From 5ed0f130bfd7a7e2e8e60b08d9e35e60cfd17c60 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Mon, 1 Jul 2019 20:03:38 +0530 Subject: [PATCH] powerpc/mm/nvdimm: Add an informative message if we fail to allocate altmap block Allocation from altmap area can fail based on vmemmap page size used. Add kernel info message to indicate the failure. That allows the user to identify whether they are really using persistent memory reserved space for per-page metadata. The message looks like: [ 136.587212] altmap block allocation failed, falling back to system memory Signed-off-by: Aneesh Kumar K.V Reviewed-by: Oliver O'Halloran Signed-off-by: Michael Ellerman --- arch/powerpc/mm/init_64.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index 45b02fa11cd81..b219160a5b1a4 100644 --- a/arch/powerpc/mm/init_64.c +++ b/arch/powerpc/mm/init_64.c @@ -199,8 +199,11 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, * fail due to alignment issues when using 16MB hugepages, so * fall back to system memory if the altmap allocation fail. */ - if (altmap) + if (altmap) { p = altmap_alloc_block_buf(page_size, altmap); + if (!p) + pr_debug("altmap block allocation failed, falling back to system memory"); + } if (!p) p = vmemmap_alloc_block_buf(page_size, node); if (!p) -- 2.39.5