compat: generic compat_sys_sched_rr_get_interval implementation

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>

diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
index b40dc6b69848a0753cecbbd77f38573a86863b1c..d7cdf14463b72233fcb267abb113769da60112a5 100644 (file)
--- a/arch/arm64/include/asm/unistd.h
+++ b/arch/arm64/include/asm/unistd.h
@@ -25,6 +25,7 @@
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #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
 #include <uapi/asm/unistd.h>

diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c
index d140b73a8bc419e64f866dd10fd17b94d2d045f2..d916bafbbad224a9acb0c9269bf47e394a879f45 100644 (file)
--- a/arch/arm64/kernel/sys_compat.c
+++ b/arch/arm64/kernel/sys_compat.c
@@ -49,21 +49,6 @@ asmlinkage int compat_sys_vfork(struct pt_regs *regs)
                       regs, 0, NULL, NULL);
 }
 
-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)
 {

diff --git a/arch/powerpc/include/asm/systbl.h b/arch/powerpc/include/asm/systbl.h
index 840838769853e653f1ee950d9fdb4ed619f54ede..cec8aae5cbf8a85fc0f7db35734222e287e7cd48 100644 (file)
--- a/arch/powerpc/include/asm/systbl.h
+++ b/arch/powerpc/include/asm/systbl.h
@@ -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)

diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index 280068cfff2e8721e39e4582277de4670bd09793..5240ed00dc1ae786e93ab38e2de306ac2e40b8d9 100644 (file)
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -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
 

diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c
index 9c2ed90ece8f4cdb93b75456f70376b944d52703..8a93778ed9f5ac86178d0e8a397acefc8a55a729 100644 (file)
--- a/arch/powerpc/kernel/sys_ppc32.c
+++ b/arch/powerpc/kernel/sys_ppc32.c
@@ -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)
-{
-       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;
+asmlinkage long compat_sys_sched_rr_get_interval_wrapper(u32 pid,
+                                                        struct compat_timespec __user *interval)
+{
+       return compat_sys_sched_rr_get_interval((int)pid, interval);
 }
 
 /* Note: it is necessary to treat mode as an unsigned int,

diff --git a/arch/sparc/include/asm/unistd.h b/arch/sparc/include/asm/unistd.h
index c3e5d8b6417123b19ff0383abb063d85d82db243..497386a7ed28d754e5efcc2a5c9d530e8cb56142 100644 (file)
--- a/arch/sparc/include/asm/unistd.h
+++ b/arch/sparc/include/asm/unistd.h
@@ -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
 

diff --git a/arch/sparc/kernel/sys_sparc32.c b/arch/sparc/kernel/sys_sparc32.c
index 03c7e929ec34d41eedd7fad7378795c806be5081..4a4cdc633f6b84453748042cbd6fb19129f62d88 100644 (file)
--- a/arch/sparc/kernel/sys_sparc32.c
+++ b/arch/sparc/kernel/sys_sparc32.c
@@ -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,

diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h
index 3063e6fc8daaa0dd3dd982a857889ffec74f451e..06568a9dc48f7bf1891d88effe490bf5a201db6d 100644 (file)
--- a/arch/tile/include/asm/compat.h
+++ b/arch/tile/include/asm/compat.h
@@ -300,8 +300,6 @@ 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);
 
 /* These are the intvec_64.S trampolines. */
 long _compat_sys_execve(const char __user *path,

diff --git a/arch/tile/include/asm/unistd.h b/arch/tile/include/asm/unistd.h
index 6e032a0a268eebeacb8c04b4fb1f17f1da0bbcd3..359b45bd0f9da068b5c7fccf6e538ac7ef9dcc77 100644 (file)
--- a/arch/tile/include/asm/unistd.h
+++ b/arch/tile/include/asm/unistd.h
@@ -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
 #include <uapi/asm/unistd.h>

diff --git a/arch/tile/kernel/compat.c b/arch/tile/kernel/compat.c
index d67459b9ac2aa43f4c44eb50125c0143509e873f..ef5ab9d3178d19ac32c0f17e5dd49758b2449294 100644 (file)
--- a/arch/tile/kernel/compat.c
+++ b/arch/tile/kernel/compat.c
@@ -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),

diff --git a/include/linux/compat.h b/include/linux/compat.h
index d0ced1011f2fa28cf96087880d6cddda011de13f..30840c5b6b8f31ccaac83c39ebab436a63380874 100644 (file)
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -592,6 +592,9 @@ 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)

diff --git a/kernel/compat.c b/kernel/compat.c
index c28a306ae05c069bbd11f107438459c106c5dc59..f6150e92dfc9366488ce45a2b91e98b9fbd7e150 100644 (file)
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -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.