linux-kernel - [PATCH 4.4 03/46] MIPS: Fix minimum alignment requirement of IRQ stack

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Message-Id: <20171019134845.560949752@linuxfoundation.org>
Date:   Thu, 19 Oct 2017 15:48:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Darius Ivanauskas <dasilt@...oo.com>,
        Matt Redfearn <matt.redfearn@...tec.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Petr Mladek <pmladek@...e.com>,
        Aaron Tomlin <atomlin@...hat.com>,
        "Jason A. Donenfeld" <jason@...c4.com>, linux-mips@...ux-mips.org,
        Ralf Baechle <ralf@...ux-mips.org>
Subject: [PATCH 4.4 03/46] MIPS: Fix minimum alignment requirement of IRQ stack

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Matt Redfearn <matt.redfearn@...tec.com>

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.

Fixes: db8466c581cc ("MIPS: IRQ Stack: Unwind IRQ stack onto task stack")
Reported-by: Darius Ivanauskas <dasilt@...oo.com>
Signed-off-by: Matt Redfearn <matt.redfearn@...tec.com>
Cc: Chris Metcalf <cmetcalf@...lanox.com>
Cc: Petr Mladek <pmladek@...e.com>
Cc: Aaron Tomlin <atomlin@...hat.com>
Cc: Jason A. Donenfeld <jason@...c4.com>
Cc: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16760/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/arch/mips/include/asm/irq.h
+++ b/arch/mips/include/asm/irq.h
@@ -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];