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authorLinus Torvalds <torvalds@linux-foundation.org>2014-09-26 08:38:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-09-26 08:38:09 -0700
commitd2865c7d4ef818421941579e185c1e4743692f85 (patch)
treefc1fe4b5c46bb059398fab8860360bdbe52f22bb /include
parent8207649c41bf5c28a987be47d66545fa9d2994d8 (diff)
parent03bd4e1f7265548832a76e7919a81f3137c44fd1 (diff)
downloadlinux-linaro-stable-d2865c7d4ef818421941579e185c1e4743692f85.tar.gz
Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Ingo Molnar: "A CONFIG_STACK_GROWSUP=y fix, and a hotplug llc CPU mask fix" * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched: Fix unreleased llc_shared_mask bit during CPU hotplug sched: Fix end_of_stack() and location of stack canary for architectures using CONFIG_STACK_GROWSUP
Diffstat (limited to 'include')
-rw-r--r--include/linux/sched.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5c2c885ee52b..1f07040d28e3 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2608,9 +2608,22 @@ static inline void setup_thread_stack(struct task_struct *p, struct task_struct
task_thread_info(p)->task = p;
}
+/*
+ * Return the address of the last usable long on the stack.
+ *
+ * When the stack grows down, this is just above the thread
+ * info struct. Going any lower will corrupt the threadinfo.
+ *
+ * When the stack grows up, this is the highest address.
+ * Beyond that position, we corrupt data on the next page.
+ */
static inline unsigned long *end_of_stack(struct task_struct *p)
{
+#ifdef CONFIG_STACK_GROWSUP
+ return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1;
+#else
return (unsigned long *)(task_thread_info(p) + 1);
+#endif
}
#endif