diff options
| author | Jason Lunz <lunz@falooley.org> | 2007-03-29 01:20:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-29 08:22:24 -0700 |
| commit | af84eab208916acad91f6342bbd57bc865caf150 (patch) | |
| tree | 6c652d6f31e1eeaded81cc6a987da00ea203b78a /arch | |
| parent | 3076212f8d3d9fe4d7b11c6b560c0f424edfcb4e (diff) | |
| download | lwn-af84eab208916acad91f6342bbd57bc865caf150.tar.gz lwn-af84eab208916acad91f6342bbd57bc865caf150.zip | |
[PATCH] uml: fix LVM crash
Permit lvm to create logical volumes without crashing UML.
When device-mapper's DM_DEV_CREATE_CMD ioctl is called to create a new device,
dev_create()->dm_create()->alloc_dev()-> blk_queue_bounce_limit(md->queue,
BLK_BOUNCE_ANY) is called.
blk_queue_bounce_limit(BLK_BOUNCE_ANY) calls init_emergency_isa_pool() if
blk_max_pfn < blk_max_low_pfn. This is the case on UML, but
init_emergency_isa_pool() hits BUG_ON(!isa_page_pool) because there doesn't
seem to be a dma zone on UML for mempool_create() to allocate from.
Most architectures seem to have max_low_pfn == max_pfn, but UML doesn't
because of the uml_reserved chunk it keeps for itself. From what I can see,
max_pfn and max_low_pfn don't get much use after the bootmem-allocator stops
being used anyway, except that they initialize the block layer's
blk_max_low_pfn/blk_max_pfn.
This ensures init_emergency_isa_pool() doesn't crash uml in this situation by
setting max_low_pfn == max_pfn in mem_init().
Signed-off-by: Jason Lunz <lunz@falooley.org>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Alasdair G Kergon <agk@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/um/kernel/mem.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index e85d65deea0d..df7d662b98ce 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -64,8 +64,6 @@ static void setup_highmem(unsigned long highmem_start, void mem_init(void) { - max_low_pfn = (high_physmem - uml_physmem) >> PAGE_SHIFT; - /* clear the zero-page */ memset((void *) empty_zero_page, 0, PAGE_SIZE); @@ -80,6 +78,7 @@ void mem_init(void) /* this will put all low memory onto the freelists */ totalram_pages = free_all_bootmem(); + max_low_pfn = totalram_pages; #ifdef CONFIG_HIGHMEM totalhigh_pages = highmem >> PAGE_SHIFT; totalram_pages += totalhigh_pages; |