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[123.220.186.120]) by mx.google.com with ESMTPS id qi2sm7546049pbc.22.2012.11.03.08.44.30 (version=TLSv1/SSLv3 cipher=OTHER); Sat, 03 Nov 2012 08:44:32 -0700 (PDT) From: Akinobu Mita To: linux-kernel@vger.kernel.org, akpm@linux-foundation.org Subject: [PATCH v2 08/11] mtd: mtd_pagetest: convert to use random32_get_bytes_state() Date: Sun, 4 Nov 2012 00:43:39 +0900 Message-Id: <1351957422-23243-9-git-send-email-akinobu.mita@gmail.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1351957422-23243-1-git-send-email-akinobu.mita@gmail.com> References: <1351957422-23243-1-git-send-email-akinobu.mita@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20121103_114433_194849_F56FBFE5 X-CRM114-Status: GOOD ( 15.50 ) 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 [209.85.220.49 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 random32_get_bytes_state(). Signed-off-by: Akinobu Mita Cc: Artem Bityutskiy Cc: David Woodhouse Cc: linux-mtd@lists.infradead.org --- * v2 - rename prandom32_get_bytes to random32_get_bytes_state drivers/mtd/tests/mtd_pagetest.c | 43 ++++++++++++---------------------------- 1 file changed, 13 insertions(+), 30 deletions(-) diff --git a/drivers/mtd/tests/mtd_pagetest.c b/drivers/mtd/tests/mtd_pagetest.c index 252ddb0..d95a16c 100644 --- a/drivers/mtd/tests/mtd_pagetest.c +++ b/drivers/mtd/tests/mtd_pagetest.c @@ -27,6 +27,7 @@ #include #include #include +#include #define PRINT_PREF KERN_INFO "mtd_pagetest: " @@ -45,26 +46,7 @@ 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 int erase_eraseblock(int ebnum) { @@ -98,7 +80,7 @@ static int write_eraseblock(int ebnum) size_t written; loff_t addr = ebnum * mtd->erasesize; - set_random_data(writebuf, mtd->erasesize); + random32_get_bytes_state(&rnd_state, writebuf, mtd->erasesize); cond_resched(); err = mtd_write(mtd, addr, mtd->erasesize, &written, writebuf); if (err || written != mtd->erasesize) @@ -124,7 +106,7 @@ static int verify_eraseblock(int ebnum) for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i) addrn -= mtd->erasesize; - set_random_data(writebuf, mtd->erasesize); + random32_get_bytes_state(&rnd_state, writebuf, mtd->erasesize); for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) { /* Do a read to set the internal dataRAMs to different data */ err = mtd_read(mtd, addr0, bufsize, &read, twopages); @@ -160,7 +142,8 @@ static int verify_eraseblock(int ebnum) } /* Check boundary between eraseblocks */ if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) { - unsigned long oldnext = next; + struct rnd_state old_state = rnd_state; + /* Do a read to set the internal dataRAMs to different data */ err = mtd_read(mtd, addr0, bufsize, &read, twopages); if (mtd_is_bitflip(err)) @@ -188,13 +171,13 @@ static int verify_eraseblock(int ebnum) return err; } memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize); - set_random_data(boundary + pgsize, pgsize); + random32_get_bytes_state(&rnd_state, boundary + pgsize, pgsize); if (memcmp(twopages, boundary, bufsize)) { printk(PRINT_PREF "error: verify failed at %#llx\n", (long long)addr); errcnt += 1; } - next = oldnext; + rnd_state = old_state; } return err; } @@ -326,7 +309,7 @@ static int erasecrosstest(void) return err; printk(PRINT_PREF "writing 1st page of block %d\n", ebnum); - set_random_data(writebuf, pgsize); + random32_get_bytes_state(&rnd_state, writebuf, pgsize); strcpy(writebuf, "There is no data like this!"); err = mtd_write(mtd, addr0, pgsize, &written, writebuf); if (err || written != pgsize) { @@ -359,7 +342,7 @@ static int erasecrosstest(void) return err; printk(PRINT_PREF "writing 1st page of block %d\n", ebnum); - set_random_data(writebuf, pgsize); + random32_get_bytes_state(&rnd_state, writebuf, pgsize); strcpy(writebuf, "There is no data like this!"); err = mtd_write(mtd, addr0, pgsize, &written, writebuf); if (err || written != pgsize) { @@ -417,7 +400,7 @@ static int erasetest(void) return err; printk(PRINT_PREF "writing 1st page of block %d\n", ebnum); - set_random_data(writebuf, pgsize); + random32_get_bytes_state(&rnd_state, writebuf, pgsize); err = mtd_write(mtd, addr0, pgsize, &written, writebuf); if (err || written != pgsize) { printk(PRINT_PREF "error: write failed at %#llx\n", @@ -565,7 +548,7 @@ static int __init mtd_pagetest_init(void) printk(PRINT_PREF "erased %u eraseblocks\n", i); /* Write all eraseblocks */ - simple_srand(1); + srandom32_state(&rnd_state, 1); printk(PRINT_PREF "writing whole device\n"); for (i = 0; i < ebcnt; ++i) { if (bbt[i]) @@ -580,7 +563,7 @@ static int __init mtd_pagetest_init(void) printk(PRINT_PREF "written %u eraseblocks\n", i); /* Check all eraseblocks */ - simple_srand(1); + srandom32_state(&rnd_state, 1); printk(PRINT_PREF "verifying all eraseblocks\n"); for (i = 0; i < ebcnt; ++i) { if (bbt[i])