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

Pull preparatory work for y2038 changes from Arnd Bergmann:

System call unification and cleanup

The system call tables have diverged a bit over the years, and a number of
the recent additions never made it into all architectures, for one reason
or another.

This is an attempt to clean it up as far as we can without breaking
compatibility, doing a number of steps:

 - Add system calls that have not yet been integrated into all architectures
   but that we definitely want there. This includes {,f}statfs64() and
   get{eg,eu,g,p,u,pp}id() on alpha, which have been missing traditionally.

 - The s390 compat syscall handling is cleaned up to be more like what we
   do on other architectures, while keeping the 31-bit pointer
   extension. This was merged as a shared branch by the s390 maintainers
   and is included here in order to base the other patches on top.

 - Add the separate ipc syscalls on all architectures that traditionally
   only had sys_ipc(). This version is done without support for IPC_OLD
   that is we have in sys_ipc. The new semtimedop_time64 syscall will only
   be added here, not in sys_ipc

 - Add syscall numbers for a couple of syscalls that we probably don't need
   everywhere, in particular pkey_* and rseq, for the purpose of symmetry:
   if it's in asm-generic/unistd.h, it makes sense to have it everywhere. I
   expect that any future system calls will get assigned on all platforms
   together, even when they appear to be specific to a single architecture.

 - Prepare for having the same system call numbers for any future calls. In
   combination with the generated tables, this hopefully makes it easier to
   add new calls across all architectures together.

All of the above are technically separate from the y2038 work, but are done
as preparation before we add the new 64-bit time_t system calls everywhere,
providing a common baseline set of system calls.

I expect that glibc and other libraries that want to use 64-bit time_t will
require linux-5.1 kernel headers for building in the future, and at a much
later point may also require linux-5.1 or a later version as the minimum
kernel at runtime. Having a common baseline then allows the removal of many
architecture or kernel version specific workarounds.

arch/mips/include/asm/unistd.h

@@ -54,20 +54,7 @@
 #define __ARCH_WANT_SYS_CLONE
 
 /* whitelists for checksyscalls */
-#define __IGNORE_select
-#define __IGNORE_vfork
-#define __IGNORE_time
-#define __IGNORE_uselib
 #define __IGNORE_fadvise64_64
-#define __IGNORE_getdents64
-#if _MIPS_SIM == _MIPS_SIM_NABI32
-#define __IGNORE_truncate64
-#define __IGNORE_ftruncate64
-#define __IGNORE_stat64
-#define __IGNORE_lstat64
-#define __IGNORE_fstat64
-#define __IGNORE_fstatat64
-#endif
 
 #endif /* !__ASSEMBLY__ */
 

arch/mips/kernel/syscalls/syscall_n32.tbl

@@ -37,7 +37,7 @@
 27	n32	madvise				sys_madvise
 28	n32	shmget				sys_shmget
 29	n32	shmat				sys_shmat
-30	n32	shmctl				compat_sys_shmctl
+30	n32	shmctl				compat_sys_old_shmctl
 31	n32	dup				sys_dup
 32	n32	dup2				sys_dup2
 33	n32	pause				sys_pause
@@ -71,12 +71,12 @@
 61	n32	uname				sys_newuname
 62	n32	semget				sys_semget
 63	n32	semop				sys_semop
-64	n32	semctl				compat_sys_semctl
+64	n32	semctl				compat_sys_old_semctl
 65	n32	shmdt				sys_shmdt
 66	n32	msgget				sys_msgget
 67	n32	msgsnd				compat_sys_msgsnd
 68	n32	msgrcv				compat_sys_msgrcv
-69	n32	msgctl				compat_sys_msgctl
+69	n32	msgctl				compat_sys_old_msgctl
 70	n32	fcntl				compat_sys_fcntl
 71	n32	flock				sys_flock
 72	n32	fsync				sys_fsync

arch/mips/kernel/syscalls/syscall_n64.tbl

@@ -37,7 +37,7 @@
 27	n64	madvise				sys_madvise
 28	n64	shmget				sys_shmget
 29	n64	shmat				sys_shmat
-30	n64	shmctl				sys_shmctl
+30	n64	shmctl				sys_old_shmctl
 31	n64	dup				sys_dup
 32	n64	dup2				sys_dup2
 33	n64	pause				sys_pause
@@ -71,12 +71,12 @@
 61	n64	uname				sys_newuname
 62	n64	semget				sys_semget
 63	n64	semop				sys_semop
-64	n64	semctl				sys_semctl
+64	n64	semctl				sys_old_semctl
 65	n64	shmdt				sys_shmdt
 66	n64	msgget				sys_msgget
 67	n64	msgsnd				sys_msgsnd
 68	n64	msgrcv				sys_msgrcv
-69	n64	msgctl				sys_msgctl
+69	n64	msgctl				sys_old_msgctl
 70	n64	fcntl				sys_fcntl
 71	n64	flock				sys_flock
 72	n64	fsync				sys_fsync

arch/mips/kernel/syscalls/syscall_o32.tbl

@@ -380,3 +380,14 @@
 366	o32	statx				sys_statx
 367	o32	rseq				sys_rseq
 368	o32	io_pgetevents			sys_io_pgetevents		compat_sys_io_pgetevents
+# room for arch specific calls
+393	o32	semget				sys_semget
+394	o32	semctl				sys_semctl			compat_sys_semctl
+395	o32	shmget				sys_shmget
+396	o32	shmctl				sys_shmctl			compat_sys_shmctl
+397	o32	shmat				sys_shmat			compat_sys_shmat
+398	o32	shmdt				sys_shmdt
+399	o32	msgget				sys_msgget
+400	o32	msgsnd				sys_msgsnd			compat_sys_msgsnd
+401	o32	msgrcv				sys_msgrcv			compat_sys_msgrcv
+402	o32	msgctl				sys_msgctl			compat_sys_msgctl