* [PATCH 0/2] Reworking configurability of X86_FEATURE_NAMES @ 2023-05-10 6:57 Lukas Bulwahn 2023-05-10 6:57 ` [PATCH 1/2] x86: make X86_FEATURE_NAMES non-configurable in prompt Lukas Bulwahn 2023-05-10 6:57 ` [PATCH 2/2] x86: always build with X86_FEATURE_NAMES functionality Lukas Bulwahn 0 siblings, 2 replies; 4+ messages in thread From: Lukas Bulwahn @ 2023-05-10 6:57 UTC (permalink / raw) To: Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, x86, H . Peter Anvin Cc: Masahiro Yamada, Arnd Bergmann, kernel-janitors, linux-kernel, Lukas Bulwahn Dear Dave, dear Boris, dear x86 maintainers, as follow-up to the discussion on my initial patch on changing the visibility of X86_FEATURE_NAMES (see Link), here are two patches: Patch 1 simply makes the minimal one-line change to make X86_FEATURE_NAMES disappear from the prompt. Patch 2 is the more radical change to remove the whole config and see which code would generally be impacted; just as quick exploration. The diffstat shows we are getting rid of a bit of code throughout arch/x86, but the change and reduction is not too complex either: arch/x86/Kconfig | 12 ------------ arch/x86/Kconfig.cpu | 2 +- arch/x86/boot/Makefile | 2 -- arch/x86/boot/cpu.c | 13 ------------- arch/x86/include/asm/cpufeature.h | 5 ----- arch/x86/kernel/cpu/Makefile | 4 +--- arch/x86/kernel/cpu/common.c | 4 ---- 7 files changed, 2 insertions(+), 40 deletions(-) Probably, you just want to pick patch 1 and wait for any complaints. Or if you are confident the compliants will not show up, simply apply both. Otherwise, I will put it on my list to come back in a year or two, and if there were no complaints till then, provide the updated patch to remove the X86_FEATURE_NAMES config then. Link: https://lore.kernel.org/all/20230509084007.24373-1-lukas.bulwahn@gmail.com/ Best regards, Lukas Lukas Bulwahn (2): x86: make X86_FEATURE_NAMES non-configurable in prompt x86: always build with X86_FEATURE_NAMES functionality arch/x86/Kconfig | 12 ------------ arch/x86/Kconfig.cpu | 2 +- arch/x86/boot/Makefile | 2 -- arch/x86/boot/cpu.c | 13 ------------- arch/x86/include/asm/cpufeature.h | 5 ----- arch/x86/kernel/cpu/Makefile | 4 +--- arch/x86/kernel/cpu/common.c | 4 ---- 7 files changed, 2 insertions(+), 40 deletions(-) -- 2.17.1 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 1/2] x86: make X86_FEATURE_NAMES non-configurable in prompt 2023-05-10 6:57 [PATCH 0/2] Reworking configurability of X86_FEATURE_NAMES Lukas Bulwahn @ 2023-05-10 6:57 ` Lukas Bulwahn 2023-05-10 6:57 ` [PATCH 2/2] x86: always build with X86_FEATURE_NAMES functionality Lukas Bulwahn 1 sibling, 0 replies; 4+ messages in thread From: Lukas Bulwahn @ 2023-05-10 6:57 UTC (permalink / raw) To: Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, x86, H . Peter Anvin Cc: Masahiro Yamada, Arnd Bergmann, kernel-janitors, linux-kernel, Lukas Bulwahn While discussing to change the visibility of X86_FEATURE_NAMES (see Link) in order to remove CONFIG_EMBEDDED, Boris suggested to simply make the X86_FEATURE_NAMES functionality unconditional. As a first step, make X86_FEATURE_NAMES disappear in the config prompt. So, as X86_FEATURE_NAMES defaults to yes, to disable it, one now needs to modify the .config file before compiling the kernel. If there are no complaints on this config after a grace period, we can then further remove the config entirely. Link: https://lore.kernel.org/all/20230509084007.24373-1-lukas.bulwahn@gmail.com/ Suggested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com> --- arch/x86/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 53bab123a8ee..a7db116e429a 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -442,7 +442,7 @@ config SMP If you don't know what to do here, say N. config X86_FEATURE_NAMES - bool "Processor feature