linux-kernel - Re: [PATCH v2 2/6] bitmap: replace _reg_op(REG_OP_ALLOC) with bitmap

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Message-ID: <ZNYv4pt4HBUBZA60@yury-ThinkPad>
Date:   Fri, 11 Aug 2023 05:56:02 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v2 2/6] bitmap: replace _reg_op(REG_OP_ALLOC) with
 bitmap_set()

On Fri, Aug 11, 2023 at 08:21:33AM +0200, Rasmus Villemoes wrote:
> On 11/08/2023 02.57, Yury Norov wrote:
> > _reg_op(REG_OP_ALLOC) duplicates bitmap_set(). Fix it.
> > 
> > Signed-off-by: Yury Norov <yury.norov@...il.com>
> > ---
> >  lib/bitmap.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/lib/bitmap.c b/lib/bitmap.c
> > index 3a589016f5e0..c9afe704fe4b 100644
> > --- a/lib/bitmap.c
> > +++ b/lib/bitmap.c
> > @@ -1352,9 +1352,12 @@ EXPORT_SYMBOL(bitmap_release_region);
> >   */
> >  int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order)
> >  {
> > +	unsigned int nbits = pos + BIT(order);
> > +
> 
> That really doesn't sound right. Have you added self-tests for these
> functions first and then used those to catch regressions?

When bitmap_allocate_region() is broken, almost every arch build fails
to boot. Can you explain what exactly looks wrong to you?

Thanks,
Yury