On Fri, Mar 23, 2018 at 05:27:06PM +0800, Li Wang wrote: > On Thu, Mar 22, 2018 at 3:09 PM, Ram Pai <[1]linuxram@xxxxxxxxxx> wrote: > > On Wed, Mar 21, 2018 at 02:53:00PM +0800, Li Wang wrote: > > On Wed, Mar 21, 2018 at 5:58 AM, Ram Pai > <[1][2]linuxram@xxxxxxxxxx> wrote: > > that why not disable the pkey_execute_disable_supported on p8 .snip.. > machine? > > It turns out to be a testcase bug. On Big endian powerpc ABI, function > ptrs are basically pointers to function descriptors. The testcase > copies functions which results in function descriptors getting copied. > You have to apply the following patch to your test case for it to > operate as intended. Thanks to Michael Ellermen for helping me out. > Otherwise I would be scratching my head for ever. > > Thanks for the explanation, I learned something new about this. :) > > And the worth to say, seems the patch only works on powerpc arch, > others(x86_64, etc) > that does not works well, so a simple workaround is to isolate the code > changes > to powerpc system? yes. this code has to be made applicable to powerpc Big-endian code only. The powerpc little-endian code remains unchanged. RP
