[PATCH v8 3/9] landlock: Optimize the number of calls to get_access_mask slightly

[Mickaël Salaün]

I'll send these first three patches for the next merge window (next
week). You can remove them in the next series.

Thanks!

On Fri, Dec 08, 2023 at 04:51:15PM +0100, Günther Noack wrote:
> This call is now going through a function pointer,
> and it is not as obvious any more that it will be inlined.
> 
> Signed-off-by: Günther Noack <gnoack at google.com>
> ---
>  security/landlock/ruleset.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/security/landlock/ruleset.c b/security/landlock/ruleset.c
> index 789c81b26a50..e0a5fbf9201a 100644
> --- a/security/landlock/ruleset.c
> +++ b/security/landlock/ruleset.c
> @@ -723,11 +723,12 @@ landlock_init_layer_masks(const struct landlock_ruleset *const domain,
>  	/* Saves all handled accesses per layer. */
>  	for (layer_level = 0; layer_level < domain->num_layers; layer_level++) {
>  		const unsigned long access_req = access_request;
> +		const access_mask_t access_mask =
> +			get_access_mask(domain, layer_level);
>  		unsigned long access_bit;
>  
>  		for_each_set_bit(access_bit, &access_req, num_access) {
> -			if (BIT_ULL(access_bit) &
> -			    get_access_mask(domain, layer_level)) {
> +			if (BIT_ULL(access_bit) & access_mask) {
>  				(*layer_masks)[access_bit] |=
>  					BIT_ULL(layer_level);
>  				handled_accesses |= BIT_ULL(access_bit);
> -- 
> 2.43.0.472.g3155946c3a-goog
> 
>