[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/sparc64/kernel/sys_sparc32.c b/arch/sparc64/kernel/sys_sparc32.c
index e27cb71bd8e..7876a022628 100644
--- a/arch/sparc64/kernel/sys_sparc32.c
+++ b/arch/sparc64/kernel/sys_sparc32.c
@@ -459,70 +459,6 @@ asmlinkage long compat_sys_sysfs(int option, u32 arg1, u32 arg2)
 	return sys_sysfs(option, arg1, arg2);
 }
 
-struct sysinfo32 {
-        s32 uptime;
-        u32 loads[3];
-        u32 totalram;
-        u32 freeram;
-        u32 sharedram;
-        u32 bufferram;
-        u32 totalswap;
-        u32 freeswap;
-        unsigned short procs;
-	unsigned short pad;
-	u32 totalhigh;
-	u32 freehigh;
-	u32 mem_unit;
-	char _f[20-2*sizeof(int)-sizeof(int)];
-};
-
-asmlinkage long sys32_sysinfo(struct sysinfo32 __user *info)
-{
-	struct sysinfo s;
-	int 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;
-	}
-
-	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 compat_sys_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval)
 {
 	struct timespec t;
diff --git a/arch/sparc64/kernel/systbls.S b/arch/sparc64/kernel/systbls.S
index 9a8026797ac..948b7d2d587 100644
--- a/arch/sparc64/kernel/systbls.S
+++ b/arch/sparc64/kernel/systbls.S
@@ -61,7 +61,7 @@ sys_call_table32:
 	.word sys32_epoll_wait, sys32_ioprio_set, sys_getppid, sys32_sigaction, sys_sgetmask
 /*200*/	.word sys32_ssetmask, sys_sigsuspend, compat_sys_newlstat, sys_uselib, compat_sys_old_readdir
 	.word sys32_readahead, sys32_socketcall, sys32_syslog, sys32_lookup_dcookie, sys32_fadvise64
-/*210*/	.word sys32_fadvise64_64, sys32_tgkill, sys32_waitpid, sys_swapoff, sys32_sysinfo
+/*210*/	.word sys32_fadvise64_64, sys32_tgkill, sys32_waitpid, sys_swapoff, compat_sys_sysinfo
 	.word sys32_ipc, sys32_sigreturn, sys_clone, sys32_ioprio_get, compat_sys_adjtimex
 /*220*/	.word sys32_sigprocmask, sys_ni_syscall, sys32_delete_module, sys_ni_syscall, sys32_getpgid
 	.word sys32_bdflush, sys32_sysfs, sys_nis_syscall, sys32_setfsuid16, sys32_setfsgid16