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Date:   Mon, 4 Apr 2022 17:02:41 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Palmer Dabbelt <palmer@rivosinc.com>
Cc:     ogabbay@kernel.org, linux-riscv@lists.infradead.org,
        Arnd Bergmann <arnd@arndb.de>, linux-kernel@vger.kernel.org,
        osharabi@habana.ai
Subject: Re: [PATCH] habanalabs: Elide a warning on 32-bit targets
Message-ID: <YksIkY0l8k7mmnzJ@kroah.com>
References: <CAFCwf13-o=kUR61xjWt=F-Q-Vfy=kF6fpMP7iB+83Gfqw7+2HA@mail.gmail.com>
 <mhng-89bfa679-14d3-436e-80e1-439ab154beb2@palmer-mbp2014>
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On Fri, Apr 01, 2022 at 11:36:53AM -0700, Palmer Dabbelt wrote:
> On Fri, 01 Apr 2022 11:13:48 PDT (-0700), ogabbay@kernel.org wrote:
> > On Fri, Apr 1, 2022 at 7:41 PM Palmer Dabbelt <palmer@rivosinc.com> wrote:
> > > 
> > > From: Palmer Dabbelt <palmer@rivosinc.com>
> > > 
> > > This double-cast pattern looks a bit awkward, but it already exists
> > > elsewhere in the driver.  Without this patch I get
> > > 
> > > drivers/misc/habanalabs/common/memory.c: In function ‘alloc_device_memory’:
> > > drivers/misc/habanalabs/common/memory.c:153:49: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
> > >   153 |                                                 (u64) gen_pool_dma_alloc_align(vm->dram_pg_pool,
> > >       |                                                 ^
> > > 
> > > which ends up promoted to a build error in my test setup.
> > > 
> > > Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
> > > 
> > > ---
> > > 
> > > I don't know anything about this driver, I'm just pattern-matching the
> > > warning away.
> > > ---
> > >  drivers/misc/habanalabs/common/memory.c | 10 +++++-----
> > >  1 file changed, 5 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
> > > index e008d82e4ba3..f1fc79c1fc10 100644
> > > --- a/drivers/misc/habanalabs/common/memory.c
> > > +++ b/drivers/misc/habanalabs/common/memory.c
> > > @@ -150,12 +150,12 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
> > >                 for (i = 0 ; i < num_pgs ; i++) {
> > >                         if (is_power_of_2(page_size))
> > >                                 phys_pg_pack->pages[i] =
> > > -                                               (u64) gen_pool_dma_alloc_align(vm->dram_pg_pool,
> > > -                                                                               page_size, NULL,
> > > -                                                                               page_size);
> > > +                                               (u64) (uintptr_t) gen_pool_dma_alloc_align(vm->dram_pg_pool,
> > > +                                                                                          page_size, NULL,
> > > +                                                                                          page_size);
> > >                         else
> > > -                               phys_pg_pack->pages[i] = (u64) gen_pool_alloc(vm->dram_pg_pool,
> > > -                                                                               page_size);
> > > +                               phys_pg_pack->pages[i] = (u64) (uintptr_t) gen_pool_alloc(vm->dram_pg_pool,
> > > +                                                                                         page_size);
> > >                         if (!phys_pg_pack->pages[i]) {
> > >                                 dev_err(hdev->dev,
> > >                                         "Failed to allocate device memory (out of memory)\n");
> > > --
> > > 2.34.1
> > > 
> > 
> > This patch is:
> > Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
> > 
> > Greg,
> > Could you please apply this directly to your misc tree and send it to
> > Linus at your next pull request ?
> > I don't have any other fixes pending for 5.18.
> > 
> > For 5.19 we will do a more elegant solution that Arnd has recommended.
> 
> Thanks.
> 
> Assuming this is too late for rc1, would it be possibe to have it in
> something I can take into my fixes/for-next without too much diff?  I put
> this on top of the offending commit with a
> 
> Fixes: e8458e20e0a3 ("habanalabs: make sure device mem alloc is page aligned")
> 
> at kernel.org/palmer/habana , if that helps any.  No big deal if it goes in
> another way, it's just nice to keep allyesconfig building on my branches
> directly.

Looks like Guenter sent in a "more complete" version of this.  I'll
queue it up to my tree and get it to Linus for -rc2.

thanks,
greg k-h