Subject: [PATCH v2 3/3] powerpc/mm/hugetlb: Don't enable HugeTLB if we don't have a page table cache

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Tue, 28 May 2019 11:06:26 +0530

This makes sure we don't enable HugeTLB if the cache is not configured.
I am still not sure about this. IMHO hugetlb support should be a hardware
support derivative and any cache allocation failure should be handled as I did
in the earlier patch. But then if we were not able to create hugetlb page table
cache, we can as well declare hugetlb support disabled thereby avoiding calling
into allocation routines.

Signed-off-by: Aneesh Kumar K.V <[email-masked]>
---
 arch/powerpc/mm/hugetlbpage.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index f55dc110f2ad..d34540479b1a 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -601,6 +601,7 @@ __setup("hugepagesz=", hugepage_setup_sz);
 
 static int __init hugetlbpage_init(void)
 {
+	bool configured = false;
 	int psize;
 
 	if (hugetlb_disabled) {
@@ -651,10 +652,15 @@ static int __init hugetlbpage_init(void)
 			pgtable_cache_add(pdshift - shift);
 		else if (IS_ENABLED(CONFIG_PPC_FSL_BOOK3E) || IS_ENABLED(CONFIG_PPC_8xx))
 			pgtable_cache_add(PTE_T_ORDER);
+
+		configured = true;
 	}
 
-	if (IS_ENABLED(CONFIG_HUGETLB_PAGE_SIZE_VARIABLE))
-		hugetlbpage_init_default();
+	if (configured) {
+		if (IS_ENABLED(CONFIG_HUGETLB_PAGE_SIZE_VARIABLE))
+			hugetlbpage_init_default();
+	} else
+		pr_info("Failed to initialize. Disabling HugeTLB");
 
 	return 0;
 }
-- 
2.21.0