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From: Christoph Hellwig <hch@infradead.org>
To: Guo Ren <guoren@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>,
	Anup Patel <anup.patel@wdc.com>,
	Palmer Dabbelt <palmerdabbelt@google.com>,
	Arnd Bergmann <arnd@arndb.de>,
	linux-riscv <linux-riscv@lists.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-arch <linux-arch@vger.kernel.org>,
	linux-sunxi@lists.linux.dev, Guo Ren <guoren@linux.alibaba.com>
Subject: Re: [PATCH 2/3] riscv: Fixup PAGE_UP in asm/page.h
Date: Tue, 25 May 2021 10:34:37 +0100	[thread overview]
Message-ID: <YKzErU3lpFO58hkY@infradead.org> (raw)
In-Reply-To: <CAJF2gTRA=tUid7akgVXfk6MHOd0KmJpDQEZ2m9wRfhigBDzQTw@mail.gmail.com>

On Tue, May 25, 2021 at 05:28:21PM +0800, Guo Ren wrote:
> On Tue, May 25, 2021 at 2:34 PM Christoph Hellwig <hch@infradead.org> wrote:
> >
> > On Mon, May 24, 2021 at 06:51:07AM +0000, guoren@kernel.org wrote:
> > > From: Guo Ren <guoren@linux.alibaba.com>
> > >
> > > Current PAGE_UP implementation is wrong. PAGE_UP(0) should be
> > > 0x1000, but current implementation will give out 0.
> > >
> > > Although the current PAGE_UP isn't used, it will soon be used in
> > > tlb_flush optimization.
> >
> > Nak.  Please just remove the PAGE_UP/PAGE_DOWN macros just like they
> > have been removed from other architectures long ago and use the
> > generic DIV_ROUND_UP macro for your new code like everyone else.
> 
> This patch has been dropped because it's wrong, ref Anup's reply.
> 
> Remove PAGE_UP/DOWN is okay for me. How about:
>  static inline void local_flush_tlb_range_asid(unsigned long start,
> unsigned long size,
>                                               unsigned long asid)
>  {
> -       unsigned long page_add = PAGE_DOWN(start);
> -       unsigned long page_end = PAGE_UP(start + size);
> +       unsigned long page_add = _ALIGN_DOWN(start, PAGE_SIZE);
> +       unsigned long page_end = _ALIGN_UP(start + size, PAGE_SIZE);
> 
> _ALIGN_XXX are also defined in arch/riscv/include/asm/page.h.

And these also are leftovers from days gone by and should be removed.

I think this should simply be:

	
	unsigned long page_add = start & PAGE_MASK;
	unsigned long page_end = PAGE_ALIGN(start + size);

(and page_add is a pretty horrible name as well..)

  reply	other threads:[~2021-05-25  9:35 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-24  6:51 [PATCH 1/3] riscv: Fixup _PAGE_GLOBAL in _PAGE_KERNEL guoren
2021-05-24  6:51 ` [PATCH 2/3] riscv: Fixup PAGE_UP in asm/page.h guoren
2021-05-25  6:34   ` Christoph Hellwig
2021-05-25  9:28     ` Guo Ren
2021-05-25  9:34       ` Christoph Hellwig [this message]
2021-05-24  6:51 ` [PATCH 3/3] riscv: Use use_asid_allocator flush TLB guoren
2021-05-24  8:13   ` Anup Patel
2021-05-24  8:03 ` [PATCH 1/3] riscv: Fixup _PAGE_GLOBAL in _PAGE_KERNEL Anup Patel
2021-05-24  8:22   ` Guo Ren
2021-05-24 10:42 ` Anup Patel
2021-05-24 12:01   ` Guo Ren

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