From: Borislav Petkov Date: Thu, 27 Jan 2022 11:56:22 +0000 (+0100) Subject: x86/cpu: Remove "nosep" X-Git-Tag: v6.6.17~6984^2~11 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c949110ef4e31cb5d3387bd8273fd5de66b5227b;p=platform%2Fkernel%2Flinux-rpi.git x86/cpu: Remove "nosep" That chicken bit was added by 4f88651125e2 ("[PATCH] i386: allow disabling X86_FEATURE_SEP at boot") but measuring int80 vsyscall performance on 32-bit doesn't matter anymore. If still needed, one can boot with clearcpuid=sep to disable that feature for testing. Signed-off-by: Borislav Petkov Reviewed-by: Kees Cook Link: https://lore.kernel.org/r/20220127115626.14179-3-bp@alien8.de --- diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 0ea1786..a9f3d31 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3665,8 +3665,6 @@ nosbagart [IA-64] - nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. - nosgx [X86-64,SGX] Disables Intel SGX kernel support. nosmp [SMP] Tells an SMP kernel to act as a UP kernel, diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 69c7ea8..c71d107 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -298,13 +298,6 @@ static int __init cachesize_setup(char *str) } __setup("cachesize=", cachesize_setup); -static int __init x86_sep_setup(char *s) -{ - setup_clear_cpu_cap(X86_FEATURE_SEP); - return 1; -} -__setup("nosep", x86_sep_setup); - /* Standard macro to see if a specific flag is changeable */ static inline int flag_is_changeable_p(u32 flag) {