[PATCH v4 12/17] Change document for kernel option clearcpuid

From: Fenghua Yu
Date: Fri Mar 01 2019 - 21:52:59 EST

Since kernel option clearcpuid now supports multiple options and CPU
capability flags, the document needs to be changed.

Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Documentation/admin-guide/kernel-parameters.txt | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 858b6c0b9a15..1a195f93d3cc 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -558,10 +558,12 @@
loops can be debugged more effectively on production

- clearcpuid=BITNUM [X86]
+ clearcpuid=BITNUM | FLAG [X86]
Disable CPUID feature X for the kernel. See
arch/x86/include/asm/cpufeatures.h for the valid bit
- numbers. Note the Linux specific bits are not necessarily
+ numbers or /proc/cpuinfo for valid CPU flags.
+ Multiple options can be used to disable a few features.
+ Note the Linux specific bits are not necessarily
stable over kernel options, but the vendor specific
ones should be.
Also note that user programs calling CPUID directly