Messages in this thread Patch in this message | | | Date | Mon, 7 Jan 2019 11:33:43 -0600 | From | "Gustavo A. R. Silva" <> | Subject | [PATCH] cpufreq: e_powersaver: Use struct_size() in kzalloc() |
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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> --- drivers/cpufreq/e_powersaver.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/cpufreq/e_powersaver.c b/drivers/cpufreq/e_powersaver.c index 60bea302abbe..2d3ef208dd70 100644 --- a/drivers/cpufreq/e_powersaver.c +++ b/drivers/cpufreq/e_powersaver.c @@ -323,9 +323,8 @@ static int eps_cpu_init(struct cpufreq_policy *policy) states = 2; /* Allocate private data and frequency table for current cpu */ - centaur = kzalloc(sizeof(*centaur) - + (states + 1) * sizeof(struct cpufreq_frequency_table), - GFP_KERNEL); + centaur = kzalloc(struct_size(centaur, freq_table, states + 1), + GFP_KERNEL); if (!centaur) return -ENOMEM; eps_cpu[0] = centaur; -- 2.20.1
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