Architectures like powerpc would like to enable transparent huge page pud
support only with radix translation. To support that add
has_transparent_pud_hugepage() helper that architectures can override.
Reviewed-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
---
drivers/nvdimm/pfn_devs.c | 2 +-
include/linux/pgtable.h | 3 +++
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index af7d9301520c..18ad315581ca 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -100,7 +100,7 @@ static unsigned long *nd_pfn_supported_alignments(unsigned long *alignments)
if (has_transparent_hugepage()) {
alignments[1] = HPAGE_PMD_SIZE;
- if (IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD))
+ if (has_transparent_pud_hugepage())
alignments[2] = HPAGE_PUD_SIZE;
}
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 5063b482e34f..cf13f8d938a8 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -1499,6 +1499,9 @@ typedef unsigned int pgtbl_mod_mask;
#define has_transparent_hugepage() IS_BUILTIN(CONFIG_TRANSPARENT_HUGEPAGE)
#endif
+#ifndef has_transparent_pud_hugepage
+#define has_transparent_pud_hugepage() IS_BUILTIN(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
+#endif
/*
* On some architectures it depends on the mm if the p4d/pud or pmd
* layer of the page table hierarchy is folded or not.
--
2.41.0
