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, 48 insertions, 28 deletions

diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h
index 49d5de18646b3..2e0047cf86f83 100644
--- a/arch/m68k/include/asm/unistd.h
+++ b/arch/m68k/include/asm/unistd.h
@@ -15,8 +15,8 @@
 #define __ARCH_WANT_SYS_IPC
 #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/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
index bffffb202f8af..125c14178979c 100644
--- a/arch/m68k/kernel/syscalls/syscall.tbl
+++ b/arch/m68k/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	chown				sys_chown16
@@ -32,12 +32,12 @@
 22	common	umount				sys_oldumount
 23	common	setuid				sys_setuid16
 24	common	getuid				sys_getuid16
-25	common	stime				sys_stime
+25	common	stime				sys_stime32
 26	common	ptrace				sys_ptrace
 27	common	alarm				sys_alarm
 28	common	oldfstat			sys_fstat
 29	common	pause				sys_pause
-30	common	utime				sys_utime
+30	common	utime				sys_utime32
 # 31 was stty
 # 32 was gtty
 33	common	access				sys_access
@@ -131,7 +131,7 @@
 121	common	setdomainname			sys_setdomainname
 122	common	uname				sys_newuname
 123	common	cacheflush			sys_cacheflush
-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_setresuid16
 165	common	getresuid			sys_getresuid16
@@ -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
@@ -242,7 +242,7 @@
 232	common	removexattr			sys_removexattr
 233	common	lremovexattr			sys_lremovexattr
 234	common	fremovexattr			sys_fremovexattr
-235	common	futex				sys_futex
+235	common	futex				sys_futex_time32
 236	common	sendfile64			sys_sendfile64
 237	common	mincore				sys_mincore
 238	common	madvise				sys_madvise
@@ -250,7 +250,7 @@
 240	common	readahead			sys_readahead
 241	common	io_setup			sys_io_setup
 242	common	io_destroy			sys_io_destroy
-243	common	io_getevents			sys_io_getevents
+243	common	io_getevents			sys_io_getevents_time32
 244	common	io_submit			sys_io_submit
 245	common	io_cancel			sys_io_cancel
 246	common	fadvise64			sys_fadvise64
@@ -262,26 +262,26 @@
 252	common	remap_file_pages		sys_remap_file_pages
 253	common	set_tid_address			sys_set_tid_address
 254	common	timer_create			sys_timer_create
-255	common	timer_settime			sys_timer_settime
-256	common	timer_gettime			sys_timer_gettime
+255	common	timer_settime			sys_timer_settime32
+256	common	timer_gettime			sys_timer_gettime32
 257	common	timer_getoverrun		sys_timer_getoverrun
 258	common	timer_delete			sys_timer_delete
-259	common	clock_settime			sys_clock_settime
-260	common	clock_gettime			sys_clock_gettime
-261	common	clock_getres			sys_clock_getres
-262	common	clock_nanosleep			sys_clock_nanosleep
+259	common	clock_settime			sys_clock_settime32
+260	common	clock_gettime			sys_clock_gettime32
+261	common	clock_getres			sys_clock_getres_time32
+262	common	clock_nanosleep			sys_clock_nanosleep_time32
 263	common	statfs64			sys_statfs64
 264	common	fstatfs64			sys_fstatfs64
 265	common	tgkill				sys_tgkill
-266	common	utimes				sys_utimes
+266	common	utimes				sys_utimes_time32
 267	common	fadvise64_64			sys_fadvise64_64
 268	common	mbind				sys_mbind
 269	common	get_mempolicy			sys_get_mempolicy
 270	common	set_mempolicy			sys_set_mempolicy
 271	common	mq_open				sys_mq_open
 272	common	mq_unlink			sys_mq_unlink
-273	common	mq_timedsend			sys_mq_timedsend
-274	common	mq_timedreceive			sys_mq_timedreceive
+273	common	mq_timedsend			sys_mq_timedsend_time32
+274	common	mq_timedreceive			sys_mq_timedreceive_time32
 275	common	mq_notify			sys_mq_notify
 276	common	mq_getsetattr			sys_mq_getsetattr
 277	common	waitid				sys_waitid
@@ -299,7 +299,7 @@
 289	common	mkdirat				sys_mkdirat
 290	common	mknodat				sys_mknodat
 291	common	fchownat			sys_fchownat
-292	common	futimesat			sys_futimesat
+292	common	futimesat			sys_futimesat_time32
 293	common	fstatat64			sys_fstatat64
 294	common	unlinkat			sys_unlinkat
 295	common	renameat			sys_renameat
@@ -308,8 +308,8 @@
 298	common	readlinkat			sys_readlinkat
 299	common	fchmodat			sys_fchmodat
 300	common	faccessat			sys_faccessat
-301	common	pselect6			sys_pselect6
-302	common	ppoll				sys_ppoll
+301	common	pselect6			sys_pselect6_time32
+302	common	ppoll				sys_ppoll_time32
 303	common	unshare				sys_unshare
 304	common	set_robust_list			sys_set_robust_list
 305	common	get_robust_list			sys_get_robust_list
@@ -323,13 +323,13 @@
 313	common	kexec_load			sys_kexec_load
 314	common	getcpu				sys_getcpu
 315	common	epoll_pwait			sys_epoll_pwait
-316	common	utimensat			sys_utimensat
+316	common	utimensat			sys_utimensat_time32
 317	common	signalfd			sys_signalfd
 318	common	timerfd_create			sys_timerfd_create
 319	common	eventfd				sys_eventfd
 320	common	fallocate			sys_fallocate
-321	common	timerfd_settime			sys_timerfd_settime
-322	common	timerfd_gettime			sys_timerfd_gettime
+321	common	timerfd_settime			sys_timerfd_settime32
+322	common	timerfd_gettime			sys_timerfd_gettime32
 323	common	signalfd4			sys_signalfd4
 324	common	eventfd2			sys_eventfd2
 325	common	epoll_create1			sys_epoll_create1
@@ -349,7 +349,7 @@
 339	common	prlimit64			sys_prlimit64
 340	common	name_to_handle_at		sys_name_to_handle_at
 341	common	open_by_handle_at		sys_open_by_handle_at
-342	common	clock_adjtime			sys_clock_adjtime
+342	common	clock_adjtime			sys_clock_adjtime32
 343	common	syncfs				sys_syncfs
 344	common	setns				sys_setns
 345	common	process_vm_readv		sys_process_vm_readv
@@ -378,7 +378,7 @@
 368	common	recvfrom			sys_recvfrom
 369	common	recvmsg				sys_recvmsg
 370	common	shutdown			sys_shutdown
-371	common	recvmmsg			sys_recvmmsg
+371	common	recvmmsg			sys_recvmmsg_time32
 372	common	sendmmsg			sys_sendmmsg
 373	common	userfaultfd			sys_userfaultfd
 374	common	membarrier			sys_membarrier
@@ -403,3 +403,23 @@
 400	common	msgsnd				sys_msgsnd
 401	common	msgrcv				sys_msgrcv
 402	common	msgctl				sys_msgctl
+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