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y2038: Remove stat64 family from default syscall set

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New architectures should no longer need stat64, which is not y2038
safe and has been replaced by statx(). This removes the 'select
__ARCH_WANT_STAT64' statement from asm-generic/unistd.h and instead
moves it into the respective asm/unistd.h UAPI header files for each
architecture that uses it today.

In the generic file, the system call number and entry points are now
made conditional, so newly added architectures (e.g. riscv32 or csky)
will never need to carry backwards compatiblity for it.

arm64 is the only 64-bit architecture using the asm-generic/unistd.h
file, and it already sets __ARCH_WANT_NEW_STAT in its headers, and I
use the same #ifdef here: future 64-bit architectures therefore won't
see newstat or stat64 any more. They don't suffer from the y2038 time_t
overflow, but for consistency it seems best to also let them use statx().

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2018-04-13 12:19:47 +02:00
parent 82b355d161
commit bf4b6a7d37
10 changed files with 10 additions and 1 deletions
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1
arch/arc/include/uapi/asm/unistd.h
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@ -17,6 +17,7 @@
#define _UAPI_ASM_ARC_UNISTD_H
#define __ARCH_WANT_RENAMEAT
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_CLONE
#define __ARCH_WANT_SYS_VFORK

1
arch/c6x/include/uapi/asm/unistd.h
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@ -16,6 +16,7 @@
*/
#define __ARCH_WANT_RENAMEAT
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_CLONE
/* Use the standard ABI for syscalls. */

1
arch/h8300/include/uapi/asm/unistd.h
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@ -1,5 +1,6 @@
#define __ARCH_NOMMU
#define __ARCH_WANT_RENAMEAT
#define __ARCH_WANT_STAT64
#include <asm-generic/unistd.h>

1
arch/hexagon/include/uapi/asm/unistd.h
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@ -29,6 +29,7 @@
#define sys_mmap2 sys_mmap_pgoff
#define __ARCH_WANT_RENAMEAT
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_CLONE
#define __ARCH_WANT_SYS_VFORK

1
arch/nds32/include/uapi/asm/unistd.h
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@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2005-2017 Andes Technology Corporation
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYNC_FILE_RANGE2
/* Use the standard ABI for syscalls */

1
arch/nios2/include/uapi/asm/unistd.h
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@ -19,6 +19,7 @@
#define sys_mmap2 sys_mmap_pgoff
#define __ARCH_WANT_RENAMEAT
#define __ARCH_WANT_STAT64
/* Use the standard ABI for syscalls */
#include <asm-generic/unistd.h>

1
arch/openrisc/include/uapi/asm/unistd.h
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@ -20,6 +20,7 @@
#define sys_mmap2 sys_mmap_pgoff
#define __ARCH_WANT_RENAMEAT
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_CLONE

1
arch/unicore32/include/uapi/asm/unistd.h
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@ -15,4 +15,5 @@
/* Use the standard ABI for syscalls. */
#include <asm-generic/unistd.h>
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_CLONE

1
include/asm-generic/unistd.h
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@ -8,6 +8,5 @@
* be selected by default.
*/
#if __BITS_PER_LONG == 32
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_LLSEEK
#endif

2
include/uapi/asm-generic/unistd.h
View File

@ -242,10 +242,12 @@ __SYSCALL(__NR_tee, sys_tee)
/* fs/stat.c */
#define __NR_readlinkat 78
__SYSCALL(__NR_readlinkat, sys_readlinkat)
#if defined(__ARCH_WANT_NEW_STAT) || defined(__ARCH_WANT_STAT64)
#define __NR3264_fstatat 79
__SC_3264(__NR3264_fstatat, sys_fstatat64, sys_newfstatat)
#define __NR3264_fstat 80
__SC_3264(__NR3264_fstat, sys_fstat64, sys_newfstat)
#endif
/* fs/sync.c */
#define __NR_sync 81