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authorCliff Wickman <cpw@sgi.com>2006-04-25 10:47:48 -0500
committerTony Luck <tony.luck@intel.com>2006-04-27 14:31:16 -0700
commit1df57c0c21c92a6d4fcfe5304c84151ed9beb7a2 (patch)
tree06a24df0fe9a149581d246aa547122b07dcb2dad
parentdd4cb9f8ac9717c9db2b2afc5a82cb95a3d5dec3 (diff)
[IA64] enable dumps to capture second page of kernel stack
In SLES10 (2.6.16) crash dumping (in my experience, LKCD) is unable to capture the second page of the 2-page task/stack allocation. This is particularly troublesome for dump analysis, as the stack traceback cannot be done. (A similar convention is probably needed throughout the kernel to make kernel multi-page allocations detectable for dumping) Multi-page kernel allocations are represented by the single page structure associated with the first page of the allocation. The page structures associated with the other pages are unintialized. If the dumper is selecting only kernel pages it has no way to identify any but the first page of the allocation. The fix is to make the task/stack allocation a compound page. Signed-off-by: Cliff Wickman <cpw@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
-rw-r--r--include/asm-ia64/thread_info.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-ia64/thread_info.h b/include/asm-ia64/thread_info.h
index 56394a2c705..e5392c4d30c 100644
--- a/include/asm-ia64/thread_info.h
+++ b/include/asm-ia64/thread_info.h
@@ -67,7 +67,7 @@ struct thread_info {
#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
-#define alloc_task_struct() ((task_t *)__get_free_pages(GFP_KERNEL, KERNEL_STACK_SIZE_ORDER))
+#define alloc_task_struct() ((task_t *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
#define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
#endif /* !__ASSEMBLY */