linux-kernel - Re: [PATCH] riscv: Fix wrong size passed to local_flush_tlb_range

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Date: Wed, 31 Jan 2024 12:34:40 -0800 (PST)
From: Palmer Dabbelt <palmer@...belt.com>
To: dennis@...nel.org
CC: alexghiti@...osinc.com, Paul Walmsley <paul.walmsley@...ive.com>,
  aou@...s.berkeley.edu, geert@...ux-m68k.org, linux-riscv@...ts.infradead.org,
  linux-kernel@...r.kernel.org
Subject:     Re: [PATCH] riscv: Fix wrong size passed to local_flush_tlb_range_asid()

On Mon, 29 Jan 2024 01:01:00 PST (-0800), dennis@...nel.org wrote:
> Hi Alexandre,
>
> On Tue, Jan 23, 2024 at 02:27:30PM +0100, Alexandre Ghiti wrote:
>> local_flush_tlb_range_asid() takes the size as argument, not the end of
>> the range to flush, so fix this by computing the size from the end and
>> the start of the range.
>>
>> Fixes: 7a92fc8b4d20 ("mm: Introduce flush_cache_vmap_early()")
>> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
>> ---
>>  arch/riscv/mm/tlbflush.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
>> index 8d12b26f5ac3..9619965f6501 100644
>> --- a/arch/riscv/mm/tlbflush.c
>> +++ b/arch/riscv/mm/tlbflush.c
>> @@ -68,7 +68,7 @@ static inline void local_flush_tlb_range_asid(unsigned long start,
>>
>>  void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
>>  {
>> -	local_flush_tlb_range_asid(start, end, PAGE_SIZE, FLUSH_TLB_NO_ASID);
>> +	local_flush_tlb_range_asid(start, end - start, PAGE_SIZE, FLUSH_TLB_NO_ASID);
>>  }
>>
>>  static void __ipi_flush_tlb_all(void *info)
>> --
>> 2.39.2
>>
>
> Sorry for the delay, I just pulled this into percpu#for-6.8-fixes. I'll
> send it to Linus this week.

Do you mind if we do a shared tag or something?  It's going to conflict 
with 
https://lore.kernel.org/all/20240117140333.2479667-1-vincent.chen@sifive.com/ 
  No big deal as it's a pretty trivial conflict, but they'll both need 
stable backports.

>
> Thanks,
> Dennis