linux-kernel - RE: [PATCH v37 3/4] scsi: ufs: Prepare HPB read for cached sub-region

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Message-ID: <DM6PR04MB65752E6128BD92A801221ECDFC329@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Sun, 13 Jun 2021 10:20:53 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     "yohan.joung@...com" <yohan.joung@...com>,
        "daejun7.park@...sung.com" <daejun7.park@...sung.com>
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        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "bvanassche@....org" <bvanassche@....org>,
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Subject: RE: [PATCH v37 3/4] scsi: ufs: Prepare HPB read for cached sub-region

> >+      /*
> >+       * If the region state is active, mctx must be allocated.
> >+       * In this case, check whether the region is evicted or
> >+       * mctx allcation fail.
> >+       */
> >+      if (unlikely(!srgn->mctx)) {
> >+              dev_err(&hpb->sdev_ufs_lu->sdev_dev,
> >+                      "no mctx in region %d subregion %d.\n",
> >+                      srgn->rgn_idx, srgn->srgn_idx);
> >+              return true;
> >+      }
> >+
> >+      if ((srgn_offset + cnt) > bitmap_len)
> >+              bit_len = bitmap_len - srgn_offset;
> >+      else
> >+              bit_len = cnt;
> >+
> >+      if (find_next_bit(srgn->mctx->ppn_dirty, bitmap_len,
> >+                        srgn_offset) < bit_len + srgn_offset)
> >+              return true;
> >+
> 
> It seems unnecessary to search through bitmap_len
> How about searching by transfer size?
> 
> if (find_next_bit(srgn->mctx->ppn_dirty,
>               bit_len + srgn_offset, srgn_offset) < bit_len + srgn_offset)
Isn't bit_len should be used for size, and not bit_len + srgn_offset ?

Thanks,
Avri

> 
> Thanks
> Yohan