Re: [PATCH v12 15/22] selftests/vm: powerpc implementation to check support for pkey

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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