linux-kernel - Re: [PATCH v2] riscv: mm: fix NOCACHE_THEAD does not set bit[61] correctly

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Message-ID: <mhng-4faa415d-93d9-46fc-b2f3-3b08c0de28ee@palmer-ri-x1c9a>
Date: Thu, 22 Feb 2024 12:22:51 -0800 (PST)
From: Palmer Dabbelt <palmer@...belt.com>
To: alexghiti@...osinc.com
CC: cyy@...self.name, linux-riscv@...ts.infradead.org, jszhang@...nel.org,
  Paul Walmsley <paul.walmsley@...ive.com>, guoren@...nel.org, linux-kernel@...r.kernel.org
Subject:     Re: [PATCH v2] riscv: mm: fix NOCACHE_THEAD does not set bit[61] correctly

On Wed, 21 Feb 2024 06:00:49 PST (-0800), alexghiti@...osinc.com wrote:
> Hi Yangyu,
>
> On Wed, Feb 21, 2024 at 4:04 AM Yangyu Chen <cyy@...self.name> wrote:
>>
>> Previous commit dbfbda3bd6bf ("riscv: mm: update T-Head memory type
>> definitions") from patch [1] missed a `<` for bit shifting, result in
>> bit(61) does not set in _PAGE_NOCACHE_THEAD and leaves bit(0) set instead.
>> This patch get this fixed.
>>
>> Changes since v1:
>> * reword commit message and add reviewed-by
>>
>> Link: https://lore.kernel.org/linux-riscv/20230912072510.2510-1-jszhang@kernel.org/ [1]
>> Fixes: dbfbda3bd6bf ("riscv: mm: update T-Head memory type definitions")
>> Signed-off-by: Yangyu Chen <cyy@...self.name>
>> Reviewed-by: Guo Ren <guoren@...nel.org>
>> Reviewed-by: Jisheng Zhang <jszhang@...nel.org>
>> ---
>>  arch/riscv/include/asm/pgtable-64.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
>> index b42017d76924..b99bd66107a6 100644
>> --- a/arch/riscv/include/asm/pgtable-64.h
>> +++ b/arch/riscv/include/asm/pgtable-64.h
>> @@ -136,7 +136,7 @@ enum napot_cont_order {
>>   * 10010 - IO   Strongly-ordered, Non-cacheable, Non-bufferable, Shareable, Non-trustable
>>   */
>>  #define _PAGE_PMA_THEAD                ((1UL << 62) | (1UL << 61) | (1UL << 60))
>> -#define _PAGE_NOCACHE_THEAD    ((1UL < 61) | (1UL << 60))
>> +#define _PAGE_NOCACHE_THEAD    ((1UL << 61) | (1UL << 60))
>>  #define _PAGE_IO_THEAD         ((1UL << 63) | (1UL << 60))
>>  #define _PAGE_MTMASK_THEAD     (_PAGE_PMA_THEAD | _PAGE_IO_THEAD | (1UL << 59))
>>
>> --
>> 2.43.0
>>
>
> I feel pretty confident on this one :)

Ya, sorry I missed it the first time around -- that's a bit embarassing 
;).  It should show up on fixes soon, just queued up behind some other 
patches but the tester is back alive so thing should be sane again.

> Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
>
> Thanks,
>
> Alex