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

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Date: Wed, 31 Jan 2024 19:45:27 -0800
From: Dennis Zhou <dennis@...nel.org>
To: Palmer Dabbelt <palmer@...belt.com>
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()

Hi Palmer,

On Wed, Jan 31, 2024 at 12:34:40PM -0800, Palmer Dabbelt wrote:
> 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.

This alone won't need a stable backport, I merged the bug as part of
enabling the percpu page allocator in the recent 6.8 merge window.

That being said, this is the only patch I'm carrying for v6.8. I'm happy
to drop it and have you pick it up instead. Saves me a tag and a PR.
Lmk if that works for you.

Thanks,
Dennis