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authorJeff Dike <jdike@addtoit.com>2006-09-29 01:58:52 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:04 -0700
commitf92afe56a0dcd271cb94e12acf1861d44c3faefd (patch)
tree4c8fc05c2dd6d9142ab3e5850ccbb5ff7b0065d1 /arch
parent80c13749140284abdc23bbeed2507b7e5a3dc459 (diff)
downloadlinaro-lsk-f92afe56a0dcd271cb94e12acf1861d44c3faefd.tar.gz
[PATCH] uml: stack consumption reduction
Fix some stack abuse in the sysrq t path. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/um/drivers/mconsole_kern.c15
-rw-r--r--arch/um/drivers/mconsole_user.c4
2 files changed, 14 insertions, 5 deletions
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 79610b5ce67..773a134e7fd 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -598,6 +598,11 @@ out:
mconsole_reply(req, err_msg, err, 0);
}
+struct mconsole_output {
+ struct list_head list;
+ struct mc_request *req;
+};
+
static DEFINE_SPINLOCK(console_lock);
static LIST_HEAD(clients);
static char console_buf[MCONSOLE_MAX_DATA];
@@ -622,10 +627,10 @@ static void console_write(struct console *console, const char *string,
return;
list_for_each(ele, &clients){
- struct mconsole_entry *entry;
+ struct mconsole_output *entry;
- entry = list_entry(ele, struct mconsole_entry, list);
- mconsole_reply_len(&entry->request, console_buf,
+ entry = list_entry(ele, struct mconsole_output, list);
+ mconsole_reply_len(entry->req, console_buf,
console_index, 0, 1);
}
@@ -649,10 +654,10 @@ late_initcall(mc_add_console);
static void with_console(struct mc_request *req, void (*proc)(void *),
void *arg)
{
- struct mconsole_entry entry;
+ struct mconsole_output entry;
unsigned long flags;
- entry.request = *req;
+ entry.req = req;
list_add(&entry.list, &clients);
spin_lock_irqsave(&console_lock, flags);
diff --git a/arch/um/drivers/mconsole_user.c b/arch/um/drivers/mconsole_user.c
index 5b2f5fe9e42..17068eb746c 100644
--- a/arch/um/drivers/mconsole_user.c
+++ b/arch/um/drivers/mconsole_user.c
@@ -131,6 +131,10 @@ int mconsole_get_request(int fd, struct mc_request *req)
int mconsole_reply_len(struct mc_request *req, const char *str, int total,
int err, int more)
{
+ /* XXX This is a stack consumption problem. It'd be nice to
+ * make it global and serialize access to it, but there are a
+ * ton of callers to this function.
+ */
struct mconsole_reply reply;
int len, n;