Patch "MIPS: Fix minimum alignment requirement of IRQ stack" has been added to the 4.4-stable tree

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

MIPS: Fix minimum alignment requirement of IRQ stack

to the 4.4-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:
mips-fix-minimum-alignment-requirement-of-irq-stack.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Matt Redfearn <[email protected]>
Date: Mon, 10 Jul 2017 09:43:31 +0100
Subject: MIPS: Fix minimum alignment requirement of IRQ stack

From: Matt Redfearn <[email protected]>

commit 5fdc66e046206306bf61ff2d626bfa52ca087f7b upstream.

Commit db8466c581cc ("MIPS: IRQ Stack: Unwind IRQ stack onto task stack") erroneously set the initial stack pointer of the IRQ stack to a value with a 4 byte alignment. The MIPS32 ABI requires that the minimum stack alignment is 8 byte, and the MIPS64 ABIs(n32/n64) require 16 byte minimum alignment. Fix IRQ_STACK_START such that it leaves space for the dummy stack frame (containing interrupted task kernel stack pointer) while also meeting minimum alignment requirements.

Patchwork: https://patchwork.linux-mips.org/patch/16760/

---
 arch/mips/include/asm/irq.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -18,7 +18,7 @@
 #include <irq.h>
 
 #define IRQ_STACK_SIZE			THREAD_SIZE
-#define IRQ_STACK_START			(IRQ_STACK_SIZE - sizeof(unsigned long))
+#define IRQ_STACK_START			(IRQ_STACK_SIZE - 16)
 
 extern void *irq_stack[NR_CPUS];
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/mips-fix-minimum-alignment-requirement-of-irq-stack.patch