From patchwork Sun Oct 28 07:19:06 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Akinobu Mita X-Patchwork-Id: 194650 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:4978:20e::2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id DA2652C008B for ; Sun, 28 Oct 2012 18:21:18 +1100 (EST) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TSNAU-0001Qk-DF; Sun, 28 Oct 2012 07:20:22 +0000 Received: from mail-pb0-f49.google.com ([209.85.160.49]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TSNA0-0001Km-3B for linux-mtd@lists.infradead.org; Sun, 28 Oct 2012 07:19:53 +0000 Received: by mail-pb0-f49.google.com with SMTP id xa7so3292853pbc.36 for ; Sun, 28 Oct 2012 00:19:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; bh=3gVC+oQ7UbJ1JMHyrHpe6gDHBtMaE85vyNl7inkyWxI=; b=YPYe1iXFwBlfDIS1oToa1StXBP5BQFG+M29P1DZfdZ0XS7+qRWKQ0Jwo0pgPqyyTFo FQwf3wImjHz+xcPyFiGMhcAjE2XbRaJbDuPETmF8uMM1FtxNaVhUCY1/PWocCp/7cWjh DRBJYifBW8oSh0NqCDFipnYTceYAkdYnQX3OoM1gg+w+jOM/d59FDEK3Jb/Qx7HJc8Pz 0sp1i/+rKU6dmlNaLyoGbiAAghIsNM4o+BwsbquSgsL1hwA0s7ZUNL+mppxBqnKbnWSh PAiojkgtBjOpMycmQ6jY5PJJij55Pf6faWLdHYCY6SC0Hf1vvs8U2/EMNUKES5BTfzeC 39cQ== Received: by 10.68.135.234 with SMTP id pv10mr82714243pbb.156.1351408790309; Sun, 28 Oct 2012 00:19:50 -0700 (PDT) Received: from localhost.localdomain (p1120-ipbf2201hodogaya.kanagawa.ocn.ne.jp. [123.220.186.120]) by mx.google.com with ESMTPS id lb4sm3961166pbc.6.2012.10.28.00.19.48 (version=TLSv1/SSLv3 cipher=OTHER); Sun, 28 Oct 2012 00:19:49 -0700 (PDT) From: Akinobu Mita To: linux-kernel@vger.kernel.org, akpm@linux-foundation.org Subject: [PATCH 9/9] mtd: mtd_subpagetest: convert to use prandom32_get_bytes() Date: Sun, 28 Oct 2012 16:19:06 +0900 Message-Id: <1351408746-8623-9-git-send-email-akinobu.mita@gmail.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1351408746-8623-1-git-send-email-akinobu.mita@gmail.com> References: <1351408746-8623-1-git-send-email-akinobu.mita@gmail.com> X-Spam-Note: CRM114 invocation failed X-Spam-Score: -2.7 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.160.49 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (akinobu.mita[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature Cc: linux-mtd@lists.infradead.org, David Woodhouse , Akinobu Mita , Artem Bityutskiy X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-mtd-bounces@lists.infradead.org Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org This removes home-brewed pseudo-random number generator and use prandom32_get_bytes(). Signed-off-by: Akinobu Mita Cc: Artem Bityutskiy Cc: David Woodhouse Cc: linux-mtd@lists.infradead.org --- drivers/mtd/tests/mtd_subpagetest.c | 42 +++++++++++-------------------------- 1 file changed, 12 insertions(+), 30 deletions(-) diff --git a/drivers/mtd/tests/mtd_subpagetest.c b/drivers/mtd/tests/mtd_subpagetest.c index 9667bf5..86a7140 100644 --- a/drivers/mtd/tests/mtd_subpagetest.c +++ b/drivers/mtd/tests/mtd_subpagetest.c @@ -26,6 +26,7 @@ #include #include #include +#include #define PRINT_PREF KERN_INFO "mtd_subpagetest: " @@ -43,26 +44,7 @@ static int bufsize; static int ebcnt; static int pgcnt; static int errcnt; -static unsigned long next = 1; - -static inline unsigned int simple_rand(void) -{ - next = next * 1103515245 + 12345; - return (unsigned int)((next / 65536) % 32768); -} - -static inline void simple_srand(unsigned long seed) -{ - next = seed; -} - -static