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Date:	Thu, 14 Jun 2012 09:49:02 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Dave Chinner <dchinner@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	xfs@....sgi.com
Subject: [PATCH] mm: add gfp_mask parameter to vm_map_ram()

On Thu, Jun 14, 2012 at 11:20:26AM +1000, Dave Chinner wrote:
> On Wed, Jun 13, 2012 at 08:39:32PM +0800, Fengguang Wu wrote:
> > Hi Christoph, Dave,
> > 
> > I got this lockdep warning on XFS when running the xfs tests:
> > 
> > [  704.832019] =================================
> > [  704.832019] [ INFO: inconsistent lock state ]
> > [  704.832019] 3.5.0-rc1+ #8 Tainted: G        W   
> > [  704.832019] ---------------------------------
> > [  704.832019] inconsistent {IN-RECLAIM_FS-W} -> {RECLAIM_FS-ON-W} usage.
> > [  704.832019] fsstress/11619 [HC0[0]:SC0[0]:HE1:SE1] takes:
> > [  704.832019]  (&(&ip->i_lock)->mr_lock){++++?.}, at: [<ffffffff8143953d>] xfs_ilock_nowait+0xd7/0x1d0
> > [  704.832019] {IN-RECLAIM_FS-W} state was registered at:
> > [  704.832019]   [<ffffffff810e30a2>] mark_irqflags+0x12d/0x13e
> > [  704.832019]   [<ffffffff810e32f6>] __lock_acquire+0x243/0x3f9
> > [  704.832019]   [<ffffffff810e3a1c>] lock_acquire+0x112/0x13d
> > [  704.832019]   [<ffffffff810b8931>] down_write_nested+0x54/0x8b
> > [  704.832019]   [<ffffffff81438fab>] xfs_ilock+0xd8/0x17d
> > [  704.832019]   [<ffffffff814431b8>] xfs_reclaim_inode+0x4a/0x2cb
> > [  704.832019]   [<ffffffff814435ee>] xfs_reclaim_inodes_ag+0x1b5/0x28e
> > [  704.832019]   [<ffffffff814437d7>] xfs_reclaim_inodes_nr+0x33/0x3a
> > [  704.832019]   [<ffffffff8144050e>] xfs_fs_free_cached_objects+0x15/0x17
> > [  704.832019]   [<ffffffff81196076>] prune_super+0x103/0x154
> > [  704.832019]   [<ffffffff81152fa7>] shrink_slab+0x1ec/0x316
> > [  704.832019]   [<ffffffff8115574f>] balance_pgdat+0x308/0x618
> > [  704.832019]   [<ffffffff81155c22>] kswapd+0x1c3/0x1dc
> > [  704.832019]   [<ffffffff810b3f77>] kthread+0xaf/0xb7
> > [  704.832019]   [<ffffffff82f480b4>] kernel_thread_helper+0x4/0x10
> 
> ......
> > [  704.832019] stack backtrace:
> > [  704.832019] Pid: 11619, comm: fsstress Tainted: G        W    3.5.0-rc1+ #8
> > [  704.832019] Call Trace:
> > [  704.832019]  [<ffffffff82e92243>] print_usage_bug+0x1f5/0x206
> > [  704.832019]  [<ffffffff810e2220>] ? check_usage_forwards+0xa6/0xa6
> > [  704.832019]  [<ffffffff82e922c3>] mark_lock_irq+0x6f/0x120
> > [  704.832019]  [<ffffffff810e2f02>] mark_lock+0xaf/0x122
> > [  704.832019]  [<ffffffff810e3d4e>] mark_held_locks+0x6d/0x95
> > [  704.832019]  [<ffffffff810c5cd1>] ? local_clock+0x36/0x4d
> > [  704.832019]  [<ffffffff810e3de3>] __lockdep_trace_alloc+0x6d/0x6f
> > [  704.832019]  [<ffffffff810e42e7>] lockdep_trace_alloc+0x3d/0x57
> > [  704.832019]  [<ffffffff811837c8>] kmem_cache_alloc_node_trace+0x47/0x1b4
> > [  704.832019]  [<ffffffff810e377d>] ? lock_release_nested+0x9f/0xa6
> > [  704.832019]  [<ffffffff81431650>] ? _xfs_buf_find+0xaa/0x302
> > [  704.832019]  [<ffffffff811710a2>] ? new_vmap_block.constprop.18+0x3a/0x1de
> > [  704.832019]  [<ffffffff811710a2>] new_vmap_block.constprop.18+0x3a/0x1de
> > [  704.832019]  [<ffffffff8117144a>] vb_alloc.constprop.16+0x204/0x225
> > [  704.832019]  [<ffffffff8117149d>] vm_map_ram+0x32/0xaa
> > [  704.832019]  [<ffffffff81430c95>] _xfs_buf_map_pages+0xb3/0xf5
> > [  704.832019]  [<ffffffff81431a6a>] xfs_buf_get+0xd3/0x1ac
> > [  704.832019]  [<ffffffff81492dd9>] xfs_trans_get_buf+0x180/0x244
> > [  704.832019]  [<ffffffff8146947a>] xfs_da_do_buf+0x2a0/0x5cc
> > [  704.832019]  [<ffffffff81469826>] xfs_da_get_buf+0x21/0x23
> > [  704.832019]  [<ffffffff8146f894>] xfs_dir2_data_init+0x44/0xf9
> > [  704.832019]  [<ffffffff8146e94f>] xfs_dir2_sf_to_block+0x1ef/0x5d8
> 
> Bug in vm_map_ram - it does an unconditional GFP_KERNEL allocation
> here, and we are in a GFP_NOFS context. We can't pass a gfp_mask to
> vm_map_ram(), so until vm_map_ram() grows that we can't fix it...

