On Wed, Dec 07, 2022 at 02:19:36PM +0200, Vladimir Oltean wrote:
> On Wed, Dec 07, 2022 at 02:23:28PM +0300, Dan Carpenter wrote:
> > The bit_reverse() function is clearly supposed to be able to handle
> > 64 bit values, but the types for "(1 << i)" and "bit << (width - i - 1)"
> > are not enough to handle more than 32 bits.
> >
> > Fixes: 554aae35007e ("lib: Add support for generic packing operations")
> > Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>
> > ---
> > lib/packing.c | 5 ++---
> > 1 file changed, 2 insertions(+), 3 deletions(-)
> >
> > diff --git a/lib/packing.c b/lib/packing.c
> > index 9a72f4bbf0e2..9d7418052f5a 100644
> > --- a/lib/packing.c
> > +++ b/lib/packing.c
> > @@ -32,12 +32,11 @@ static int get_reverse_lsw32_offset(int offset, size_t len)
> > static u64 bit_reverse(u64 val, unsigned int width)
> > {
> > u64 new_val = 0;
> > - unsigned int bit;
> > unsigned int i;
> >
> > for (i = 0; i < width; i++) {
> > - bit = (val & (1 << i)) != 0;
> > - new_val |= (bit << (width - i - 1));
> > + if (val & BIT_ULL(1))
>
> hmm, why 1 and not i?
Because I'm a moron. Let me resend.
regards,
dan carpenter
