lkml.org 
[lkml]   [2018]   [Mar]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [PATCH v12 15/22] selftests/vm: powerpc implementation to check support for pkey
    From
    Date
    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?


    \
     
     \ /
      Last update: 2018-03-16 23:27    [W:4.131 / U:0.168 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site