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, 51 insertions, 30 deletions

diff --git a/arch/microblaze/include/asm/unistd.h b/arch/microblaze/include/asm/unistd.h
index 9b7c2c4eaf12..d79d35ac6253 100644
--- a/arch/microblaze/include/asm/unistd.h
+++ b/arch/microblaze/include/asm/unistd.h
@@ -21,8 +21,8 @@
 #define __ARCH_WANT_SYS_GETHOSTNAME
 #define __ARCH_WANT_SYS_PAUSE
 #define __ARCH_WANT_SYS_SIGNAL
-#define __ARCH_WANT_SYS_TIME
-#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_TIME32
+#define __ARCH_WANT_SYS_UTIME32
 #define __ARCH_WANT_SYS_WAITPID
 #define __ARCH_WANT_SYS_SOCKETCALL
 #define __ARCH_WANT_SYS_FADVISE64
diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
index 7cc0f9554da3..8ee3a8c18498 100644
--- a/arch/microblaze/kernel/syscalls/syscall.tbl
+++ b/arch/microblaze/kernel/syscalls/syscall.tbl
@@ -20,7 +20,7 @@
 10	common	unlink				sys_unlink
 11	common	execve				sys_execve
 12	common	chdir				sys_chdir
-13	common	time				sys_time
+13	common	time				sys_time32
 14	common	mknod				sys_mknod
 15	common	chmod				sys_chmod
 16	common	lchown				sys_lchown
@@ -32,12 +32,12 @@
 22	common	umount				sys_oldumount
 23	common	setuid				sys_setuid
 24	common	getuid				sys_getuid
-25	common	stime				sys_stime
+25	common	stime				sys_stime32
 26	common	ptrace				sys_ptrace
 27	common	alarm				sys_alarm
 28	common	oldfstat			sys_ni_syscall
 29	common	pause				sys_pause
-30	common	utime				sys_utime
+30	common	utime				sys_utime32
 31	common	stty				sys_ni_syscall
 32	common	gtty				sys_ni_syscall
 33	common	access				sys_access
@@ -131,7 +131,7 @@
 121	common	setdomainname			sys_setdomainname
 122	common	uname				sys_newuname
 123	common	modify_ldt			sys_ni_syscall
-124	common	adjtimex			sys_adjtimex
+124	common	adjtimex			sys_adjtimex_time32
 125	common	mprotect			sys_mprotect
 126	common	sigprocmask			sys_sigprocmask
 127	common	create_module			sys_ni_syscall
@@ -168,8 +168,8 @@
 158	common	sched_yield			sys_sched_yield
 159	common	sched_get_priority_max		sys_sched_get_priority_max
 160	common	sched_get_priority_min		sys_sched_get_priority_min
-161	common	sched_rr_get_interval		sys_sched_rr_get_interval
-162	common	nanosleep			sys_nanosleep
+161	common	sched_rr_get_interval		sys_sched_rr_get_interval_time32
+162	common	nanosleep			sys_nanosleep_time32
 163	common	mremap				sys_mremap
 164	common	setresuid			sys_setresuid
 165	common	getresuid			sys_getresuid
@@ -184,7 +184,7 @@
 174	common	rt_sigaction			sys_rt_sigaction
 175	common	rt_sigprocmask			sys_rt_sigprocmask
 176	common	rt_sigpending			sys_rt_sigpending
-177	common	rt_sigtimedwait			sys_rt_sigtimedwait
+177	common	rt_sigtimedwait			sys_rt_sigtimedwait_time32
 178	common	rt_sigqueueinfo			sys_rt_sigqueueinfo
 179	common	rt_sigsuspend			sys_rt_sigsuspend
 180	common	pread64				sys_pread64
@@ -247,14 +247,14 @@
 237	common	fremovexattr			sys_fremovexattr
 238	common	tkill				sys_tkill
 239	common	sendfile64			sys_sendfile64
-240	common	futex				sys_futex
+240	common	futex				sys_futex_time32
 241	common	sched_setaffinity		sys_sched_setaffinity
 242	common	sched_getaffinity		sys_sched_getaffinity
 243	common	set_thread_area			sys_ni_syscall
 244	common	get_thread_area			sys_ni_syscall
 245	common	io_setup			sys_io_setup
 246	common	io_destroy			sys_io_destroy
-247	common	io_getevents			sys_io_getevents
+247	common	io_getevents			sys_io_getevents_time32
 248	common	io_submit			sys_io_submit
 249	common	io_cancel			sys_io_cancel
 250	common	fadvise64			sys_fadvise64
@@ -267,18 +267,18 @@
 257	common	remap_file_pages		sys_remap_file_pages
 258	common	set_tid_address			sys_set_tid_address
 259	common	timer_create			sys_timer_create
-260	common	timer_settime			sys_timer_settime
-261	common	timer_gettime			sys_timer_gettime
+260	common	timer_settime			sys_timer_settime32
