On Tue, Jan 2, 2018 at 5:03 AM, Joey Pabalinas <joeypabalinas@xxxxxxxxx> wrote:
> The characters pointed to by `zswap_compressor`, `type`, and `compressor`
> aren't ever modified. Add const to the static variable and both parameters in
> `zswap_pool_find_get()`, `zswap_pool_create()`, and `__zswap_param_set()`
>
> Signed-off-by: Joey Pabalinas <joeypabalinas@xxxxxxxxx>
Nak.
Those variables are not const; they are updated in
__zswap_param_set(). They aren't modified in pool_find_get() or
pool_create(), but they certainly aren't globally const.
>
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/mm/zswap.c b/mm/zswap.c
> index d39581a076c3aed1e9..a4f2dfaf9131694265 100644
> --- a/mm/zswap.c
> +++ b/mm/zswap.c
> @@ -90,7 +90,7 @@ module_param_cb(enabled, &zswap_enabled_param_ops, &zswap_enabled, 0644);
>
> /* Crypto compressor to use */
> #define ZSWAP_COMPRESSOR_DEFAULT "lzo"
> -static char *zswap_compressor = ZSWAP_COMPRESSOR_DEFAULT;
> +static const char *zswap_compressor = ZSWAP_COMPRESSOR_DEFAULT;
> static int zswap_compressor_param_set(const char *,
> const struct kernel_param *);
> static struct kernel_param_ops zswap_compressor_param_ops = {
> @@ -475,7 +475,8 @@ static struct zswap_pool *zswap_pool_last_get(void)
> }
>
> /* type and compressor must be null-terminated */
> -static struct zswap_pool *zswap_pool_find_get(char *type, char *compressor)
> +static struct zswap_pool *zswap_pool_find_get(const char *type,
> + const char *compressor)
> {
> struct zswap_pool *pool;
>
> @@ -495,7 +496,8 @@ static struct zswap_pool *zswap_pool_find_get(char *type, char *compressor)
> return NULL;
> }
>
> -static struct zswap_pool *zswap_pool_create(char *type, char *compressor)
> +static struct zswap_pool *zswap_pool_create(const char *type,
> + const char *compressor)
> {
> struct zswap_pool *pool;
> char name[38]; /* 'zswap' + 32 char (max) num + \0 */
> @@ -658,7 +660,7 @@ static void zswap_pool_put(struct zswap_pool *pool)
>
> /* val must be a null-terminated string */
> static int __zswap_param_set(const char *val, const struct kernel_param *kp,
> - char *type, char *compressor)
> + const char *type, const char *compressor)
> {
> struct zswap_pool *pool, *put_pool = NULL;
> char *s = strstrip((char *)val);
> --
> 2.15.1
>
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