[tip: x86/cpu] x86/cpu: Remove "noclflush"

[tip-bot2 for Borislav Petkov]

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID:     f8858b5eff30d1b2be15ef1ea6285964013b95e6
Gitweb:        https://git.kernel.org/tip/f8858b5eff30d1b2be15ef1ea6285964013b95e6
Author:        Borislav Petkov <bp@xxxxxxx>
AuthorDate:    Thu, 27 Jan 2022 12:56:26 +01:00
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Mon, 04 Apr 2022 10:17:05 +02:00

x86/cpu: Remove "noclflush"

Not really needed anymore and there's clearcpuid=.

Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220127115626.14179-7-bp@xxxxxxxxx
---
 Documentation/admin-guide/kernel-parameters.txt | 2 --
 arch/x86/kernel/cpu/common.c                    | 8 --------
 2 files changed, 10 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index a2299b2..8c18e7d 100644
--- 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
--- 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;