Vadim Lobanov <[EMAIL PROTECTED]> wrote: > 2. Would it be possible to eliminate the might_sleep() call in > copy_from_user()? It seems that, very soon after, the __copy_from_user() > macro does another might_sleep(), with very few instructions in between. > But there might be some trick here that I'm missing.
might_sleep() is used for debugging the possible sleep while in an atomic operation. I think it is safe to check this for all the calls to copy_from_user(), no matter if the access is OK or not (memset being used in the latter case). The same is for __copy_from_user(). Anyway, if you don't enable CONFIG_DEBUG_SPINLOCK_SLEEP, the might_sleep() macro is empty. -- Catalin - 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/
