[PATCH] uml: fix hugest stack users

The C99 initialization, with GCC's bad handling, for 6K wide structs (which
_aren't_ on the stack), is causing GCC to use 12K for these silly procs with 3
vars.  Workaround this.

Note that .name = { '\0' } translates to memset(->name, 0, '->name' size) - I verified
this with GCC's docs and a testprogram.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 22 insertions, 19 deletions

diff --git a/arch/um/drivers/slip_common.h b/arch/um/drivers/slip_common.h
index 2ae76d8f1be1..d574e0a9dc13 100644
--- a/arch/um/drivers/slip_common.h
+++ b/arch/um/drivers/slip_common.h
@@ -88,12 +88,13 @@ struct slip_proto {
         int esc;
 };
 
-#define SLIP_PROTO_INIT { \
-        .ibuf   = { '\0' }, \
-        .obuf   = { '\0' }, \
-        .more   = 0, \
-        .pos    = 0, \
-        .esc    = 0 \
+static inline void slip_proto_init(struct slip_proto * slip)
+{
+        memset(slip->ibuf, 0, sizeof(slip->ibuf));
+        memset(slip->obuf, 0, sizeof(slip->obuf));
+        slip->more = 0;
+        slip->pos = 0;
+        slip->esc = 0;
 }
 
 extern int slip_proto_read(int fd, void *buf, int len,
diff --git a/arch/um/drivers/slip_kern.c b/arch/um/drivers/slip_kern.c
index 9a6f5c85f902..a62f5ef445cf 100644
--- a/arch/um/drivers/slip_kern.c
+++ b/arch/um/drivers/slip_kern.c
@@ -21,13 +21,14 @@ void slip_init(struct net_device *dev, void *data)
 
         private = dev->priv;
         spri = (struct slip_data *) private->user;
-        *spri = ((struct slip_data)
-                { .name         = { '\0' },
-                  .addr         = NULL,
-                  .gate_addr    = init->gate_addr,
-                  .slave        = -1,
-                  .slip         = SLIP_PROTO_INIT,
-                  .dev          = dev });
+
+        memset(spri->name, 0, sizeof(spri->name));
+        spri->addr = NULL;
+        spri->gate_addr = init->gate_addr;
+        spri->slave = -1;
+        spri->dev = dev;
+
+        slip_proto_init(&spri->slip);
 
         dev->init = NULL;
         dev->header_cache_update = NULL;
diff --git a/arch/um/drivers/slirp_kern.c b/arch/um/drivers/slirp_kern.c
index 9864d27afdbe..33d7982be5d3 100644
--- a/arch/um/drivers/slirp_kern.c
+++ b/arch/um/drivers/slirp_kern.c
@@ -21,12 +21,13 @@ void slirp_init(struct net_device *dev, void *data)
 
         private = dev->priv;
         spri = (struct slirp_data *) private->user;
-        *spri = ((struct slirp_data)
-                { .argw         = init->argw,
-                  .pid          = -1,
-                  .slave        = -1,
-                  .slip         = SLIP_PROTO_INIT,
-                  .dev          = dev });
+
+        spri->argw = init->argw;
+        spri->pid = -1;
+        spri->slave = -1;
+        spri->dev = dev;
+
+        slip_proto_init(&spri->slip);
 
         dev->init = NULL;
         dev->hard_header_len = 0;