Re: [PATCH v9 1/8] overflow: Move and add few utility macros into overflow

[Andrzej Hajda]

On 24.08.2022 10:45, Gwan-gyeong Mun wrote:
> It moves overflows_type utility macro into overflow header from i915_utils
> header. The overflows_type can be used to catch the truncaion (overflow)
> between different data types. And it adds check_assign() macro which
> performs an assigning source value into destination ptr along with an
> overflow check. overflow_type macro has been improved to handle the signbit
> by gcc's built-in overflow check function. And it adds overflows_ptr()
> helper macro for checking the overflows between a value and a pointer
> type/value.
>
> v3: Add is_type_unsigned() macro (Mauro)
>      Modify overflows_type() macro to consider signed data types (Mauro)
>      Fix the problem that safe_conversion() macro always returns true
> v4: Fix kernel-doc markups
> v6: Move macro addition location so that it can be used by other than drm
>      subsystem (Jani, Mauro, Andi)
>      Change is_type_unsigned to is_unsigned_type to have the same name form
>      as is_signed_type macro
> v8: Add check_assign() and remove safe_conversion() (Kees)
>      Fix overflows_type() to use gcc's built-in overflow function (Andrzej)
>      Add overflows_ptr() to allow overflow checking when assigning a value
>      into a pointer variable (G.G.)
> v9: Fix overflows_type() to use __builtin_add_overflow() instead of
>      __builtin_add_overflow_p() (Andrzej)
>      Fix overflows_ptr() to use overflows_type() with the unsigned long type
>      (Andrzej)
>
> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@xxxxxxxxx>
> Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
> Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
> Cc: Nirmoy Das <nirmoy.das@xxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Cc: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
> Cc: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
> Cc: Mauro Carvalho Chehab <mauro.chehab@xxxxxxxxxxxxxxx>
> Cc: Kees Cook <keescook@xxxxxxxxxxxx>
> Reviewed-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> (v5)
> ---
Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>

Regards
Andrzej