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

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Date:   Fri, 01 Apr 2022 11:36:53 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     ogabbay@...nel.org
CC:     Greg KH <gregkh@...uxfoundation.org>,
        linux-riscv@...ts.infradead.org, Arnd Bergmann <arnd@...db.de>,
        linux-kernel@...r.kernel.org, osharabi@...ana.ai
Subject:     Re: [PATCH] habanalabs: Elide a warning on 32-bit targets

On Fri, 01 Apr 2022 11:13:48 PDT (-0700), ogabbay@...nel.org wrote:
> 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.

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.