x86/spectre: Check CONFIG_RETPOLINE in command line parser
authorDou Liyang <douly.fnst@cn.fujitsu.com>
Tue, 30 Jan 2018 06:13:50 +0000 (14:13 +0800)
committerBen Hutchings <ben@decadent.org.uk>
Mon, 19 Mar 2018 18:58:36 +0000 (18:58 +0000)
commitf5216764b9941ef92dc24ac700ffdb07e429d6f3
tree2c5dd2732d379a2309a6f30cca0ac21938eb790e
parenteb95998118d0cf06c631ae85d912e2b0713b75c4
x86/spectre: Check CONFIG_RETPOLINE in command line parser

commit 9471eee9186a46893726e22ebb54cade3f9bc043 upstream.

The spectre_v2 option 'auto' does not check whether CONFIG_RETPOLINE is
enabled. As a consequence it fails to emit the appropriate warning and sets
feature flags which have no effect at all.

Add the missing IS_ENABLED() check.

Fixes: da285121560e ("x86/spectre: Add boot time option to select Spectre v2 mitigation")
Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: ak@linux.intel.com
Cc: peterz@infradead.org
Cc: Tomohiro" <misono.tomohiro@jp.fujitsu.com>
Cc: dave.hansen@intel.com
Cc: bp@alien8.de
Cc: arjan@linux.intel.com
Cc: dwmw@amazon.co.uk
Link: https://lkml.kernel.org/r/f5892721-7528-3647-08fb-f8d10e65ad87@cn.fujitsu.com
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
arch/x86/kernel/cpu/bugs.c