Hi Arnd,
Thank you for the patch.
On Tue, Jan 07, 2020 at 10:27:33PM +0100, Arnd Bergmann wrote:
> With gcc -O3, the compiler can inline very aggressively,
> leading to rather large stack usage:
>
> drivers/gpu/drm/panel/panel-tpo-td028ttec1.c: In function 'td028ttec1_prepare':
> drivers/gpu/drm/panel/panel-tpo-td028ttec1.c:233:1: error: the frame size of 2768 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
> }
>
> Marking jbt_reg_write_1() as noinline avoids the case where
> multiple instances of this function get inlined into the same
> stack frame and each one adds a copy of 'tx_buf'.
>
> Fixes: mmtom ("init/Kconfig: enable -O3 for all arches")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Isn't this something that should be fixed at the compiler level ?
> ---
> drivers/gpu/drm/panel/panel-tpo-td028ttec1.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c b/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
> index cf29405a2dbe..17ee5e87141f 100644
> --- a/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
> +++ b/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
> @@ -105,7 +105,7 @@ static int jbt_ret_write_0(struct td028ttec1_panel *lcd, u8 reg, int *err)
> return ret;
> }
>
> -static int jbt_reg_write_1(struct td028ttec1_panel *lcd,
> +static int noinline_for_stack jbt_reg_write_1(struct td028ttec1_panel *lcd,
> u8 reg, u8 data, int *err)
> {
> struct spi_device *spi = lcd->spi;
--
Regards,
Laurent Pinchart
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