From patchwork Mon Mar 27 17:51:29 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shaohua Li X-Patchwork-Id: 9647337 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8866260328 for ; Mon, 27 Mar 2017 18:30:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 80A12283FF for ; Mon, 27 Mar 2017 18:30:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7585B28403; Mon, 27 Mar 2017 18:30:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2430428408 for ; 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Mon, 27 Mar 2017 10:51:49 -0700 Received: from mx-out.facebook.com (192.168.52.123) by PRN-CHUB12.TheFacebook.com (192.168.16.22) with Microsoft SMTP Server (TLS) id 14.3.319.2; Mon, 27 Mar 2017 10:51:47 -0700 Received: from facebook.com (2401:db00:21:603d:face:0:19:0) by mx-out.facebook.com (10.223.100.97) with ESMTP id 0bf90f7a131611e7b15624be0593f280-c81e79a0 for ; Mon, 27 Mar 2017 10:51:47 -0700 Received: by devbig638.prn2.facebook.com (Postfix, from userid 11222) id 367AF43A3BAC; Mon, 27 Mar 2017 10:51:46 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Shaohua Li Smtp-Origin-Hostname: devbig638.prn2.facebook.com To: , CC: , , Vivek Goyal , , Smtp-Origin-Cluster: prn2c22 Subject: [PATCH V7 01/18] blk-throttle: use U64_MAX/UINT_MAX to replace -1 Date: Mon, 27 Mar 2017 10:51:29 -0700 Message-ID: <9f7123ea1ba65e09dc1cb488132bff67ddf8d923.1490634565.git.shli@fb.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: References: X-FB-Internal: Safe MIME-Version: 1.0 X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-03-27_16:, , signatures=0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP clean up the code to avoid using -1 Signed-off-by: Shaohua Li --- block/blk-throttle.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 8fab716..0d5d85b 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -334,10 +334,10 @@ static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp, int node) } RB_CLEAR_NODE(&tg->rb_node); - tg->bps[READ] = -1; - tg->bps[WRITE] = -1; - tg->iops[READ] = -1; - tg->iops[WRITE] = -1; + tg->bps[READ] = U64_MAX; + tg->bps[WRITE] = U64_MAX; + tg->iops[READ] = UINT_MAX; + tg->iops[WRITE] = UINT_MAX; return &tg->pd; } @@ -380,7 +380,7 @@ static void tg_update_has_rules(struct throtl_grp *tg) for (rw = READ; rw <= WRITE; rw++) tg->has_rules[rw] = (parent_tg && parent_tg->has_rules[rw]) || - (tg->bps[rw] != -1 || tg->iops[rw] != -1); + (tg->bps[rw] != U64_MAX || tg->iops[rw] != UINT_MAX); } static void throtl_pd_online(struct blkg_policy_data *pd) @@ -771,7 +771,7 @@ static bool tg_may_dispatch(struct throtl_grp *tg, struct bio *bio, bio != throtl_peek_queued(&tg->service_queue.queued[rw])); /* If tg->bps = -1, then BW is unlimited */ - if (tg->bps[rw] == -1 && tg->iops[rw] == -1) { + if (tg->bps[rw] == U64_MAX && tg->iops[rw] == UINT_MAX) { if (wait) *wait = 0; return true; @@ -1112,7 +1112,7 @@ static u64 tg_prfill_conf_u64(struct seq_file *sf, struct blkg_policy_data *pd, struct throtl_grp *tg = pd_to_tg(pd); u64 v = *(u64 *)((void *)tg + off); - if (v == -1) + if (v == U64_MAX) return 0; return __blkg_prfill_u64(sf, pd, v); } @@ -1123,7 +1123,7 @@ static u64 tg_prfill_conf_uint(struct seq_file *sf, struct blkg_policy_data *pd, struct throtl_grp *tg = pd_to_tg(pd); unsigned int v = *(unsigned int *)((void *)tg + off); - if (v == -1) + if (v == UINT_MAX) return 0; return __blkg_prfill_u64(sf, pd, v); } @@ -1197,7 +1197,7 @@ static ssize_t tg_set_conf(struct kernfs_open_file *of, if (sscanf(ctx.body, "%llu", &v) != 1) goto out_finish; if (!v) - v = -1; + v = U64_MAX; tg = blkg_to_tg(ctx.blkg); @@ -1272,17 +1272,17 @@ static u64 tg_prfill_max(struct seq_file *sf, struct blkg_policy_data *pd, if (!dname) return 0; - if (tg->bps[READ] == -1 && tg->bps[WRITE] == -1 && - tg->iops[READ] == -1 && tg->iops[WRITE] == -1) + if (tg->bps[READ] == U64_MAX && tg->bps[WRITE] == U64_MAX && + tg->iops[READ] == UINT_MAX && tg->iops[WRITE] == UINT_MAX) return 0; - if (tg->bps[READ] != -1) + if (tg->bps[READ] != U64_MAX) snprintf(bufs[0], sizeof(bufs[0]), "%llu", tg->bps[READ]); - if (tg->bps[WRITE] != -1) + if (tg->bps[WRITE] != U64_MAX) snprintf(bufs[1], sizeof(bufs[1]), "%llu", tg->bps[WRITE]); - if (tg->iops[READ] != -1) + if (tg->iops[READ] != UINT_MAX) snprintf(bufs[2], sizeof(bufs[2]), "%u", tg->iops[READ]); - if (tg->iops[WRITE] != -1) + if (tg->iops[WRITE] != UINT_MAX) snprintf(bufs[3], sizeof(bufs[3]), "%u", tg->iops[WRITE]); seq_printf(sf, "%s rbps=%s wbps=%s riops=%s wiops=%s\n", @@ -1320,7 +1320,7 @@ static ssize_t tg_set_max(struct kernfs_open_file *of, while (true) { char tok[27]; /* wiops=18446744073709551616 */ char *p; - u64 val = -1; + u64 val = U64_MAX; int len; if (sscanf(ctx.body, "%26s%n", tok, &len) != 1)