linux-kernel - [PATCH 1/1] task_stack: make code generic for getting end of stack.

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Date:   Wed, 19 Dec 2018 14:05:02 +0530
From:   Maninder Singh <maninder1.s@...sung.com>
To:     linux-kernel@...r.kernel.org, luto@...nel.org
Cc:     a.sahrawat@...sung.com, pankaj.m@...sung.com,
        Maninder Singh <maninder1.s@...sung.com>,
        Vaneet Narang <v.narang@...sung.com>
Subject: [PATCH 1/1] task_stack: make code generic for getting end of stack.

currently code provides end of stack by considering stack grows
downwards. Make it useful for architectures where stack grows upward.

Although CONFIG_THREAD_INFO_IN_TASK is selected only for
architectures where stack grows downward.

Signed-off-by: Maninder Singh <maninder1.s@...sung.com>
Signed-off-by: Vaneet Narang <v.narang@...sung.com>
---
 include/linux/sched/task_stack.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/sched/task_stack.h b/include/linux/sched/task_stack.h
index 6a84192..4f099d3 100644
--- a/include/linux/sched/task_stack.h
+++ b/include/linux/sched/task_stack.h
@@ -25,7 +25,11 @@ static inline void *task_stack_page(const struct task_struct *task)
 
 static inline unsigned long *end_of_stack(const struct task_struct *task)
 {
+#ifdef CONFIG_STACK_GROWSUP
+	return (unsigned long *)((unsigned long)task->stack + THREAD_SIZE) - 1;
+#else
 	return task->stack;
+#endif
 }
 
 #elif !defined(__HAVE_THREAD_FUNCTIONS)
-- 
1.9.1