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compat: generic compat_sys_sched_rr_get_interval() implementation

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This function is used by sparc, powerpc tile and arm64 for compat support.
 The patch adds a generic implementation with a wrapper for PowerPC to do
the u32->int sign extension.

The reason for a single patch covering powerpc, tile, sparc and arm64 is
to keep it bisectable, otherwise kernel building may fail with mismatched
function declarations.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Chris Metcalf <cmetcalf@tilera.com>  [for tile]
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Catalin Marinas 2012-12-17 16:01:45 -08:00 committed by Linus Torvalds
parent 918854a65e
commit 0ad50c3896
12 changed files with 28 additions and 62 deletions
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1
arch/arm64/include/asm/unistd.h
View File

@ -20,6 +20,7 @@
#define __ARCH_WANT_SYS_GETPGRP
#define __ARCH_WANT_SYS_LLSEEK
#define __ARCH_WANT_SYS_NICE
#define __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
#define __ARCH_WANT_SYS_SIGPENDING
#define __ARCH_WANT_SYS_SIGPROCMASK
#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND

15
arch/arm64/kernel/sys_compat.c
View File

@ -28,21 +28,6 @@
#include <asm/cacheflush.h>
#include <asm/unistd32.h>
asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid,
struct compat_timespec __user *interval)
{
struct timespec t;
int ret;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
set_fs(old_fs);
if (put_compat_timespec(&t, interval))
return -EFAULT;
return ret;
}
static inline void
do_compat_cache_op(unsigned long start, unsigned long end, int flags)
{

2
arch/powerpc/include/asm/systbl.h
View File

@ -164,7 +164,7 @@ COMPAT_SYS_SPU(sched_getscheduler)
SYSCALL_SPU(sched_yield)
COMPAT_SYS_SPU(sched_get_priority_max)
COMPAT_SYS_SPU(sched_get_priority_min)
COMPAT_SYS_SPU(sched_rr_get_interval)
SYSX_SPU(sys_sched_rr_get_interval,compat_sys_sched_rr_get_interval_wrapper,sys_sched_rr_get_interval)
COMPAT_SYS_SPU(nanosleep)
SYSCALL_SPU(mremap)
SYSCALL_SPU(setresuid)

1
arch/powerpc/include/asm/unistd.h
View File

@ -54,6 +54,7 @@
#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_NEWFSTATAT
#define __ARCH_WANT_COMPAT_SYS_SENDFILE
#define __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
#endif
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_FORK

15
arch/powerpc/kernel/sys_ppc32.c
View File

@ -175,19 +175,10 @@ asmlinkage long compat_sys_prctl(u32 option, u32 arg2, u32 arg3, u32 arg4, u32 a
* proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
* and the register representation of a signed int (msr in 64-bit mode) is performed.
*/
asmlinkage long compat_sys_sched_rr_get_interval(u32 pid, struct compat_timespec __user *interval)
asmlinkage long compat_sys_sched_rr_get_interval_wrapper(u32 pid,
struct compat_timespec __user *interval)
{
struct timespec t;
int ret;
mm_segment_t old_fs = get_fs ();
/* The __user pointer cast is valid because of the set_fs() */
set_fs (KERNEL_DS);
ret = sys_sched_rr_get_interval((int)pid, (struct timespec __user *) &t);
set_fs (old_fs);
if (put_compat_timespec(&t, interval))
return -EFAULT;
return ret;
return compat_sys_sched_rr_get_interval((int)pid, interval);
}
/* Note: it is necessary to treat mode as an unsigned int,

1
arch/sparc/include/asm/unistd.h
View File

@ -45,6 +45,7 @@
#define __ARCH_WANT_COMPAT_SYS_TIME
#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_COMPAT_SYS_SENDFILE
#define __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
#endif
#define __ARCH_WANT_SYS_EXECVE

14
arch/sparc/kernel/sys_sparc32.c
View File

@ -211,20 +211,6 @@ asmlinkage long compat_sys_sysfs(int option, u32 arg1, u32 arg2)
return sys_sysfs(option, arg1, arg2);
}
asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval)
{
struct timespec t;
int ret;
mm_segment_t old_fs = get_fs ();
set_fs (KERNEL_DS);
ret = sys_sched_rr_get_interval(pid, (struct timespec __user *) &t);
set_fs (old_fs);
if (put_compat_timespec(&t, interval))
return -EFAULT;
return ret;
}
asmlinkage long compat_sys_rt_sigprocmask(int how,
compat_sigset_t __user *set,
compat_sigset_t __user *oset,

2
arch/tile/include/asm/compat.h
View File

@ -296,8 +296,6 @@ long compat_sys_sync_file_range2(int fd, unsigned int flags,
long compat_sys_fallocate(int fd, int mode,
u32 offset_lo, u32 offset_hi,
u32 len_lo, u32 len_hi);
long compat_sys_sched_rr_get_interval(compat_pid_t pid,
struct compat_timespec __user *interval);
/* Assembly trampoline to avoid clobbering r0. */
long _compat_sys_rt_sigreturn(void);

1
arch/tile/include/asm/unistd.h
View File

@ -14,6 +14,7 @@
/* In compat mode, we use sys_llseek() for compat_sys_llseek(). */
#ifdef CONFIG_COMPAT
#define __ARCH_WANT_SYS_LLSEEK
#define __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
#endif
#define __ARCH_WANT_SYS_NEWFSTATAT
#define __ARCH_WANT_SYS_EXECVE

18
arch/tile/kernel/compat.c
View File

@ -76,24 +76,6 @@ long compat_sys_fallocate(int fd, int mode,
((loff_t)len_hi << 32) | len_lo);
}
long compat_sys_sched_rr_get_interval(compat_pid_t pid,
struct compat_timespec __user *interval)
{
struct timespec t;
int ret;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_sched_rr_get_interval(pid,
(struct timespec __force __user *)&t);
set_fs(old_fs);
if (put_compat_timespec(&t, interval))
return -EFAULT;
return ret;
}
/* Provide the compat syscall number to call mapping. */
#undef __SYSCALL
#define __SYSCALL(nr, call) [nr] = (call),

3
include/linux/compat.h
View File

@ -588,6 +588,9 @@ asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
compat_off_t __user *offset, compat_size_t count);
asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
struct compat_timespec __user *interval);
#else
#define is_compat_task() (0)

17
kernel/compat.c
View File

@ -1215,6 +1215,23 @@ compat_sys_sysinfo(struct compat_sysinfo __user *info)
return 0;
}
#ifdef __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
struct compat_timespec __user *interval)
{
struct timespec t;
int ret;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
set_fs(old_fs);
if (put_compat_timespec(&t, interval))
return -EFAULT;
return ret;
}
#endif /* __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL */
/*
* Allocate user-space memory for the duration of a single system call,
* in order to marshall parameters inside a compat thunk.