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SubjectRe: [PATCH v12 15/22] selftests/vm: powerpc implementation to check support for pkey
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On 02/21/2018 05:55 PM, Ram Pai wrote:
> #define PAGE_SIZE (0x1UL << 16)
> -static inline int cpu_has_pku(void)
> +static inline bool is_pkey_supported(void)
> {
> - return 1;
> + /*
> + * No simple way to determine this.
> + * lets try allocating a key and see if it succeeds.
> + */
> + int ret = sys_pkey_alloc(0, 0);
> +
> + if (ret > 0) {
> + sys_pkey_free(ret);
> + return true;
> + }
> + return false;
> }

The point of doing this was to have a test for the CPU that way separate
from the syscalls.

Can you leave cpu_has_pkeys() in place?


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