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author | Kees Cook <keescook@chromium.org> | 2024-03-01 09:22:26 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-13 14:07:32 +0300 |
commit | 2618ab102c80619211eb3a995ccbc74543d5aa9a (patch) | |
tree | f3019960e4b481b44a3af2fa534fdbd56a6fbfab /include | |
parent | 3ba4aceb68f013f36fbfd0a6aab5df439b4198d4 (diff) | |
download | linux-2618ab102c80619211eb3a995ccbc74543d5aa9a.tar.xz |
overflow: Allow non-type arg to type_max() and type_min()
[ Upstream commit bd1ebf2467f9c5d157bec7b025e83f8ffdae1318 ]
A common use of type_max() is to find the max for the type of a
variable. Using the pattern type_max(typeof(var)) is needlessly
verbose. Instead, since typeof(type) == type we can just explicitly
call typeof() on the argument to type_max() and type_min(). Add
wrappers for readability.
We can do some replacements right away:
$ git grep '\btype_\(min\|max\)(typeof' | wc -l
11
Link: https://lore.kernel.org/r/20240301062221.work.840-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/overflow.h | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/include/linux/overflow.h b/include/linux/overflow.h index f9b60313eaea..e04f67947647 100644 --- a/include/linux/overflow.h +++ b/include/linux/overflow.h @@ -31,8 +31,10 @@ * credit to Christian Biere. */ #define __type_half_max(type) ((type)1 << (8*sizeof(type) - 1 - is_signed_type(type))) -#define type_max(T) ((T)((__type_half_max(T) - 1) + __type_half_max(T))) -#define type_min(T) ((T)((T)-type_max(T)-(T)1)) +#define __type_max(T) ((T)((__type_half_max(T) - 1) + __type_half_max(T))) +#define type_max(t) __type_max(typeof(t)) +#define __type_min(T) ((T)((T)-type_max(T)-(T)1)) +#define type_min(t) __type_min(typeof(t)) /* * Avoids triggering -Wtype-limits compilation warning, @@ -130,10 +132,10 @@ static inline bool __must_check __must_check_overflow(bool overflow) #define __overflows_type_constexpr(x, T) ( \ is_unsigned_type(typeof(x)) ? \ - (x) > type_max(typeof(T)) : \ + (x) > type_max(T) : \ is_unsigned_type(typeof(T)) ? \ - (x) < 0 || (x) > type_max(typeof(T)) : \ - (x) < type_min(typeof(T)) || (x) > type_max(typeof(T))) + (x) < 0 || (x) > type_max(T) : \ + (x) < type_min(T) || (x) > type_max(T)) #define __overflows_type(x, T) ({ \ typeof(T) v = 0; \ |