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authorRichard Fitzgerald <rf@opensource.cirrus.com>2021-05-25 13:20:11 +0100
committerPetr Mladek <pmladek@suse.com>2021-05-27 15:38:03 +0200
commit1b932689c77766b68e2ead51ca0fb84ec5bb8965 (patch)
tree21122208e0a00f3c39c351bbf8d6b0df2fe6b853 /lib
parentef04d4ff4b19628c78abddc768acce097d35d086 (diff)
downloadlinux-1b932689c77766b68e2ead51ca0fb84ec5bb8965.tar.bz2
lib: test_scanf: Remove pointless use of type_min() with unsigned types
sparse was producing warnings of the form: sparse: cast truncates bits from constant value (ffff0001 becomes 1) There is no actual problem here. Using type_min() on an unsigned type results in an (expected) truncation. However, there is no need to test an unsigned value against type_min(). The minimum value of an unsigned is obviously 0, and any value cast to an unsigned type is >= 0, so for unsigneds only type_max() need be tested. This patch also takes the opportunity to clean up the implementation of simple_numbers_loop() to use a common pattern for the positive and negative test. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20210525122012.6336-2-rf@opensource.cirrus.com
Diffstat (limited to 'lib')
-rw-r--r--lib/test_scanf.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/lib/test_scanf.c b/lib/test_scanf.c
index 8d577aec6c28..48ff5747a4da 100644
--- a/lib/test_scanf.c
+++ b/lib/test_scanf.c
@@ -187,8 +187,8 @@ static const unsigned long long numbers[] __initconst = {
#define value_representable_in_type(T, val) \
(is_signed_type(T) \
? ((long long)(val) >= type_min(T)) && ((long long)(val) <= type_max(T)) \
- : ((unsigned long long)(val) >= type_min(T)) && \
- ((unsigned long long)(val) <= type_max(T)))
+ : ((unsigned long long)(val) <= type_max(T)))
+
#define test_one_number(T, gen_fmt, scan_fmt, val, fn) \
do { \
@@ -204,12 +204,11 @@ do { \
int i; \
\
for (i = 0; i < ARRAY_SIZE(numbers); i++) { \
- if (!value_representable_in_type(T, numbers[i])) \
- continue; \
- \
- test_one_number(T, gen_fmt, scan_fmt, numbers[i], fn); \
+ if (value_representable_in_type(T, numbers[i])) \
+ test_one_number(T, gen_fmt, scan_fmt, \
+ numbers[i], fn); \
\
- if (is_signed_type(T)) \
+ if (value_representable_in_type(T, -numbers[i])) \
test_one_number(T, gen_fmt, scan_fmt, \
-numbers[i], fn); \
} \