Messages in this thread | | | Date | Mon, 21 Jan 2013 19:27:52 +0900 | Subject | Re: [patch] f2fs: use _safe() version of list_for_each | From | Namjae Jeon <> |
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2013/1/21, Jaegeuk Kim <jaegeuk.kim@samsung.com>: > 2013-01-21 (월), 00:32 -0800, Dmitry Torokhov: >> On Sun, Jan 20, 2013 at 06:02:58PM +0300, Dan Carpenter wrote: >> > This is calling list_del() inside a loop which is a problem when we try >> > move to the next item on the list. I've converted it to use the _safe >> > version. And also, as a cleanup, I've converted it to use >> > list_for_each_entry instead of list_for_each. >> > >> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> >> > --- >> > Static analysis stuff. Untested. Please review carefully. >> >> Makes sense to me. >> >> Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> >> > > No doubt, applied. > Thanks, I agree in cases – where we will have chances of parallel access and modification to the linked we should use list_for_each_entry_safe() But my point was related with this code change case in the patch. We will have path like this: f2fs_fill_super->recover_fsync_data->destroy_fsync_dnodes() From this calling path – there can only be a single caller at any given time. So, we will not have the case of having parallel access to the list which is local to recover_fsync_data() and destroyed on exit from this function. From the real issue point of view – this does not looks convincing to me why expensive _safe fucntion should used.
Thanks. > > -- > Jaegeuk Kim > Samsung > -- 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/
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