[PATCH v2 04/13] mm/debug_vm_pgtables/hugevmap: Use the arch helper to identify huge vmap support.

[Anshuman Khandual]

On 08/19/2020 06:30 PM, Aneesh Kumar K.V wrote:
> ppc64 supports huge vmap only with radix translation. Hence use arch helper
> to determine the huge vmap support.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>
> ---
>  include/linux/io.h    | 12 ++++++++++++
>  mm/debug_vm_pgtable.c |  4 ++--
>  2 files changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/io.h b/include/linux/io.h
> index 8394c56babc2..0b1ecda0cc86 100644
> --- a/include/linux/io.h
> +++ b/include/linux/io.h
> @@ -38,6 +38,18 @@ int arch_ioremap_pud_supported(void);
>  int arch_ioremap_pmd_supported(void);
>  #else
>  static inline void ioremap_huge_init(void) { }
> +static inline int arch_ioremap_p4d_supported(void)
> +{
> +	return false;
> +}
> +static inline int arch_ioremap_pud_supported(void)
> +{
> +	return false;
> +}
> +static inline int arch_ioremap_pmd_supported(void)
> +{
> +	return false;
> +}
>  #endif
>  
>  /*
> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
> index 57259e2dbd17..cf3c4792b4a2 100644
> --- a/mm/debug_vm_pgtable.c
> +++ b/mm/debug_vm_pgtable.c

This would need an explicit inclusion of <linux/io.h> in order
to prevent build failure in some cases.

> @@ -206,7 +206,7 @@ static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
>  {
>  	pmd_t pmd;
>  
> -	if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP))
> +	if (!arch_ioremap_pmd_supported())
>  		return;
>  
>  	pr_debug("Validating PMD huge\n");
> @@ -320,7 +320,7 @@ static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
>  {
>  	pud_t pud;
>  
> -	if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP))
> +	if (!arch_ioremap_pud_supported())
>  		return;
>  
>  	pr_debug("Validating PUD huge\n");
>