On Thu, Jun 03, 2021 at 02:19:52PM -0700, Kees Cook wrote: > On Thu, Jun 03, 2021 at 09:19:42PM +0200, Daniel Vetter wrote: > > On Thu, Jun 3, 2021 at 8:43 PM Rob Herring <robh@xxxxxxxxxx> wrote: > > > > > > On Wed, Jun 2, 2021 at 4:53 PM Kees Cook <keescook@xxxxxxxxxxxx> wrote: > > > > > > > > Avoid randconfig build failures by requiring VEXPRESS_CONFIG: > > > > > > > > aarch64-linux-gnu-ld: drivers/gpu/drm/pl111/pl111_versatile.o: in function `pl111_vexpress_clcd_init': > > > > pl111_versatile.c:(.text+0x220): undefined reference to `devm_regmap_init_vexpress_config' > > > > > > pl111_vexpress_clcd_init() starts with: > > > > > > if (!IS_ENABLED(CONFIG_VEXPRESS_CONFIG)) > > > return -ENODEV; > > > > > > Isn't that supposed to be enough to avoid an undefined reference? > > Ah! I missed that when reading the code. I see the problem now. It's > because of: > > CONFIG_VEXPRESS_CONFIG=m > CONFIG_DRM_PL111=y > > I think the right fix is: > > diff --git a/drivers/gpu/drm/pl111/Kconfig b/drivers/gpu/drm/pl111/Kconfig > index 80f6748055e3..662fc38f92ba 100644 > --- a/drivers/gpu/drm/pl111/Kconfig > +++ b/drivers/gpu/drm/pl111/Kconfig > @@ -3,6 +3,7 @@ config DRM_PL111 > tristate "DRM Support for PL111 CLCD Controller" > depends on DRM > depends on ARM || ARM64 || COMPILE_TEST > + depends on VEXPRESS_CONFIG=y || VEXPRESS_CONFIG=DRM Oops, no, I had this backwairds: depends on !VEXPRESS_CONFIG || VEXPRESS_CONFIG=DRM _that_ lets me build with: # CONFIG_VEXPRESS_CONFIG is not set CONFIG_DRM_PL111=y CONFIG_VEXPRESS_CONFIG=y CONFIG_DRM_PL111=y CONFIG_VEXPRESS_CONFIG=m CONFIG_DRM_PL111=m CONFIG_VEXPRESS_CONFIG=y CONFIG_DRM_PL111=m and disallows: CONFIG_VEXPRESS_CONFIG=m CONFIG_DRM_PL111=y (this will force CONFIG_DRM_PL111=m) -Kees > depends on COMMON_CLK > select DRM_KMS_HELPER > select DRM_KMS_CMA_HELPER > > I will go check the defconfigs Rob mentioned... > > > > Making the whole file depend on VEXPRESS_CONFIG is not right either. > > > Not all platforms need it. > > > > It needs a compile-time status inline then for the functions we're > > using in pl111. > > FYI, this is the config I was working from, which was throwing link errors: > https://lore.kernel.org/lkml/202105300926.fX0MYySp-lkp@xxxxxxxxx/ > > > -Daniel > > > > > > > > > > > > > Fixes: 826fc86b5903 ("drm: pl111: Move VExpress setup into versatile init") > > > > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> > > > > --- > > > > drivers/gpu/drm/pl111/Kconfig | 2 +- > > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > > > diff --git a/drivers/gpu/drm/pl111/Kconfig b/drivers/gpu/drm/pl111/Kconfig > > > > index 80f6748055e3..c5210a5bef1b 100644 > > > > --- a/drivers/gpu/drm/pl111/Kconfig > > > > +++ b/drivers/gpu/drm/pl111/Kconfig > > > > @@ -2,7 +2,7 @@ > > > > config DRM_PL111 > > > > tristate "DRM Support for PL111 CLCD Controller" > > > > depends on DRM > > > > - depends on ARM || ARM64 || COMPILE_TEST > > > > + depends on VEXPRESS_CONFIG > > > > depends on COMMON_CLK > > > > select DRM_KMS_HELPER > > > > select DRM_KMS_CMA_HELPER > > > > -- > > > > 2.25.1 > > > > > > > > > > > > -- > > Daniel Vetter > > Software Engineer, Intel Corporation > > http://blog.ffwll.ch > > -- > Kees Cook -- Kees Cook
