Le 15/07/24 - 17:16, José Expósito a écrit : > Building with Sparse enabled prints this warning for cpu_to_le16() > calls: > > warning: incorrect type in assignment (different base types) > expected unsigned short [usertype] > got restricted __le16 [usertype] > > And this warning for le16_to_cpu() calls: > > warning: cast to restricted __le16 > > Declare the target buffer as __le16 to fix both warnings. > > Signed-off-by: José Expósito <jose.exposito89@xxxxxxxxx> > > --- > > v1 -> v2: https://lore.kernel.org/dri-devel/20240712161656.7480-1-jose.exposito89@xxxxxxxxx/T/ > > - Thomas Zimmermann: Declare "pixels" cariable as __le16 instead of > multiple casting. > --- > drivers/gpu/drm/vkms/vkms_formats.c | 14 +++++++------- > 1 file changed, 7 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c > index 36046b12f296..1ff535222bd4 100644 > --- a/drivers/gpu/drm/vkms/vkms_formats.c > +++ b/drivers/gpu/drm/vkms/vkms_formats.c > @@ -75,7 +75,7 @@ static void XRGB8888_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixe > > static void ARGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel) > { > - u16 *pixels = (u16 *)src_pixels; > + __le16 *pixels = (__force __le16 *)src_pixels; Hi, I think you don't need __force for this cast, so you can remove it. > out_pixel->a = le16_to_cpu(pixels[3]); > out_pixel->r = le16_to_cpu(pixels[2]); > @@ -85,7 +85,7 @@ static void ARGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_ > > static void XRGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel) > { > - u16 *pixels = (u16 *)src_pixels; > + __le16 *pixels = (__force __le16 *)src_pixels; > out_pixel->a = (u16)0xffff; > out_pixel->r = le16_to_cpu(pixels[2]); > @@ -95,7 +95,7 @@ static void XRGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_ > > static void RGB565_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel) > { > - u16 *pixels = (u16 *)src_pixels; > + __le16 *pixels = (__force __le16 *)src_pixels; > > s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31)); > s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63)); > @@ -178,7 +178,7 @@ static void argb_u16_to_XRGB8888(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel > > static void argb_u16_to_ARGB16161616(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel) > { > - u16 *pixels = (u16 *)dst_pixels; > + __le16 *pixels = (__force __le16 *)dst_pixels; > > pixels[3] = cpu_to_le16(in_pixel->a); > pixels[2] = cpu_to_le16(in_pixel->r); > @@ -188,9 +188,9 @@ static void argb_u16_to_ARGB16161616(u8 *dst_pixels, struct pixel_argb_u16 *in_p > > static void argb_u16_to_XRGB16161616(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel) > { > - u16 *pixels = (u16 *)dst_pixels; > + __le16 *pixels = (__force __le16 *)dst_pixels; > > - pixels[3] = 0xffff; > + pixels[3] = (__force __le16)0xffff; I agree with Thomas Zimmerman, I prefer cpu_to_le16(). With or without those modifications: Reviewed-by: Louis Chauvet <louis.chauvet@xxxxxxxxxxx> Thanks, Louis Chauvet > pixels[2] = cpu_to_le16(in_pixel->r); > pixels[1] = cpu_to_le16(in_pixel->g); > pixels[0] = cpu_to_le16(in_pixel->b); > @@ -198,7 +198,7 @@ static void argb_u16_to_XRGB16161616(u8 *dst_pixels, struct pixel_argb_u16 *in_p > > static void argb_u16_to_RGB565(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel) > { > - u16 *pixels = (u16 *)dst_pixels; > + __le16 *pixels = (__force __le16 *)dst_pixels; > > s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31)); > s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63)); > -- > 2.45.2 > -- Louis Chauvet, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
