[lkml]   [2007]   [Jun]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
SubjectRe: Oops in a driver while using SLUB as a SLAB allocator
Here is the corresponding PA-RISC piece. Its as straightforward as 
the other one since the only way to make this work properly in the past
was if the sizes passed to the dma alloc functions are page size based.

PA-RISC: Use page allocator instead of slab allocator.

Slab pages obtained via kmalloc are not cachline aligned. Nor is it advisable
to perform VM operations designed for page allocator pages on
memory obtained via kmalloc.

So replace the page sized allocations in kernel/pci-dma.c with page allocator

Signed-off-by: Christoph Lameter <>

arch/parisc/kernel/pci-dma.c | 4 ++--
include/linux/mm.h | 5 +----
2 files changed, 3 insertions(+), 6 deletions(-)

Index: linux-2.6/arch/parisc/kernel/pci-dma.c
--- linux-2.6.orig/arch/parisc/kernel/pci-dma.c 2007-06-22 13:02:32.000000000 -0700
+++ linux-2.6/arch/parisc/kernel/pci-dma.c 2007-06-22 13:06:39.000000000 -0700
@@ -572,7 +572,7 @@ static void *pa11_dma_alloc_noncoherent(
void *addr = NULL;

/* rely on kmalloc to be cacheline aligned */
- addr = kmalloc(size, flag);
+ addr = (void *)__get_free_pages(flag, get_order(size));
*dma_handle = (dma_addr_t)virt_to_phys(addr);

@@ -582,7 +582,7 @@ static void *pa11_dma_alloc_noncoherent(
static void pa11_dma_free_noncoherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t iova)
- kfree(vaddr);
+ free_pages((unsigned long)vaddr, get_order(size));

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-06-22 22:17    [W:0.123 / U:30.528 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site