+261	common	timer_gettime			sys_timer_gettime32
 262	common	timer_getoverrun		sys_timer_getoverrun
 263	common	timer_delete			sys_timer_delete
-264	common	clock_settime			sys_clock_settime
-265	common	clock_gettime			sys_clock_gettime
-266	common	clock_getres			sys_clock_getres
-267	common	clock_nanosleep			sys_clock_nanosleep
+264	common	clock_settime			sys_clock_settime32
+265	common	clock_gettime			sys_clock_gettime32
+266	common	clock_getres			sys_clock_getres_time32
+267	common	clock_nanosleep			sys_clock_nanosleep_time32
 268	common	statfs64			sys_statfs64
 269	common	fstatfs64			sys_fstatfs64
 270	common	tgkill				sys_tgkill
-271	common	utimes				sys_utimes
+271	common	utimes				sys_utimes_time32
 272	common	fadvise64_64			sys_fadvise64_64
 273	common	vserver				sys_ni_syscall
 274	common	mbind				sys_mbind
@@ -286,8 +286,8 @@
 276	common	set_mempolicy			sys_set_mempolicy
 277	common	mq_open				sys_mq_open
 278	common	mq_unlink			sys_mq_unlink
-279	common	mq_timedsend			sys_mq_timedsend
-280	common	mq_timedreceive			sys_mq_timedreceive
+279	common	mq_timedsend			sys_mq_timedsend_time32
+280	common	mq_timedreceive			sys_mq_timedreceive_time32
 281	common	mq_notify			sys_mq_notify
 282	common	mq_getsetattr			sys_mq_getsetattr
 283	common	kexec_load			sys_kexec_load
@@ -306,7 +306,7 @@
 296	common	mkdirat				sys_mkdirat
 297	common	mknodat				sys_mknodat
 298	common	fchownat			sys_fchownat
-299	common	futimesat			sys_futimesat
+299	common	futimesat			sys_futimesat_time32
 300	common	fstatat64			sys_fstatat64
 301	common	unlinkat			sys_unlinkat
 302	common	renameat			sys_renameat
@@ -315,8 +315,8 @@
 305	common	readlinkat			sys_readlinkat
 306	common	fchmodat			sys_fchmodat
 307	common	faccessat			sys_faccessat
-308	common	pselect6			sys_pselect6
-309	common	ppoll				sys_ppoll
+308	common	pselect6			sys_pselect6_time32
+309	common	ppoll				sys_ppoll_time32
 310	common	unshare				sys_unshare
 311	common	set_robust_list			sys_set_robust_list
 312	common	get_robust_list			sys_get_robust_list
@@ -327,14 +327,14 @@
 317	common	move_pages			sys_move_pages
 318	common	getcpu				sys_getcpu
 319	common	epoll_pwait			sys_epoll_pwait
-320	common	utimensat			sys_utimensat
+320	common	utimensat			sys_utimensat_time32
 321	common	signalfd			sys_signalfd
 322	common	timerfd_create			sys_timerfd_create
 323	common	eventfd				sys_eventfd
 324	common	fallocate			sys_fallocate
-325	common	semtimedop			sys_semtimedop
-326	common	timerfd_settime			sys_timerfd_settime
-327	common	timerfd_gettime			sys_timerfd_gettime
+325	common	semtimedop			sys_semtimedop_time32
+326	common	timerfd_settime			sys_timerfd_settime32
+327	common	timerfd_gettime			sys_timerfd_gettime32
 328	common	semctl				sys_old_semctl
 329	common	semget				sys_semget
 330	common	semop				sys_semop
@@ -374,13 +374,13 @@
 364	common	pwritev				sys_pwritev
 365	common	rt_tgsigqueueinfo		sys_rt_tgsigqueueinfo
 366	common	perf_event_open			sys_perf_event_open
-367	common	recvmmsg			sys_recvmmsg
+367	common	recvmmsg			sys_recvmmsg_time32
 368	common	fanotify_init			sys_fanotify_init
 369	common	fanotify_mark			sys_fanotify_mark
 370	common	prlimit64			sys_prlimit64
 371	common	name_to_handle_at		sys_name_to_handle_at
 372	common	open_by_handle_at		sys_open_by_handle_at
-373	common	clock_adjtime			sys_clock_adjtime
+373	common	clock_adjtime			sys_clock_adjtime32
 374	common	syncfs				sys_syncfs
 375	common	setns				sys_setns
 376	common	sendmmsg			sys_sendmmsg
@@ -406,5 +406,26 @@
 396	common	pkey_alloc			sys_pkey_alloc
 397	common	pkey_free			sys_pkey_free
 398	common	statx				sys_statx
-399	common	io_pgetevents			sys_io_pgetevents
+399	common	io_pgetevents			sys_io_pgetevents_time32
 400	common	rseq				sys_rseq
+# 401 and 402 are unused
+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