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 <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Matthew Auld <[email protected]>
Cc: Nirmoy Das <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Andi Shyti <[email protected]>
Cc: Andrzej Hajda <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Kees Cook <[email protected]>
Reviewed-by: Mauro Carvalho Chehab <[email protected]> (v5)
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Reviewed-by: Andrzej Hajda <[email protected]>
Regards
Andrzej
