tree 4cf6368299b9d521c93a9d2327b7e00e98b80ede
parent 7d5f6a9a2496c6e4f2a3b5db7743ff4e3a99738e
author Max Filippov <jcmvbkbc@gmail.com> 1437032462 +0300
committer Max Filippov <jcmvbkbc@gmail.com> 1439786015 +0300

xtensa: fix kernel register spilling

call12 can't be safely used as the first call in the inline function,
because the compiler does not extend the stack frame of the bounding
function accordingly, which may result in corruption of local variables.

If a call needs to be done, do call8 first followed by call12.

For pure assembly code in _switch_to increase stack frame size of the
bounding function.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>