Patch "parisc: Reduce thread stack to 16 kb" has been added to the 4.14-stable tree

Patch "parisc: Reduce thread stack to 16 kb" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    parisc: Reduce thread stack to 16 kb

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     parisc-reduce-thread-stack-to-16-kb.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Feb 28 16:23:28 CET 2018
From: John David Anglin <dave.anglin@bell.net>
Date: Mon, 13 Nov 2017 19:35:33 -0500
Subject: parisc: Reduce thread stack to 16 kb

From: John David Anglin <dave.anglin@bell.net>


[ Upstream commit da57c5414f49ef9e4bcb9ae0bbafd1d650b31411 ]

In testing, I found that the thread stack can be 16 kB when using an irq
stack.  Without it, the thread stack needs to be 32 kB. Currently, the irq
stack is 32 kB. While it probably could be 16 kB, I would prefer to leave it
as is for safety.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/parisc/include/asm/thread_info.h |    5 +++++
 1 file changed, 5 insertions(+)

--- a/arch/parisc/include/asm/thread_info.h
+++ b/arch/parisc/include/asm/thread_info.h
@@ -35,7 +35,12 @@ struct thread_info {
 
 /* thread information allocation */
 
+#ifdef CONFIG_IRQSTACKS
+#define THREAD_SIZE_ORDER	2 /* PA-RISC requires at least 16k stack */
+#else
 #define THREAD_SIZE_ORDER	3 /* PA-RISC requires at least 32k stack */
+#endif
+
 /* Be sure to hunt all references to this down when you change the size of
  * the kernel stack */
 #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)


Patches currently in stable-queue which might be from dave.anglin@bell.net are

queue-4.14/parisc-reduce-thread-stack-to-16-kb.patch