void set_random_data(unsigned char *buf, size_t len) -{ - size_t i; - - for (i = 0; i < len; ++i) - buf[i] = simple_rand(); -} +static struct rnd_state rnd_state; static inline void clear_data(unsigned char *buf, size_t len) { @@ -119,7 +101,7 @@ static int write_eraseblock(int ebnum) int err = 0; loff_t addr = ebnum * mtd->erasesize; - set_random_data(writebuf, subpgsize); + prandom32_get_bytes(&rnd_state, writebuf, subpgsize); err = mtd_write(mtd, addr, subpgsize, &written, writebuf); if (unlikely(err || written != subpgsize)) { printk(PRINT_PREF "error: write failed at %#llx\n", @@ -133,7 +115,7 @@ static int write_eraseblock(int ebnum) addr += subpgsize; - set_random_data(writebuf, subpgsize); + prandom32_get_bytes(&rnd_state, writebuf, subpgsize); err = mtd_write(mtd, addr, subpgsize, &written, writebuf); if (unlikely(err || written != subpgsize)) { printk(PRINT_PREF "error: write failed at %#llx\n", @@ -157,7 +139,7 @@ static int write_eraseblock2(int ebnum) for (k = 1; k < 33; ++k) { if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize) break; - set_random_data(writebuf, subpgsize * k); + prandom32_get_bytes(&rnd_state, writebuf, subpgsize * k); err = mtd_write(mtd, addr, subpgsize * k, &written, writebuf); if (unlikely(err || written != subpgsize * k)) { printk(PRINT_PREF "error: write failed at %#llx\n", @@ -193,7 +175,7 @@ static int verify_eraseblock(int ebnum) int err = 0; loff_t addr = ebnum * mtd->erasesize; - set_random_data(writebuf, subpgsize); + prandom32_get_bytes(&rnd_state, writebuf, subpgsize); clear_data(readbuf, subpgsize); err = mtd_read(mtd, addr, subpgsize, &read, readbuf); if (unlikely(err || read != subpgsize)) { @@ -220,7 +202,7 @@ static int verify_eraseblock(int ebnum) addr += subpgsize; - set_random_data(writebuf, subpgsize); + prandom32_get_bytes(&rnd_state, writebuf, subpgsize); clear_data(readbuf, subpgsize); err = mtd_read(mtd, addr, subpgsize, &read, readbuf); if (unlikely(err || read != subpgsize)) { @@ -257,7 +239,7 @@ static int verify_eraseblock2(int ebnum) for (k = 1; k < 33; ++k) { if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize) break; - set_random_data(writebuf, subpgsize * k); + prandom32_get_bytes(&rnd_state, writebuf, subpgsize * k); clear_data(readbuf, subpgsize * k); err = mtd_read(mtd, addr, subpgsize * k, &read, readbuf); if (unlikely(err || read != subpgsize * k)) { @@ -430,7 +412,7 @@ static int __init mtd_subpagetest_init(void) goto out; printk(PRINT_PREF "writing whole device\n"); - simple_srand(1); + prandom32_seed(&rnd_state, 1); for (i = 0; i < ebcnt; ++i) { if (bbt[i]) continue; @@ -443,7 +425,7 @@ static int __init mtd_subpagetest_init(void) } printk(PRINT_PREF "written %u eraseblocks\n", i); - simple_srand(1); + prandom32_seed(&rnd_state, 1); printk(PRINT_PREF "verifying all eraseblocks\n"); for (i = 0; i < ebcnt; ++i) { if (bbt[i]) @@ -466,7 +448,7 @@ static int __init mtd_subpagetest_init(void) goto out; /* Write all eraseblocks */ - simple_srand(3); + prandom32_seed(&rnd_state, 3); printk(PRINT_PREF "writing whole device\n"); for (i = 0; i < ebcnt; ++i) { if (bbt[i]) @@ -481,7 +463,7 @@ static int __init mtd_subpagetest_init(void) printk(PRINT_PREF "written %u eraseblocks\n", i); /* Check all eraseblocks */ - simple_srand(3); + prandom32_seed(&rnd_state, 3); printk(PRINT_PREF "verifying all eraseblocks\n"); for (i = 0; i < ebcnt; ++i) { if (bbt[i])