Hi Fengguang, On 06/14/2012 10:49 AM, Fengguang Wu wrote: > 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@xxxxxxxxx> > 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@xxxxxxxxx> > --- > 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; > It shouldn't work because vmap_page_range still can allocate GFP_KERNEL by pud_alloc in vmap_pud_range. For it, I tried [1] but other mm guys want to add WARNING [2] so let's avoiding gfp context passing. [1] https://lkml.org/lkml/2012/4/23/77 [2] https://lkml.org/lkml/2012/5/2/340 Thanks. -- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html