[PATCH] Common compat_sys_sysinfo

I noticed that almost all architectures implemented exactly the same
sys32_sysinfo...  except parisc, where a bug was to be found in handling of
the uptime.  So let's remove a whole whack of code for fun and profit.
Cribbed compat_sys_sysinfo from x86_64's implementation, since I figured it
would be the best tested.

This patch incorporates Arnd's suggestion of not using set_fs/get_fs, but
instead extracting out the common code from sys_sysinfo.

Cc: Christoph Hellwig <hch@infradead.org>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 1 insertions, 65 deletions

diff --git a/arch/parisc/kernel/sys_parisc32.c b/arch/parisc/kernel/sys_parisc32.c
index 29be4377aca6..ce3245f87fdd 100644
--- a/arch/parisc/kernel/sys_parisc32.c
+++ b/arch/parisc/kernel/sys_parisc32.c
@@ -579,70 +579,6 @@ asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *off
 }
 
 
-struct sysinfo32 {
-        s32 uptime;
-        u32 loads[3];
-        u32 totalram;
-        u32 freeram;
-        u32 sharedram;
-        u32 bufferram;
-        u32 totalswap;
-        u32 freeswap;
-        unsigned short procs;
-        u32 totalhigh;
-        u32 freehigh;
-        u32 mem_unit;
-        char _f[12];
-};
-
-/* We used to call sys_sysinfo and translate the result.  But sys_sysinfo
- * undoes the good work done elsewhere, and rather than undoing the
- * damage, I decided to just duplicate the code from sys_sysinfo here.
- */
-
-asmlinkage int sys32_sysinfo(struct sysinfo32 __user *info)
-{
-        struct sysinfo val;
-        int err;
-        unsigned long seq;
-
-        /* We don't need a memset here because we copy the
-         * struct to userspace once element at a time.
-         */
-
-        do {
-                seq = read_seqbegin(&xtime_lock);
-                val.uptime = jiffies / HZ;
-
-                val.loads[0] = avenrun[0] << (SI_LOAD_SHIFT - FSHIFT);
-                val.loads[1] = avenrun[1] << (SI_LOAD_SHIFT - FSHIFT);
-                val.loads[2] = avenrun[2] << (SI_LOAD_SHIFT - FSHIFT);
-
-                val.procs = nr_threads;
-        } while (read_seqretry(&xtime_lock, seq));
-
-
-        si_meminfo(&val);
-        si_swapinfo(&val);
-        
-        err = put_user (val.uptime, &info->uptime);
-        err |= __put_user (val.loads[0], &info->loads[0]);
-        err |= __put_user (val.loads[1], &info->loads[1]);
-        err |= __put_user (val.loads[2], &info->loads[2]);
-        err |= __put_user (val.totalram, &info->totalram);
-        err |= __put_user (val.freeram, &info->freeram);
-        err |= __put_user (val.sharedram, &info->sharedram);
-        err |= __put_user (val.bufferram, &info->bufferram);
-        err |= __put_user (val.totalswap, &info->totalswap);
-        err |= __put_user (val.freeswap, &info->freeswap);
-        err |= __put_user (val.procs, &info->procs);
-        err |= __put_user (val.totalhigh, &info->totalhigh);
-        err |= __put_user (val.freehigh, &info->freehigh);
-        err |= __put_user (val.mem_unit, &info->mem_unit);
-        return err ? -EFAULT : 0;
-}
-
-
 /* lseek() needs a wrapper because 'offset' can be negative, but the top
  * half of the argument has been zeroed by syscall.S.
  */
diff --git a/arch/parisc/kernel/syscall_table.S b/arch/parisc/kernel/syscall_table.S
index 701d66a596e8..be8eb9a0d24a 100644
--- a/arch/parisc/kernel/syscall_table.S
+++ b/arch/parisc/kernel/syscall_table.S
@@ -197,7 +197,7 @@
         /* struct rusage contains longs... */
         ENTRY_COMP(wait4)
         ENTRY_SAME(swapoff)             /* 115 */
-        ENTRY_DIFF(sysinfo)
+        ENTRY_COMP(sysinfo)
         ENTRY_SAME(shutdown)
         ENTRY_SAME(fsync)
         ENTRY_SAME(madvise)