From 5fdc66e046206306bf61ff2d626bfa52ca087f7b Mon Sep 17 00:00:00 2001 From: Matt Redfearn Date: Mon, 10 Jul 2017 09:43:31 +0100 Subject: [PATCH] MIPS: Fix minimum alignment requirement of IRQ stack 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 Signed-off-by: Matt Redfearn Cc: Chris Metcalf Cc: Petr Mladek Cc: Aaron Tomlin Cc: Jason A. Donenfeld Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/16760/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/irq.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/mips/include/asm/irq.h b/arch/mips/include/asm/irq.h index ddd1c918103bc..c5d3517864162 100644 --- a/arch/mips/include/asm/irq.h +++ b/arch/mips/include/asm/irq.h @@ -18,7 +18,7 @@ #include #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]; -- 2.39.5