x86/cpu: Remove "noclflush"

Not really needed anymore and there's clearcpuid=.

Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220127115626.14179-7-bp@alien8.de

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index a2299b2..8c18e7d 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3444,8 +3444,6 @@
 
        nocache         [ARM]
 
-       noclflush       [BUGS=X86] Don't use the CLFLUSH instruction
-
        delayacct       [KNL] Enable per-task delay accounting
 
        nodsp           [SH] Disable hardware DSP at boot time.

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 5791f69..7dd7604 100644 (file)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1870,14 +1870,6 @@ void identify_secondary_cpu(struct cpuinfo_x86 *c)
        update_srbds_msr();
 }
 
-static __init int setup_noclflush(char *arg)
-{
-       setup_clear_cpu_cap(X86_FEATURE_CLFLUSH);
-       setup_clear_cpu_cap(X86_FEATURE_CLFLUSHOPT);
-       return 1;
-}
-__setup("noclflush", setup_noclflush);
-
 void print_cpu_info(struct cpuinfo_x86 *c)
 {
        const char *vendor = NULL;