One of the more common cases of allocation size calculations is finding the
size of a structure that has a zero-sized array at the end, along with memory
for some number of elements for that array. For example:
struct foo {
int stuff;
void *entry[];
};
instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
Instead of leaving these open-coded and prone to type mistakes, we can now
use the new struct_size() helper:
instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
if (WARN_ON(!cfg || !cfg->eeprom_params))
return NULL;
- data = kzalloc(sizeof(*data) +
- sizeof(struct ieee80211_channel) * IWL_NUM_CHANNELS,
+ data = kzalloc(struct_size(data, channels, IWL_NUM_CHANNELS),
GFP_KERNEL);
if (!data)
return NULL;