linux-kernel - [PATCH 08/10] mm: mark all calls into the vmalloc subsystem as potentially sleeping

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Date:   Fri, 18 Nov 2016 14:03:54 +0100
From:   Christoph Hellwig <hch@....de>
To:     akpm@...ux-foundation.org
Cc:     aryabinin@...tuozzo.com, joelaf@...gle.com, jszhang@...vell.com,
        chris@...is-wilson.co.uk, joaodias@...gle.com, linux-mm@...ck.org,
        linux-rt-users@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 08/10] mm: mark all calls into the vmalloc subsystem as potentially sleeping

We will take a sleeping lock in later in this series, so this adds the
proper safeguards.

Signed-off-by: Christoph Hellwig <hch@....de>
Tested-by: Jisheng Zhang <jszhang@...vell.com>
---
 mm/vmalloc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index e2030b4..25283af 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -365,7 +365,7 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
 	BUG_ON(offset_in_page(size));
 	BUG_ON(!is_power_of_2(align));
 
-	might_sleep_if(gfpflags_allow_blocking(gfp_mask));
+	might_sleep();
 
 	va = kmalloc_node(sizeof(struct vmap_area),
 			gfp_mask & GFP_RECLAIM_MASK, node);
@@ -1037,6 +1037,8 @@ void vm_unmap_aliases(void)
 	if (unlikely(!vmap_initialized))
 		return;
 
+	might_sleep();
+
 	for_each_possible_cpu(cpu) {
 		struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);
 		struct vmap_block *vb;
@@ -1080,6 +1082,7 @@ void vm_unmap_ram(const void *mem, unsigned int count)
 	unsigned long addr = (unsigned long)mem;
 	struct vmap_area *va;
 
+	might_sleep();
 	BUG_ON(!addr);
 	BUG_ON(addr < VMALLOC_START);
 	BUG_ON(addr > VMALLOC_END);
@@ -1431,6 +1434,8 @@ struct vm_struct *remove_vm_area(const void *addr)
 {
 	struct vmap_area *va;
 
+	might_sleep();
+
 	va = find_vmap_area((unsigned long)addr);
 	if (va && va->flags & VM_VM_AREA) {
 		struct vm_struct *vm = va->vm;
-- 
2.1.4