Messages in this thread Patch in this message | | | Date | Fri, 14 Oct 2005 14:21:55 -0500 | From | Robin Holt <> | Subject | [Patch 1/3] Add a NOPAGE_FAULTED flag. |
| |
Introduce a NOPAGE_FAULTED flag. This flag is returned from a drivers nopage handler to indicate the desired pte has been inserted and should be handled as a minor fault.
Signed-off-by: holt@sgi.com
Index: linux-2.6/include/linux/mm.h =================================================================== --- linux-2.6.orig/include/linux/mm.h 2005-10-11 21:15:45.147011169 -0500 +++ linux-2.6/include/linux/mm.h 2005-10-11 21:17:15.814561844 -0500 @@ -619,6 +619,7 @@ static inline int page_mapped(struct pag */ #define NOPAGE_SIGBUS (NULL) #define NOPAGE_OOM ((struct page *) (-1)) +#define NOPAGE_FAULTED ((struct page *) (-2)) /* * Different kinds of faults, as returned by handle_mm_fault(). Index: linux-2.6/mm/memory.c =================================================================== --- linux-2.6.orig/mm/memory.c 2005-10-11 21:15:45.162634582 -0500 +++ linux-2.6/mm/memory.c 2005-10-11 21:17:15.849714525 -0500 @@ -1862,6 +1862,14 @@ retry: return VM_FAULT_SIGBUS; if (new_page == NOPAGE_OOM) return VM_FAULT_OOM; + if (new_page == NOPAGE_FAULTED) { + spin_lock(&mm->page_table_lock); + page_table = pte_offset_map(pmd, address); + pte_unmap(page_table); + spin_unlock(&mm->page_table_lock); + + return VM_FAULT_MINOR; + } /* * Should we do an early C-O-W break? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |