On Wed, 2017-08-09 at 12:41 -0700, Greg Kroah-Hartman wrote:
> 4.4-stable review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Helge Deller <deller@xxxxxx>
>
> commit 8f8201dfed91a43ac38c899c82f81eef3d36afd9 upstream.
>
> Since kernel 4.11 the thread and irq stacks on parisc randomly overflow
> the default size of 16k. The reason why stack usage suddenly grew is yet
> unknown.
So we don't need this for 4.4.
Ben.
> Signed-off-by: Helge Deller <deller@xxxxxx>
> Signed-off-by: Helge Deller <deller@xxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>
> ---
> arch/parisc/include/asm/thread_info.h | 2 +-
> arch/parisc/kernel/irq.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> --- a/arch/parisc/include/asm/thread_info.h
> +++ b/arch/parisc/include/asm/thread_info.h
> @@ -34,7 +34,7 @@ struct thread_info {
>
> /* thread information allocation */
>
> -#define THREAD_SIZE_ORDER 2 /* PA-RISC requires at least 16k stack */
> +#define THREAD_SIZE_ORDER 3 /* PA-RISC requires at least 32k stack */
> /* 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)
> --- a/arch/parisc/kernel/irq.c
> +++ b/arch/parisc/kernel/irq.c
> @@ -380,7 +380,7 @@ static inline int eirr_to_irq(unsigned l
> /*
> * IRQ STACK - used for irq handler
> */
> -#define IRQ_STACK_SIZE (4096 << 2) /* 16k irq stack size */
> +#define IRQ_STACK_SIZE (4096 << 3) /* 32k irq stack size */
>
> union irq_stack_union {
> unsigned long stack[IRQ_STACK_SIZE/sizeof(unsigned long)];
>
>
--
Ben Hutchings
Software Developer, Codethink Ltd.