Hi.. On Wed, Mar 16, 2011 at 08:40, va stg2010 <va.storage2010@xxxxxxxxx> wrote: > Hi > Can someone explain to me reason for the comment at line 332-333 of this code > http://lxr.linux.no/#linux+v2.6.27.7/lib/scatterlist.c#L332 > > comment is: > " IRQ must stay disabled till @miter@ is stopped." OK, is this the complete comment you referred? "Context: 332 * IRQ disabled if SG_MITER_ATOMIC. IRQ must stay disabled till 333 * @miter@ is stopped. May sleep if !SG_MITER_ATOMIC." well, then, my raw guess is, because it must be done atomically (when asked to do so). Usually, atomic operation has tight relationship with something that must be done in short time and/or must not be interrupted by interrupt handler. Since this is talking about scatter list, I could only guess few example...perhaps in bio handling? -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
