[lkml]   [2009]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH block#for-2.6.31 2/3] block: set rq->resid_len to blk_rq_bytes() on issue
    On Sat, 16 May 2009 07:14:44 +0900, Tejun Heo <> wrote:

    > So, I could have written
    > if (cmd->act_len >= rq->resid_len)
    > rq->resid_len = 0;
    > else
    > rq->resid_len -= cmd->act_len
    > Instead I wrote
    > rq->resid_len -= min(cmd->act_len, rq->resid_len);
    > It's just capping the amount to be subtracted so that resid_len
    > doesn't underflow. What is so wrong or bad style about that?

    Curse of the gifted, I guess. To use a subtraction instead of zero
    this way looks like a pointless, even mischievous obfuscation to me.

    Also, we probably want a stack_dump or a printk when actual length
    exceeds the requested length, don't we? If it ever happens, we
    might be overwriting some I/O buffer somewhere.

    -- Pete

     \ /
      Last update: 2009-05-16 01:21    [W:0.019 / U:9.852 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site