Update information in the zero-length and one-element arrays section and illustrate how to make use of the new flex_array_size() helper, together with struct_size() and a flexible-array member.
Signed-off-by: Gustavo A. R. Silva <[email protected]> --- Documentation/process/deprecated.rst | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/Documentation/process/deprecated.rst b/Documentation/process/deprecated.rst index 918e32d76fc4..9731704b3f3d 100644 --- a/Documentation/process/deprecated.rst +++ b/Documentation/process/deprecated.rst @@ -322,7 +322,8 @@ to allocate for a structure containing an array of this kind as a member:: In the example above, we had to remember to calculate ``count - 1`` when using the struct_size() helper, otherwise we would have --unintentionally-- allocated memory for one too many ``items`` objects. The cleanest and least error-prone way -to implement this is through the use of a `flexible array member`:: +to implement this is through the use of a `flexible array member`, together with +struct_size() and flex_array_size() helpers:: struct something { size_t count; @@ -334,5 +335,4 @@ to implement this is through the use of a `flexible array member`:: instance = kmalloc(struct_size(instance, items, count), GFP_KERNEL); instance->count = count; - size = sizeof(instance->items[0]) * instance->count; - memcpy(instance->items, source, size); + memcpy(instance->items, source, flex_array_size(instance, items, instance->count)); -- 2.27.0