This trivial patch should fix it.

The only behavior change is the XFS part:

@@ -406,7 +406,7 @@ _xfs_buf_map_pages(
 
                do {
                        bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count,
-                                               -1, PAGE_KERNEL);
+                                               -1, GFP_NOFS, PAGE_KERNEL);
                        if (bp->b_addr)
                                break;
                        vm_unmap_aliases();

Does that look fine to you?

Thanks,
Fengguang
---

>From 7301975d3211da2ce07723c294cf3260229fe84b Mon Sep 17 00:00:00 2001
From: Fengguang Wu <fengguang.wu@...el.com>
Date: Thu, 14 Jun 2012 09:38:33 +0800
Subject: [PATCH] mm: add @gfp_mask parameter to vm_map_ram()

XFS needs GFP_NOFS allocation.

Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
---
 drivers/firewire/ohci.c                 |    2 +-
 drivers/media/video/videobuf2-dma-sg.c  |    1 +
 drivers/media/video/videobuf2-vmalloc.c |    2 +-
 fs/xfs/xfs_buf.c                        |    2 +-
 include/linux/vmalloc.h                 |    2 +-
 mm/nommu.c                              |    3 ++-
 mm/vmalloc.c                            |    7 ++++---
 7 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index c1af05e..b53f5a9 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -1000,7 +1000,7 @@ static int ar_context_init(struct ar_context *ctx, struct fw_ohci *ohci,
 	for (i = 0; i < AR_WRAPAROUND_PAGES; i++)
 		pages[AR_BUFFERS + i] = ctx->pages[i];
 	ctx->buffer = vm_map_ram(pages, AR_BUFFERS + AR_WRAPAROUND_PAGES,
-				 -1, PAGE_KERNEL);
+				 -1, GFP_KERNEL, PAGE_KERNEL);
 	if (!ctx->buffer)
 		goto out_of_memory;
 
diff --git a/drivers/media/video/videobuf2-dma-sg.c b/drivers/media/video/videobuf2-dma-sg.c
index 25c3b36..d087f52 100644
--- a/drivers/media/video/videobuf2-dma-sg.c
+++ b/drivers/media/video/videobuf2-dma-sg.c
@@ -209,6 +209,7 @@ static void *vb2_dma_sg_vaddr(void *buf_priv)
 		buf->vaddr = vm_map_ram(buf->pages,
 					buf->sg_desc.num_pages,
 					-1,
+					GFP_KERNEL,
 					PAGE_KERNEL);
 
 	/* add offset in case userptr is not page-aligned */
diff --git a/drivers/media/video/videobuf2-vmalloc.c b/drivers/media/video/videobuf2-vmalloc.c
index 6b5ca6c..548ebda 100644
--- a/drivers/media/video/videobuf2-vmalloc.c
+++ b/drivers/media/video/videobuf2-vmalloc.c
@@ -111,7 +111,7 @@ static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr,
 			goto fail_get_user_pages;
 
 		buf->vaddr = vm_map_ram(buf->pages, buf->n_pages, -1,
-					PAGE_KERNEL);
+					GFP_KERNEL, PAGE_KERNEL);
 		if (!buf->vaddr)
 			goto fail_get_user_pages;
 	}
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 172d3cc..b3e7289 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -406,7 +406,7 @@ _xfs_buf_map_pages(
 
 		do {
 			bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count,
-						-1, PAGE_KERNEL);
+						-1, GFP_NOFS, PAGE_KERNEL);
 			if (bp->b_addr)
 				break;
 			vm_unmap_aliases();
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index dcdfc2b..c811763 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -40,7 +40,7 @@ struct vm_struct {
  */
 extern void vm_unmap_ram(const void *mem, unsigned int count);
 extern void *vm_map_ram(struct page **pages, unsigned int count,
-				int node, pgprot_t prot);
+				int node, gfp_t gfp_mask, pgprot_t prot);
 extern void vm_unmap_aliases(void);
 
 #ifdef CONFIG_MMU
diff --git a/mm/nommu.c b/mm/nommu.c
index d4b0c10..2fb4ec1 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -416,7 +416,8 @@ void vunmap(const void *addr)
 }
 EXPORT_SYMBOL(vunmap);
 
-void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot)
+void *vm_map_ram(struct page **pages, unsigned int count,
+		 int node, gfp_t gfp_mask, pgprot_t prot)
 {
 	BUG();
 	return NULL;
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 2aad499..3f736d1 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1088,21 +1088,22 @@ EXPORT_SYMBOL(vm_unmap_ram);
  *
  * Returns: a pointer to the address that has been mapped, or %NULL on failure
  */
-void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot)
+void *vm_map_ram(struct page **pages, unsigned int count,
+		 int node, gfp_t gfp_mask, pgprot_t prot)
 {
 	unsigned long size = count << PAGE_SHIFT;
 	unsigned long addr;
 	void *mem;
 
 	if (likely(count <= VMAP_MAX_ALLOC)) {
-		mem = vb_alloc(size, GFP_KERNEL);
+		mem = vb_alloc(size, gfp_mask);
 		if (IS_ERR(mem))
 			return NULL;
 		addr = (unsigned long)mem;
 	} else {
 		struct vmap_area *va;
 		va = alloc_vmap_area(size, PAGE_SIZE,
-				VMALLOC_START, VMALLOC_END, node, GFP_KERNEL);
+				VMALLOC_START, VMALLOC_END, node, gfp_mask);
 		if (IS_ERR(va))
 			return NULL;
 
-- 
1.7.10

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