On 11/17/2015 11:19 AM, Oleg Nesterov wrote:
On 11/16, Piotr Kwapulinski wrote:@@ -1551,7 +1552,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr, * MAP_FIXED may remove pages of mappings that intersects with * requested mapping. Account for the pages it would unmap. */ - if (!(vm_flags & MAP_FIXED)) + if (!(flags & MAP_FIXED)) return -ENOMEM;And afaics arch/tile/mm/elf.c can use do_mmap(MAP_FIXED ...) rather than mmap_region(), it can be changed by a separate patch. In this case we can unexport mmap_region().
The problem is that we are mapping a region of virtual address space that the chip provides for setting up interrupt handlers (at 0xfc000000) but that is above the TASK_SIZE cutoff, so do_mmap() would fail the call in get_unmapped_area(). -- Chris Metcalf, EZChip Semiconductor http://www.ezchip.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
