Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752588AbdHPWHX (ORCPT ); Wed, 16 Aug 2017 18:07:23 -0400 Received: from mail-qk0-f170.google.com ([209.85.220.170]:34818 "EHLO mail-qk0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752266AbdHPWHW (ORCPT ); Wed, 16 Aug 2017 18:07:22 -0400 From: Laura Abbott To: Andrew Morton , Michal Hocko , Vlastimil Babka , "Kirill A. Shutemov" Cc: Laura Abbott , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH] mm/vmalloc: Don't unconditonally use __GFP_HIGHMEM Date: Wed, 16 Aug 2017 15:07:05 -0700 Message-Id: <20170816220705.31374-1-labbott@redhat.com> X-Mailer: git-send-email 2.13.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2381 Lines: 61 Commit 19809c2da28a ("mm, vmalloc: use __GFP_HIGHMEM implicitly") added use of __GFP_HIGHMEM for allocations. vmalloc_32 may use GFP_DMA/GFP_DMA32 which does not play nice with __GFP_HIGHMEM and will drigger a BUG in gfp_zone. Only add __GFP_HIGHMEM if we aren't using GFP_DMA/GFP_DMA32. Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1482249 Fixes: 19809c2da28a ("mm, vmalloc: use __GFP_HIGHMEM implicitly") Signed-off-by: Laura Abbott --- mm/vmalloc.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 8698c1c86c4d..a47e3894c775 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1671,7 +1671,10 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, struct page **pages; unsigned int nr_pages, array_size, i; const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO; - const gfp_t alloc_mask = gfp_mask | __GFP_HIGHMEM | __GFP_NOWARN; + const gfp_t alloc_mask = gfp_mask | __GFP_NOWARN; + const gfp_t highmem_mask = (gfp_mask & (GFP_DMA | GFP_DMA32)) ? + 0 : + __GFP_HIGHMEM; nr_pages = get_vm_area_size(area) >> PAGE_SHIFT; array_size = (nr_pages * sizeof(struct page *)); @@ -1679,7 +1682,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, area->nr_pages = nr_pages; /* Please note that the recursion is strictly bounded. */ if (array_size > PAGE_SIZE) { - pages = __vmalloc_node(array_size, 1, nested_gfp|__GFP_HIGHMEM, + pages = __vmalloc_node(array_size, 1, nested_gfp|highmem_mask, PAGE_KERNEL, node, area->caller); } else { pages = kmalloc_node(array_size, nested_gfp, node); @@ -1700,9 +1703,9 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, } if (node == NUMA_NO_NODE) - page = alloc_page(alloc_mask); + page = alloc_page(alloc_mask|highmem_mask); else - page = alloc_pages_node(node, alloc_mask, 0); + page = alloc_pages_node(node, alloc_mask|highmem_mask, 0); if (unlikely(!page)) { /* Successfully allocated i pages, free them in __vunmap() */ @@ -1710,7 +1713,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, goto fail; } area->pages[i] = page; - if (gfpflags_allow_blocking(gfp_mask)) + if (gfpflags_allow_blocking(gfp_mask|highmem_mask)) cond_resched(); } -- 2.13.0