linux-kernel - Re: [PATCH 2/3] riscv: Fixup PAGE

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Date:   Tue, 25 May 2021 17:28:21 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Anup Patel <anup.patel@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-sunxi@...ts.linux.dev, Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH 2/3] riscv: Fixup PAGE_UP in asm/page.h

On Tue, May 25, 2021 at 2:34 PM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Mon, May 24, 2021 at 06:51:07AM +0000, guoren@...nel.org wrote:
> > From: Guo Ren <guoren@...ux.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.

-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/