Re: [PATCH 13/14] mm: mempolicy: Check return code of check_range

[David Rientjes]

On Mon, 6 Sep 2010, KOSAKI Motohiro wrote:

> > From: Vasiliy Kulikov <segooon@xxxxxxxxx>
> > 
> > Function check_range may return ERR_PTR(...). Check for it.
> 
> When happen this issue?
> 
> afaik, check_range return error when following condition.
>  1) mm->mmap->vm_start argument is incorrect
>  2) don't have neigher MPOL_MF_STATS, MPOL_MF_MOVE and MPOL_MF_MOVE_ALL
> 
> I think both case is not happen in real. Am I overlooking anything?
> 

There's no reason not to check the return value of a function when the 
implementation of either could change at any time.  migrate_to_node() is 
certainly not in any fastpath where we can't sacrifice a branch for more 
robust code.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/