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mtd: tests: use random32 instead of home-brewed generator

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This is a clean-up patch which removes the own pseudo-random numbers generator
from the speed- and stress-tests and makes them use the 'random32()' generator
instead.

[dwmw2: Merge later fix for negative offsets]

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy 2012-05-18 18:44:53 +03:00 committed by David Woodhouse
parent 3166df0d04
commit bfea1d4ee5
2 changed files with 11 additions and 44 deletions
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16
drivers/mtd/tests/mtd_speedtest.c
View File

@ -26,6 +26,7 @@
#include <linux/mtd/mtd.h> #include <linux/mtd/mtd.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/random.h>
#define PRINT_PREF KERN_INFO "mtd_speedtest: " #define PRINT_PREF KERN_INFO "mtd_speedtest: "
@ -47,25 +48,13 @@ static int ebcnt;
static int pgcnt; static int pgcnt;
static int goodebcnt; static int goodebcnt;
static struct timeval start, finish; static struct timeval start, finish;
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) static void set_random_data(unsigned char *buf, size_t len)
{ {
size_t i; size_t i;
for (i = 0; i < len; ++i) for (i = 0; i < len; ++i)
buf[i] = simple_rand(); buf[i] = random32();
} }
static int erase_eraseblock(int ebnum) static int erase_eraseblock(int ebnum)
@ -407,7 +396,6 @@ static int __init mtd_speedtest_init(void)
goto out; goto out;
} }
simple_srand(1);
set_random_data(iobuf, mtd->erasesize); set_random_data(iobuf, mtd->erasesize);
err = scan_for_bad_eraseblocks(); err = scan_for_bad_eraseblocks();

39
drivers/mtd/tests/mtd_stresstest.c
View File

@ -27,6 +27,7 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/vmalloc.h> #include <linux/vmalloc.h>
#include <linux/random.h>
#define PRINT_PREF KERN_INFO "mtd_stresstest: " #define PRINT_PREF KERN_INFO "mtd_stresstest: "
@ -48,28 +49,13 @@ static int pgsize;
static int bufsize; static int bufsize;
static int ebcnt; static int ebcnt;
static int pgcnt; static int pgcnt;
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 int rand_eb(void) static int rand_eb(void)
{ {
int eb; unsigned int eb;
again: again:
if (ebcnt < 32768) eb = random32();
eb = simple_rand();
else
eb = (simple_rand() << 15) | simple_rand();
/* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */ /* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
eb %= (ebcnt - 1); eb %= (ebcnt - 1);
if (bbt[eb]) if (bbt[eb])
@ -79,24 +65,18 @@ again:
static int rand_offs(void) static int rand_offs(void)
{ {
int offs; unsigned int offs;
if (bufsize < 32768) offs = random32();
offs = simple_rand();
else
offs = (simple_rand() << 15) | simple_rand();
offs %= bufsize; offs %= bufsize;
return offs; return offs;
} }
static int rand_len(int offs) static int rand_len(int offs)
{ {
int len; unsigned int len;
if (bufsize < 32768) len = random32();
len = simple_rand();
else
len = (simple_rand() << 15) | simple_rand();
len %= (bufsize - offs); len %= (bufsize - offs);
return len; return len;
} }
@ -211,7 +191,7 @@ static int do_write(void)
static int do_operation(void) static int do_operation(void)
{ {
if (simple_rand() & 1) if (random32() & 1)
return do_read(); return do_read();
else else
return do_write(); return do_write();
@ -302,9 +282,8 @@ static int __init mtd_stresstest_init(void)
} }
for (i = 0; i < ebcnt; i++) for (i = 0; i < ebcnt; i++)
offsets[i] = mtd->erasesize; offsets[i] = mtd->erasesize;
simple_srand(current->pid);
for (i = 0; i < bufsize; i++) for (i = 0; i < bufsize; i++)
writebuf[i] = simple_rand(); writebuf[i] = random32();
err = scan_for_bad_eraseblocks(); err = scan_for_bad_eraseblocks();
if (err) if (err)