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SubjectRe: [PATCH v6 10/18] sh/tlb: Convert SH to generic mmu_gather
Hoi Peter,

On Wed, Dec 4, 2019 at 11:48 AM Peter Zijlstra <peterz@infradead.org> wrote:
> On Tue, Dec 03, 2019 at 12:19:00PM +0100, Geert Uytterhoeven wrote:
> > On Tue, Feb 19, 2019 at 11:35 AM Peter Zijlstra <peterz@infradead.org> wrote:
> > > Generic mmu_gather provides everything SH needs (range tracking and
> > > cache coherency).
> > >
> > > Cc: Will Deacon <will.deacon@arm.com>
> > > Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
> > > Cc: Andrew Morton <akpm@linux-foundation.org>
> > > Cc: Nick Piggin <npiggin@gmail.com>
> > > Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
> > > Cc: Rich Felker <dalias@libc.org>
> > > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> >
> > I got remote access to an SH7722-based Migo-R again, which spews a long
> > sequence of BUGs during userspace startup. I've bisected this to commit
> > c5b27a889da92f4a ("sh/tlb: Convert SH to generic mmu_gather").
>
> Whoopsy.. also, is this really the first time anybody booted an SH
> kernel in over a year ?!?

Nah, but the v5.4-rc3 I booted recently on qemu -M r2d had
CONFIG_PGTABLE_LEVELS=2, so it didn't show the problem.

> > Do you have a clue?
>
> Does the below help?

Unfortunately not.

> diff --git a/arch/sh/include/asm/pgalloc.h b/arch/sh/include/asm/pgalloc.h
> index 22d968bfe9bb..73a2c00de6c5 100644
> --- a/arch/sh/include/asm/pgalloc.h
> +++ b/arch/sh/include/asm/pgalloc.h
> @@ -36,9 +36,8 @@ do { \
> #if CONFIG_PGTABLE_LEVELS > 2
> #define __pmd_free_tlb(tlb, pmdp, addr) \
> do { \
> - struct page *page = virt_to_page(pmdp); \
> - pgtable_pmd_page_dtor(page); \
> - tlb_remove_page((tlb), page); \
> + pgtable_pmd_page_dtor(pmdp); \

expected ‘struct page *’ but argument is of type ‘pmd_t * {aka struct
<anonymous> *}’

> + tlb_remove_page((tlb), (pmdp)); \

likewise

> } while (0);
> #endif

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

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