On 11/17, 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; > > Agree, "vm_flags & MAP_FIXED" makes no sense and just wrong... > > Can't we simply remove this check? Afaics it only helps to avoid > count_vma_pages_range() in the unlikely case when may_expand_vm() fails. > And without MAP_FIXED count_vma_pages_range() should be cheap, > find_vma_intersection() should fail.
Or we can simply move this may_expand_vm() block to the caller, do_mmap(). > 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(). > > OTOH, I won't insist, this patch looks fine to me. Yes, but what I actually tried to say is that it would be nice to unexport mmap_region(), arch/tile is the only caller outside of mmap.c. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
