[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>

1 files changed, 33 insertions, 25 deletions

diff --git a/kernel/timer.c b/kernel/timer.c
index 31ab627df8a0..8533c3796082 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1392,17 +1392,16 @@ asmlinkage long sys_gettid(void)
 }
 
 /**
- * sys_sysinfo - fill in sysinfo struct
+ * do_sysinfo - fill in sysinfo struct
  * @info: pointer to buffer to fill
  */ 
-asmlinkage long sys_sysinfo(struct sysinfo __user *info)
+int do_sysinfo(struct sysinfo *info)
 {
-        struct sysinfo val;
         unsigned long mem_total, sav_total;
         unsigned int mem_unit, bitcount;
         unsigned long seq;
 
-        memset((char *)&val, 0, sizeof(struct sysinfo));
+        memset(info, 0, sizeof(struct sysinfo));
 
         do {
                 struct timespec tp;
@@ -1422,17 +1421,17 @@ asmlinkage long sys_sysinfo(struct sysinfo __user *info)
                         tp.tv_nsec = tp.tv_nsec - NSEC_PER_SEC;
                         tp.tv_sec++;
                 }
-                val.uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
+                info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
 
-                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);
+                info->loads[0] = avenrun[0] << (SI_LOAD_SHIFT - FSHIFT);
+                info->loads[1] = avenrun[1] << (SI_LOAD_SHIFT - FSHIFT);
+                info->loads[2] = avenrun[2] << (SI_LOAD_SHIFT - FSHIFT);
 
-                val.procs = nr_threads;
+                info->procs = nr_threads;
         } while (read_seqretry(&xtime_lock, seq));
 
-        si_meminfo(&val);
-        si_swapinfo(&val);
+        si_meminfo(info);
+        si_swapinfo(info);
 
         /*
          * If the sum of all the available memory (i.e. ram + swap)
@@ -1443,11 +1442,11 @@ asmlinkage long sys_sysinfo(struct sysinfo __user *info)
          *  -Erik Andersen <andersee@debian.org>
          */
 
-        mem_total = val.totalram + val.totalswap;
-        if (mem_total < val.totalram || mem_total < val.totalswap)
+        mem_total = info->totalram + info->totalswap;
+        if (mem_total < info->totalram || mem_total < info->totalswap)
                 goto out;
         bitcount = 0;
-        mem_unit = val.mem_unit;
+        mem_unit = info->mem_unit;
         while (mem_unit > 1) {
                 bitcount++;
                 mem_unit >>= 1;
@@ -1459,22 +1458,31 @@ asmlinkage long sys_sysinfo(struct sysinfo __user *info)
 
         /*
          * If mem_total did not overflow, multiply all memory values by
-         * val.mem_unit and set it to 1.  This leaves things compatible
+         * info->mem_unit and set it to 1.  This leaves things compatible
          * with 2.2.x, and also retains compatibility with earlier 2.4.x
          * kernels...
          */
 
-        val.mem_unit = 1;
-        val.totalram <<= bitcount;
-        val.freeram <<= bitcount;
-        val.sharedram <<= bitcount;
-        val.bufferram <<= bitcount;
-        val.totalswap <<= bitcount;
-        val.freeswap <<= bitcount;
-        val.totalhigh <<= bitcount;
-        val.freehigh <<= bitcount;
+        info->mem_unit = 1;
+        info->totalram <<= bitcount;
+        info->freeram <<= bitcount;
+        info->sharedram <<= bitcount;
+        info->bufferram <<= bitcount;
+        info->totalswap <<= bitcount;
+        info->freeswap <<= bitcount;
+        info->totalhigh <<= bitcount;
+        info->freehigh <<= bitcount;
+
+out:
+        return 0;
+}
+
+asmlinkage long sys_sysinfo(struct sysinfo __user *info)
+{
+        struct sysinfo val;
+
+        do_sysinfo(&val);
 
- out:
         if (copy_to_user(info, &val, sizeof(struct sysinfo)))
                 return -EFAULT;