[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, 69 deletions

diff --git a/arch/ia64/ia32/ia32_entry.S b/arch/ia64/ia32/ia32_entry.S
index a32cd59..687e5fd 100644
--- a/arch/ia64/ia32/ia32_entry.S
+++ b/arch/ia64/ia32/ia32_entry.S
@@ -326,7 +326,7 @@ ia32_syscall_table:
 	data8 sys_ni_syscall
 	data8 compat_sys_wait4
 	data8 sys_swapoff	  /* 115 */
-	data8 sys32_sysinfo
+	data8 compat_sys_sysinfo
 	data8 sys32_ipc
 	data8 sys_fsync
 	data8 sys32_sigreturn
diff --git a/arch/ia64/ia32/sys_ia32.c b/arch/ia64/ia32/sys_ia32.c
index 957681c..d430d36 100644
--- a/arch/ia64/ia32/sys_ia32.c
+++ b/arch/ia64/ia32/sys_ia32.c
@@ -2209,74 +2209,6 @@ sys32_fstat64 (unsigned int fd, struct stat64 __user *statbuf)
 	return ret;
 }
 
-struct sysinfo32 {
-	s32 uptime;
-	u32 loads[3];
-	u32 totalram;
-	u32 freeram;
-	u32 sharedram;
-	u32 bufferram;
-	u32 totalswap;
-	u32 freeswap;
-	u16 procs;
-	u16 pad;
-	u32 totalhigh;
-	u32 freehigh;
-	u32 mem_unit;
-	char _f[8];
-};
-
-asmlinkage long
-sys32_sysinfo (struct sysinfo32 __user *info)
-{
-	struct sysinfo s;
-	long ret, err;
-	int bitcount = 0;
-	mm_segment_t old_fs = get_fs();
-
-	set_fs(KERNEL_DS);
-	ret = sys_sysinfo((struct sysinfo __user *) &s);
-	set_fs(old_fs);
-	/* Check to see if any memory value is too large for 32-bit and
-	 * scale down if needed.
-	 */
-	if ((s.totalram >> 32) || (s.totalswap >> 32)) {
-		while (s.mem_unit < PAGE_SIZE) {
-			s.mem_unit <<= 1;
-			bitcount++;
-		}
-		s.totalram >>= bitcount;
-		s.freeram >>= bitcount;
-		s.sharedram >>= bitcount;
-		s.bufferram >>= bitcount;
-		s.totalswap >>= bitcount;
-		s.freeswap >>= bitcount;
-		s.totalhigh >>= bitcount;
-		s.freehigh >>= bitcount;
-	}
-
-	if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
-		return -EFAULT;
-
-	err  = __put_user(s.uptime, &info->uptime);
-	err |= __put_user(s.loads[0], &info->loads[0]);
-	err |= __put_user(s.loads[1], &info->loads[1]);
-	err |= __put_user(s.loads[2], &info->loads[2]);
-	err |= __put_user(s.totalram, &info->totalram);
-	err |= __put_user(s.freeram, &info->freeram);
-	err |= __put_user(s.sharedram, &info->sharedram);
-	err |= __put_user(s.bufferram, &info->bufferram);
-	err |= __put_user(s.totalswap, &info->totalswap);
-	err |= __put_user(s.freeswap, &info->freeswap);
-	err |= __put_user(s.procs, &info->procs);
-	err |= __put_user (s.totalhigh, &info->totalhigh);
-	err |= __put_user (s.freehigh, &info->freehigh);
-	err |= __put_user (s.mem_unit, &info->mem_unit);
-	if (err)
-		return -EFAULT;
-	return ret;
-}
-
 asmlinkage long
 sys32_sched_rr_get_interval (pid_t pid, struct compat_timespec __user *interval)
 {