linux-kernel - Re: [PATCH] habanalabs: Elide a warning on 32-bit targets

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Message-ID: <CAFCwf13-o=kUR61xjWt=F-Q-Vfy=kF6fpMP7iB+83Gfqw7+2HA@mail.gmail.com>
Date:   Fri, 1 Apr 2022 21:13:48 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     Palmer Dabbelt <palmer@...osinc.com>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-riscv@...ts.infradead.org, Arnd Bergmann <arnd@...db.de>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        Ohad Sharabi <osharabi@...ana.ai>
Subject: Re: [PATCH] habanalabs: Elide a warning on 32-bit targets

On Fri, Apr 1, 2022 at 7:41 PM Palmer Dabbelt <palmer@...osinc.com> wrote:
>
> From: Palmer Dabbelt <palmer@...osinc.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@...osinc.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@...nel.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,
Oded