On Thu 22-12-16 14:18:54, Ross Zwisler wrote:
> Add a pmdp_huge_clear_flush() stub for configs that don't define
> CONFIG_TRANSPARENT_HUGEPAGE.
>
> We use a WARN_ON_ONCE() instead of a BUILD_BUG() because in the DAX code at
> least we do want this compile successfully even for configs without
> CONFIG_TRANSPARENT_HUGEPAGE. It'll be a runtime decision whether we call
> this code gets called, based on whether we find DAX PMD entries in our
> tree. We shouldn't ever find such PMD entries for
> !CONFIG_TRANSPARENT_HUGEPAGE configs, so this function should never be
> called.
>
> Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Looks good. You can add:
Reviewed-by: Jan Kara <jack@xxxxxxx>
Honza
> ---
> include/asm-generic/pgtable.h | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
> index 18af2bc..65e9536 100644
> --- a/include/asm-generic/pgtable.h
> +++ b/include/asm-generic/pgtable.h
> @@ -178,9 +178,19 @@ extern pte_t ptep_clear_flush(struct vm_area_struct *vma,
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> extern pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
> unsigned long address,
> pmd_t *pmdp);
> +#else
> +static inline pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
> + unsigned long address,
> + pmd_t *pmdp)
> +{
> + WARN_ON_ONCE(1);
> + return *pmdp;
> +}
> +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
> --
> 2.7.4
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
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