 240	common	io_destroy			sys_io_destroy
 241	common	io_submit			sys_io_submit
-242	common	io_getevents			sys_io_getevents
+242	common	io_getevents			sys_io_getevents_time32
 243	common	io_cancel			sys_io_cancel
-244	common	clock_settime			sys_clock_settime
-245	common	clock_gettime			sys_clock_gettime
-246	common	clock_getres			sys_clock_getres
-247	common	clock_nanosleep			sys_clock_nanosleep
+244	common	clock_settime			sys_clock_settime32
+245	common	clock_gettime			sys_clock_gettime32
+246	common	clock_getres			sys_clock_getres_time32
+247	common	clock_nanosleep			sys_clock_nanosleep_time32
 # Timer
 248	common	timer_create			sys_timer_create
 249	common	timer_delete			sys_timer_delete
-250	common	timer_settime			sys_timer_settime
-251	common	timer_gettime			sys_timer_gettime
+250	common	timer_settime			sys_timer_settime32
+251	common	timer_gettime			sys_timer_gettime32
 252	common	timer_getoverrun		sys_timer_getoverrun
 # System
 253	common	reserved253			sys_ni_syscall
@@ -291,8 +291,8 @@
 269	common	tee				sys_tee
 270	common	vmsplice			sys_vmsplice
 271	common	available271			sys_ni_syscall
-272	common	pselect6			sys_pselect6
-273	common	ppoll				sys_ppoll
+272	common	pselect6			sys_pselect6_time32
+273	common	ppoll				sys_ppoll_time32
 274	common	epoll_pwait			sys_epoll_pwait
 275	common	epoll_create1			sys_epoll_create1
 276	common	inotify_init			sys_inotify_init
@@ -316,9 +316,9 @@
 293	common	linkat				sys_linkat
 294	common	symlinkat			sys_symlinkat
 295	common	readlinkat			sys_readlinkat
-296	common	utimensat			sys_utimensat
+296	common	utimensat			sys_utimensat_time32
 297	common	fchownat			sys_fchownat
-298	common	futimesat			sys_futimesat
+298	common	futimesat			sys_futimesat_time32
 299	common	fstatat64			sys_fstatat64
 300	common	fchmodat			sys_fchmodat
 301	common	faccessat			sys_faccessat
@@ -327,14 +327,14 @@
 304	common	signalfd			sys_signalfd
 # 305 was timerfd
 306	common	eventfd				sys_eventfd
-307	common	recvmmsg			sys_recvmmsg
+307	common	recvmmsg			sys_recvmmsg_time32
 308	common	setns				sys_setns
 309	common	signalfd4			sys_signalfd4
 310	common	dup3				sys_dup3
 311	common	pipe2				sys_pipe2
 312	common	timerfd_create			sys_timerfd_create
-313	common	timerfd_settime			sys_timerfd_settime
-314	common	timerfd_gettime			sys_timerfd_gettime
+313	common	timerfd_settime			sys_timerfd_settime32
+314	common	timerfd_gettime			sys_timerfd_gettime32
 315	common	available315			sys_ni_syscall
 316	common	eventfd2			sys_eventfd2
 317	common	preadv				sys_preadv
@@ -349,7 +349,7 @@
 326	common	sync_file_range2		sys_sync_file_range2
 327	common	perf_event_open			sys_perf_event_open
 328	common	rt_tgsigqueueinfo		sys_rt_tgsigqueueinfo
-329	common	clock_adjtime			sys_clock_adjtime
+329	common	clock_adjtime			sys_clock_adjtime32
 330	common	prlimit64			sys_prlimit64
 331	common	kcmp				sys_kcmp
 332	common	finit_module			sys_finit_module
@@ -373,3 +373,24 @@
 350	common	pkey_free			sys_pkey_free
 351	common	statx				sys_statx
 352	common	rseq				sys_rseq
+# 353 through 402 are unassigned to sync up with generic numbers
+403	common	clock_gettime64			sys_clock_gettime
+404	common	clock_settime64			sys_clock_settime
+405	common	clock_adjtime64			sys_clock_adjtime
+406	common	clock_getres_time64		sys_clock_getres
+407	common	clock_nanosleep_time64		sys_clock_nanosleep
+408	common	timer_gettime64			sys_timer_gettime
+409	common	timer_settime64			sys_timer_settime
+410	common	timerfd_gettime64		sys_timerfd_gettime
+411	common	timerfd_settime64		sys_timerfd_settime
+412	common	utimensat_time64		sys_utimensat
+413	common	pselect6_time64			sys_pselect6
+414	common	ppoll_time64			sys_ppoll
+416	common	io_pgetevents_time64		sys_io_pgetevents
+417	common	recvmmsg_time64			sys_recvmmsg
+418	common	mq_timedsend_time64		sys_mq_timedsend
+419	common	mq_timedreceive_time64		sys_mq_timedreceive
+420	common	semtimedop_time64		sys_semtimedop
+421	common	rt_sigtimedwait_time64		sys_rt_sigtimedwait
+422	common	futex_time64			sys_futex
+423	common	sched_rr_get_interval_time64	sys_sched_rr_get_interval