tree 2f3eed17ac2723d5a68aec38683478599c2096b3
parent b3733034f113a4119f734b84e94180a42c8bc1a1
author Ingo Molnar <mingo@elte.hu> 1203746815 +0100
committer Thomas Gleixner <tglx@linutronix.de> 1211811331 +0200

x86: stackprotector & PARAVIRT fix

on paravirt enabled 64-bit kernels the paravirt ops do function
calls themselves - which is bad with the stackprotector - for
example pda_init() loads 0 into %gs and then does MSR_GS_BASE
write (which modifies gs.base) - but that MSR write is a function
call on paravirt, which with stackprotector tries to read the
stack canary from the PDA ... crashing the bootup.

the solution was suggested by Arjan van de Ven: to exclude paravirt.c
from stackprotector, too many lowlevel functionality is in it. It's
not like we'll have paravirt functions with character arrays on
their stack anyway...

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>