Messages in this thread | | | Date | Thu, 19 May 2022 15:05:08 +0200 | From | Daniel Vetter <> | Subject | Re: [PATCH 04/11] drm/r128: Fix undefined behavior due to shift overflowing the constant |
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On Mon, Apr 25, 2022 at 11:46:53AM -0700, Randy Dunlap wrote: > > > On 4/5/22 08:15, Borislav Petkov wrote: > > From: Borislav Petkov <bp@suse.de> > > > > Fix: > > > > drivers/gpu/drm/r128/r128_cce.c: In function ‘r128_do_init_cce’: > > drivers/gpu/drm/r128/r128_cce.c:417:2: error: case label does not reduce to an integer constant > > case R128_PM4_64BM_64VCBM_64INDBM: > > ^~~~ > > drivers/gpu/drm/r128/r128_cce.c:418:2: error: case label does not reduce to an integer constant > > case R128_PM4_64PIO_64VCPIO_64INDPIO: > > ^~~~ > > > > See https://lore.kernel.org/r/YkwQ6%2BtIH8GQpuct@zn.tnic for the gory > > details as to why it triggers with older gccs only. > > > > Signed-off-by: Borislav Petkov <bp@suse.de> > > Cc: David Airlie <airlied@linux.ie> > > Cc: Daniel Vetter <daniel@ffwll.ch> > > Cc: Alex Deucher <alexander.deucher@amd.com> > > Cc: dri-devel@lists.freedesktop.org > > Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Pushed to drm-misc-next, thanks for patch&review. -Daniel
> > Thanks. > > > --- > > drivers/gpu/drm/r128/r128_drv.h | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/gpu/drm/r128/r128_drv.h b/drivers/gpu/drm/r128/r128_drv.h > > index 2e1bc01aa5c9..970e192b0d51 100644 > > --- a/drivers/gpu/drm/r128/r128_drv.h > > +++ b/drivers/gpu/drm/r128/r128_drv.h > > @@ -300,8 +300,8 @@ extern long r128_compat_ioctl(struct file *filp, unsigned int cmd, > > # define R128_PM4_64PIO_128INDBM (5 << 28) > > # define R128_PM4_64BM_128INDBM (6 << 28) > > # define R128_PM4_64PIO_64VCBM_64INDBM (7 << 28) > > -# define R128_PM4_64BM_64VCBM_64INDBM (8 << 28) > > -# define R128_PM4_64PIO_64VCPIO_64INDPIO (15 << 28) > > +# define R128_PM4_64BM_64VCBM_64INDBM (8U << 28) > > +# define R128_PM4_64PIO_64VCPIO_64INDPIO (15U << 28) > > # define R128_PM4_BUFFER_CNTL_NOUPDATE (1 << 27) > > > > #define R128_PM4_BUFFER_WM_CNTL 0x0708 > > -- > ~Randy
-- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch
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