sysctl: s390 Use the compat_sys_sysctl

Now that we have a generic 32bit compatibility implementation
there is no need for s390 to implement it's own.

Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

3 files changed, 2 insertions, 59 deletions

diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index 0debcec23a39..fda1a8123f9b 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/arch/s390/kernel/compat_linux.c
@@ -527,59 +527,6 @@ asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
         return ret;
 }
 
-#ifdef CONFIG_SYSCTL_SYSCALL
-struct __sysctl_args32 {
-        u32 name;
-        int nlen;
-        u32 oldval;
-        u32 oldlenp;
-        u32 newval;
-        u32 newlen;
-        u32 __unused[4];
-};
-
-asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
-{
-        struct __sysctl_args32 tmp;
-        int error;
-        size_t oldlen;
-        size_t __user *oldlenp = NULL;
-        unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
-
-        if (copy_from_user(&tmp, args, sizeof(tmp)))
-                return -EFAULT;
-
-        if (tmp.oldval && tmp.oldlenp) {
-                /* Duh, this is ugly and might not work if sysctl_args
-                   is in read-only memory, but do_sysctl does indirectly
-                   a lot of uaccess in both directions and we'd have to
-                   basically copy the whole sysctl.c here, and
-                   glibc's __sysctl uses rw memory for the structure
-                   anyway.  */
-                if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
-                    put_user(oldlen, (size_t __user *)addr))
-                        return -EFAULT;
-                oldlenp = (size_t __user *)addr;
-        }
-
-        lock_kernel();
-        error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
-                          oldlenp, compat_ptr(tmp.newval), tmp.newlen);
-        unlock_kernel();
-        if (oldlenp) {
-                if (!error) {
-                        if (get_user(oldlen, (size_t __user *)addr) ||
-                            put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
-                                error = -EFAULT;
-                }
-                if (copy_to_user(args->__unused, tmp.__unused,
-                                 sizeof(tmp.__unused)))
-                        error = -EFAULT;
-        }
-        return error;
-}
-#endif
-
 struct stat64_emu31 {
         unsigned long long  st_dev;
         unsigned int    __pad1;
diff --git a/arch/s390/kernel/compat_linux.h b/arch/s390/kernel/compat_linux.h
index c07f9ca05ade..45e9092b3aad 100644
--- a/arch/s390/kernel/compat_linux.h
+++ b/arch/s390/kernel/compat_linux.h
@@ -162,7 +162,6 @@ struct ucontext32 {
         compat_sigset_t         uc_sigmask;     /* mask last for extensibility */
 };
 
-struct __sysctl_args32;
 struct stat64_emu31;
 struct mmap_arg_struct_emu31;
 struct fadvise64_64_args;
@@ -212,7 +211,6 @@ long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset,
                     size_t count);
 long sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset,
                       s32 count);
-long sys32_sysctl(struct __sysctl_args32 __user *args);
 long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf);
 long sys32_lstat64(char __user * filename,
                    struct stat64_emu31 __user * statbuf);
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index cbd9901dc0f8..30de2d0e52bb 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -689,8 +689,6 @@ sys32_fdatasync_wrapper:
         llgfr   %r2,%r2                 # unsigned int
         jg      sys_fdatasync           # branch to system call
 
-#sys32_sysctl_wrapper                   # tbd
-
         .globl  sys32_mlock_wrapper
 sys32_mlock_wrapper:
         llgfr   %r2,%r2                 # unsigned long
@@ -1087,8 +1085,8 @@ sys32_stime_wrapper:
 
         .globl  sys32_sysctl_wrapper
 sys32_sysctl_wrapper:
-        llgtr   %r2,%r2                 # struct __sysctl_args32 *
-        jg      sys32_sysctl
+        llgtr   %r2,%r2                 # struct compat_sysctl_args *
+        jg      compat_sys_sysctl
 
         .globl  sys32_fstat64_wrapper
 sys32_fstat64_wrapper: