linux-kernel - Re: [RFC PATCH 5/5] scsi: ufs: Prepare HPB read for cached sub-region

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Message-ID: <a20fb89f-5a89-3e15-cd06-e250c60ccbd0@acm.org>
Date:   Mon, 8 Jun 2020 18:23:13 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Avri Altman <Avri.Altman@....com>,
        "daejun7.park@...sung.com" <daejun7.park@...sung.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "tomas.winkler@...el.com" <tomas.winkler@...el.com>
Cc:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sang-yoon Oh <sangyoon.oh@...sung.com>,
        Sung-Jun Park <sungjun07.park@...sung.com>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Jinyoung CHOI <j-young.choi@...sung.com>,
        Adel Choi <adel.choi@...sung.com>,
        BoRam Shin <boram.shin@...sung.com>
Subject: Re: [RFC PATCH 5/5] scsi: ufs: Prepare HPB read for cached sub-region

On 2020-06-06 11:38, Avri Altman wrote:
>> +       for (i = 0; i < bit_len; i++) {
>> +               if (test_bit(srgn_offset + i, srgn->mctx->ppn_dirty))
>
> Maybe use a mask or hweight instead of testing bit by bit?

How about using find_next_bit() from include/linux/bitmap.h?

/*
 *  find_next_bit(addr, nbits, bit) Position next set bit in *addr
 *                                  >= bit
 */

Thanks,

Bart.