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Date: Fri, 29 Nov 2019 17:12:18 -0500
From: George Spelvin <lkml@....org>
To: linux-kernel@...r.kernel.org, lkml@....org
Cc: Ferdinand Blomqvist <ferdinand.blomqvist@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: [RFC PATCH v1 32/50] lib/test*.c: Use prandom_u32_max()
lib/reed_solomon/test_rslib.c alreasy uses prandom_u32();
lib/test_hexdump.c and lib/test-string_helpers.c were using
get_random_int() % range, which is needlessly expensive for
test code.
Signed-off-by: George Spelvin <lkml@....org>
Cc: Ferdinand Blomqvist <ferdinand.blomqvist@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
---
lib/reed_solomon/test_rslib.c | 4 ++--
lib/test-string_helpers.c | 2 +-
lib/test_hexdump.c | 10 +++++-----
3 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/lib/reed_solomon/test_rslib.c b/lib/reed_solomon/test_rslib.c
index 4eb29f365ece0..58e767c142ef8 100644
--- a/lib/reed_solomon/test_rslib.c
+++ b/lib/reed_solomon/test_rslib.c
@@ -183,7 +183,7 @@ static int get_rcw_we(struct rs_control *rs, struct wspace *ws,
do {
/* Must not choose the same location twice */
- errloc = prandom_u32() % len;
+ errloc = prandom_u32_max(len);
} while (errlocs[errloc] != 0);
errlocs[errloc] = 1;
@@ -194,7 +194,7 @@ static int get_rcw_we(struct rs_control *rs, struct wspace *ws,
for (i = 0; i < eras; i++) {
do {
/* Must not choose the same location twice */
- errloc = prandom_u32() % len;
+ errloc = prandom_u32_max(len);
} while (errlocs[errloc] != 0);
derrlocs[i] = errloc;
diff --git a/lib/test-string_helpers.c b/lib/test-string_helpers.c
index 25b5cbfb7615b..3349f3ddc528c 100644
--- a/lib/test-string_helpers.c
+++ b/lib/test-string_helpers.c
@@ -398,7 +398,7 @@ static int __init test_string_helpers_init(void)
for (i = 0; i < UNESCAPE_ANY + 1; i++)
test_string_unescape("unescape", i, false);
test_string_unescape("unescape inplace",
- get_random_int() % (UNESCAPE_ANY + 1), true);
+ prandom_u32_max(UNESCAPE_ANY + 1), true);
/* Without dictionary */
for (i = 0; i < (ESCAPE_ANY_NP | ESCAPE_HEX) + 1; i++)
diff --git a/lib/test_hexdump.c b/lib/test_hexdump.c
index 5144899d3c6b8..54e4efb28b974 100644
--- a/lib/test_hexdump.c
+++ b/lib/test_hexdump.c
@@ -149,7 +149,7 @@ static void __init test_hexdump(size_t len, int rowsize, int groupsize,
static void __init test_hexdump_set(int rowsize, bool ascii)
{
size_t d = min_t(size_t, sizeof(data_b), rowsize);
- size_t len = get_random_int() % d + 1;
+ size_t len = prandom_u32_max(d) + 1;
test_hexdump(len, rowsize, 4, ascii);
test_hexdump(len, rowsize, 2, ascii);
@@ -208,11 +208,11 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
{
unsigned int i = 0;
- int rs = (get_random_int() % 2 + 1) * 16;
+ int rs = (prandom_u32() % 2 + 1) * 16;
do {
int gs = 1 << i;
- size_t len = get_random_int() % rs + gs;
+ size_t len = prandom_u32_max(rs) + gs;
test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, ascii);
} while (i++ < 3);
@@ -223,11 +223,11 @@ static int __init test_hexdump_init(void)
unsigned int i;
int rowsize;
- rowsize = (get_random_int() % 2 + 1) * 16;
+ rowsize = (prandom_u32() % 2 + 1) * 16;
for (i = 0; i < 16; i++)
test_hexdump_set(rowsize, false);
- rowsize = (get_random_int() % 2 + 1) * 16;
+ rowsize = (prandom_u32() % 2 + 1) * 16;
for (i = 0; i < 16; i++)
test_hexdump_set(rowsize, true);
--
2.26.0
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