Messages in this thread | | | Subject | Re: [PATCH] mm/mapping_dirty_helpers: Guard hugepage pud's usage | From | Thomas Hellström (Intel) <> | Date | Fri, 9 Apr 2021 09:43:32 +0200 |
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On 4/8/21 9:15 PM, Zack Rusin wrote: > Lets make sure we don't use pud hugepage helpers on architectures > which do not support it. This fixes the code on arm64. nits:
Perhaps be a little more specific about what it fixes? I figure it's a compilation failure? Also please use imperative form: "Fix the code arm64" rather than "This fixes the code on arm64"
Other than that LGTM.
Reviewed-by: Thomas Hellström (Intel) <thomas_os@shipmail.org>
> > Signed-off-by: Zack Rusin <zackr@vmware.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: Thomas Hellström (Intel) <thomas_os@shipmail.org> > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > --- > mm/mapping_dirty_helpers.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/mm/mapping_dirty_helpers.c b/mm/mapping_dirty_helpers.c > index b59054ef2e10..b890854ec761 100644 > --- a/mm/mapping_dirty_helpers.c > +++ b/mm/mapping_dirty_helpers.c > @@ -165,10 +165,12 @@ static int wp_clean_pud_entry(pud_t *pud, unsigned long addr, unsigned long end, > return 0; > } > > +#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD > /* Huge pud */ > walk->action = ACTION_CONTINUE; > if (pud_trans_huge(pudval) || pud_devmap(pudval)) > WARN_ON(pud_write(pudval) || pud_dirty(pudval)); > +#endif > > return 0; > }
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