human-readable names" if EMBEDDED + bool default y help This option compiles in a table of x86 feature bits and corresponding -- 2.17.1 ^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 2/2] x86: always build with X86_FEATURE_NAMES functionality 2023-05-10 6:57 [PATCH 0/2] Reworking configurability of X86_FEATURE_NAMES Lukas Bulwahn 2023-05-10 6:57 ` [PATCH 1/2] x86: make X86_FEATURE_NAMES non-configurable in prompt Lukas Bulwahn @ 2023-05-10 6:57 ` Lukas Bulwahn 2023-05-15 21:43 ` [tip: x86/cpu] x86/cpu: Remove X86_FEATURE_NAMES tip-bot2 for Lukas Bulwahn 1 sibling, 1 reply; 4+ messages in thread From: Lukas Bulwahn @ 2023-05-10 6:57 UTC (permalink / raw) To: Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, x86, H . Peter Anvin Cc: Masahiro Yamada, Arnd Bergmann, kernel-janitors, linux-kernel, Lukas Bulwahn While discussing to change the visibility of X86_FEATURE_NAMES (see Link) in order to remove CONFIG_EMBEDDED, Boris suggested to simply make the X86_FEATURE_NAMES functionality unconditional. As the need for really tiny kernel images has gone away and kernel images with !X86_FEATURE_NAMES is hardly tested, remove this config and the whole ifdeffery in the source code. Link: https://lore.kernel.org/all/20230509084007.24373-1-lukas.bulwahn@gmail.com/ Suggested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com> --- arch/x86/Kconfig | 12 ------------ arch/x86/Kconfig.cpu | 2 +- arch/x86/boot/Makefile | 2 -- arch/x86/boot/cpu.c | 13 ------------- arch/x86/include/asm/cpufeature.h | 5 ----- arch/x86/kernel/cpu/Makefile | 4 +--- arch/x86/kernel/cpu/common.c | 4 ---- 7 files changed, 2 insertions(+), 40 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index a7db116e429a..f6aa7e0ca47d 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -291,7 +291,6 @@ config X86 select TRACE_IRQFLAGS_NMI_SUPPORT select USER_STACKTRACE_SUPPORT select HAVE_ARCH_KCSAN if X86_64 - select X86_FEATURE_NAMES if PROC_FS select PROC_PID_ARCH_STATUS if PROC_FS select HAVE_ARCH_NODE_DEV_GROUP if X86_SGX select FUNCTION_ALIGNMENT_16B if X86_64 || X86_ALIGNMENT_16 @@ -441,17 +440,6 @@ config SMP If you don't know what to do here, say N. -config X86_FEATURE_NAMES - bool - default y - help - This option compiles in a table of x86 feature bits and corresponding - names. This is required to support /proc/cpuinfo and a few kernel - messages. You can disable this to save space, at the expense of - making those few kernel messages show numeric feature bits instead. - - If in doubt, say Y. - config X86_X2APIC bool "Support x2apic" depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST) diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu index 542377cd419d..00468adf180f 100644 --- a/arch/x86/Kconfig.cpu +++ b/arch/x86/Kconfig.cpu @@ -389,7 +389,7 @@ config IA32_FEAT_CTL config X86_VMX_FEATURE_NAMES def_bool y - depends on IA32_FEAT_CTL && X86_FEATURE_NAMES + depends on IA32_FEAT_CTL menuconfig PROCESSOR_SELECT bool "Supported processor vendors" if EXPERT diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile index 9e38ffaadb5d..f33e45ed1437 100644 --- a/arch/x86/boot/Makefile +++ b/arch/x86/boot/Makefile @@ -55,14 +55,12 @@ HOST_EXTRACFLAGS += -I$(srctree)/tools/include \ -include include/generated/autoconf.h \ -D__EXPORTED_HEADERS__ -ifdef CONFIG_X86_FEATURE_NAMES $(obj)/cpu.o: $(obj)/cpustr.h quiet_cmd_cpustr = CPUSTR $@ cmd_cpustr = $(obj)/mkcpustr > $@ $(obj)/cpustr.h: $(obj)/mkcpustr FORCE $(call if_changed,cpustr) -endif targets += cpustr.h # --------------------------------------------------------------------------- diff --git a/arch/x86/boot/cpu.c b/arch/x86/boot/cpu.c index 0bbf4f3707d2..feb6dbd7ca86 100644 --- a/arch/x86/boot/cpu.c +++ b/arch/x86/boot/cpu.c @@ -14,9 +14,7 @@ */ #include "boot.h" -#ifdef CONFIG_X86_FEATURE_NAMES #include "cpustr.h" -#endif static char *cpu_name(int level) { @@ -35,7 +33,6 @@ static char *cpu_name(int level) static void show_cap_strs(u32 *err_flags) { int i, j; -#ifdef CONFIG_X86_FEATURE_NAMES const unsigned char *msg_strs = (const unsigned char *)x86_cap_strs; for (i = 0; i < NCAPINTS; i++) { u32 e = err_flags[i]; @@ -58,16 +55,6 @@ static void show_cap_strs(u32 *err_flags) e >>= 1; } } -#else - for (i = 0; i < NCAPINTS; i++) { - u32 e = err_flags[i]; - for (j = 0; j < 32; j++) { - if (e & 1) - printf("%d:%d ", i, j); - e >>= 1; - } - } -#endif } int validate_cpu(void) diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h index ce0c8f7d3218..a26bebbdff87 100644 --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -38,15 +38,10 @@ enum cpuid_leafs #define X86_CAP_FMT_NUM "%d:%d" #define x86_cap_flag_num(flag) ((flag) >> 5), ((flag) & 31) -#ifdef CONFIG_X86_FEATURE_NAMES extern const char * const x86_cap_flags[NCAPINTS*32]; extern const char * const x86_power_flags[32]; #define X86_CAP_FMT "%s" #define x86_cap_flag(flag) x86_cap_flags[flag] -#else -#define X86_CAP_FMT X86_CAP_FMT_NUM -#define x86_cap_flag x86_cap_flag_num -#endif /* * In order to save room, we index into this array by doing diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile index d7e3ceaf75c1..4350f6bfc064 100644 --- a/arch/x86/kernel/cpu/Makefile +++ b/arch/x86/kernel/cpu/Makefile @@ -27,7 +27,7 @@ obj-y += cpuid-deps.o obj-y += umwait.o obj-$(CONFIG_PROC_FS) += proc.o -obj-$(CONFIG_X86_FEATURE_NAMES) += capflags.o powerflags.o +obj-y += capflags.o powerflags.o obj-$(CONFIG_IA32_FEAT_CTL) += feat_ctl.o ifdef CONFIG_CPU_SUP_INTEL @@ -54,7 +54,6 @@ obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o obj-$(CONFIG_HYPERVISOR_GUEST) += vmware.o hypervisor.o mshyperv.o obj-$(CONFIG_ACRN_GUEST) += acrn.o -ifdef CONFIG_X86_FEATURE_NAMES quiet_cmd_mkcapflags = MKCAP $@ cmd_mkcapflags = $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $@ $^ @@ -63,5 +62,4 @@ vmxfeature = $(src)/../../include/asm/vmxfeatures.h $(obj)/capflags.c: $(cpufeature) $(vmxfeature) $(src)/mkcapflags.sh FORCE $(call if_changed,mkcapflags) -endif targets += capflags.c diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 80710a68ef7d..849ed7e2a726 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1502,12 +1502,10 @@ static void __init cpu_parse_early_param(void) if (!kstrtouint(opt, 10, &bit)) { if (bit < NCAPINTS * 32) { -#ifdef CONFIG_X86_FEATURE_NAMES /* empty-string, i.e., ""-defined feature flags */ if (!x86_cap_flags[bit]) pr_cont(" " X86_CAP_FMT_NUM, x86_cap_flag_num(bit)); else -#endif pr_cont(" " X86_CAP_FMT, x86_cap_flag(bit)); setup_clear_cpu_cap(bit); @@ -1520,7 +1518,6 @@ static void __init cpu_parse_early_param(void) continue; } -#ifdef CONFIG_X86_FEATURE_NAMES for (bit = 0; bit < 32 * NCAPINTS; bit++) { if (!x86_cap_flag(bit)) continue; @@ -1537,7 +1534,6 @@ static void __init cpu_parse_early_param(void) if (!found) pr_cont(" (unknown: %s)", opt); -#endif } pr_cont("\n"); -- 2.17.1 ^ permalink raw reply related [flat|nested] 4+ messages in thread
* [tip: x86/cpu] x86/cpu: Remove X86_FEATURE_NAMES 2023-05-10 6:57 ` [PATCH 2/2] x86: always build with X86_FEATURE_NAMES functionality Lukas Bulwahn @ 2023-05-15 21:43 ` tip-bot2 for Lukas Bulwahn 0 siblings, 0 replies; 4+ messages in thread From: tip-bot2 for Lukas Bulwahn @ 2023-05-15 21:43 UTC (permalink / raw) To: linux-tip-commits; +Cc: Borislav Petkov, Lukas Bulwahn, x86, linux-kernel The following commit has been merged into the x86/cpu branch of tip: Commit-ID: 7583e8fbdc49a4dbd916d14863cf1deeddb982f9 Gitweb: https://git.kernel.org/tip/7583e8fbdc49a4dbd916d14863cf1deeddb982f9 Author: Lukas Bulwahn <lukas.bulwahn@gmail.com> AuthorDate: Wed, 10 May 2023 08:57:13 +02:00 Committer: Borislav Petkov (AMD) <bp@alien8.de> CommitterDate: Mon, 15 May 2023 20:03:08 +02:00 x86/cpu: Remove X86_FEATURE_NAMES While discussing to change the visibility of X86_FEATURE_NAMES (see Link) in order to remove CONFIG_EMBEDDED, Boris suggested to simply make the X86_FEATURE_NAMES functionality unconditional. As the need for really tiny kernel images has gone away and kernel images with !X86_FEATURE_NAMES are hardly tested, remove this config and the whole ifdeffery in the source code. Suggested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/all/20230509084007.24373-1-lukas.bulwahn@gmail.com/ Link: https://lore.kernel.org/r/20230510065713.10996-3-lukas.bulwahn@gmail.com --- arch/x86/Kconfig | 12 ------------ arch/x86/Kconfig.cpu | 2 +- arch/x86/boot/Makefile | 2 -- arch/x86/boot/cpu.c | 13 ------------- arch/x86/include/asm/cpufeature.h | 5 ----- arch/x86/kernel/cpu/Makefile | 4 +--- arch/x86/kernel/cpu/common.c | 4 ---- 7 files changed, 2 insertions(+), 40 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index a7db116..f6aa7e0 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -291,7 +291,6 @@ config X86 select TRACE_IRQFLAGS_NMI_SUPPORT select USER_STACKTRACE_SUPPORT select HAVE_ARCH_KCSAN if X86_64 - select X86_FEATURE_NAMES if PROC_FS select PROC_PID_ARCH_STATUS if PROC_FS select HAVE_ARCH_NODE_DEV_GROUP if X86_SGX select FUNCTION_ALIGNMENT_16B if X86_64 || X86_ALIGNMENT_16 @@ -441,17 +440,6 @@ config SMP If you don't know what to do here, say N. -config X86_FEATURE_NAMES - bool - default y - help - This option compiles in a table of x86 feature bits and corresponding - names. This is required to support /proc/cpuinfo and a few kernel - messages. You can disable this to save space, at the expense of - making those few kernel messages show numeric feature bits instead. - - If in doubt, say Y. - config X86_X2APIC bool "Support x2apic" depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST) diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu index 542377c..00468ad 100644 --- a/arch/x86/Kconfig.cpu +++ b/arch/x86/Kconfig.cpu @@ -389,7 +389,7 @@ config IA32_FEAT_CTL config X86_VMX_FEATURE_NAMES def_bool y - depends on IA32_FEAT_CTL && X86_FEATURE_NAMES + depends on IA32_FEAT_CTL menuconfig PROCESSOR_SELECT bool "Supported processor vendors" if EXPERT diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile index 9e38ffa..f33e45e 100644 --- a/arch/x86/boot/Makefile +++ b/arch/x86/boot/Makefile @@ -55,14 +55,12 @@ HOST_EXTRACFLAGS += -I$(srctree)/tools/include \ -include include/generated/autoconf.h \ -D__EXPORTED_HEADERS__ -ifdef CONFIG_X86_FEATURE_NAMES $(obj)/cpu.o: $(obj)/cpustr.h quiet_cmd_cpustr = CPUSTR $@ cmd_cpustr = $(obj)/mkcpustr > $@ $(obj)/cpustr.h: $(obj)/mkcpustr FORCE $(call if_changed,cpustr) -endif targets += cpustr.h # --------------------------------------------------------------------------- diff --git a/arch/x86/boot/cpu.c b/arch/x86/boot/cpu.c index 0bbf4f3..feb6dbd 100644 --- a/arch/x86/boot/cpu.c +++ b/arch/x86/boot/cpu.c @@ -14,9 +14,7 @@ */ #include "boot.h" -#ifdef CONFIG_X86_FEATURE_NAMES #include "cpustr.h" -#endif static char *cpu_name(int level) { @@ -35,7 +33,6 @@ static char *cpu_name(int level) static void show_cap_strs(u32 *err_flags) { int i, j; -#ifdef CONFIG_X86_FEATURE_NAMES const unsigned char *msg_strs = (const unsigned char *)x86_cap_strs; for (i = 0; i < NCAPINTS; i++) { u32 e = err_flags[i]; @@ -58,16 +55,6 @@ static void show_cap_strs(u32 *err_flags) e >>= 1; } } -#else - for (i = 0; i < NCAPINTS; i++) { - u32 e = err_flags[i]; - for (j = 0; j < 32; j++) { - if (e & 1) - printf("%d:%d ", i, j); - e >>= 1; - } - } -#endif } int validate_cpu(void) diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h index ce0c8f7..a26bebb 100644 --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -38,15 +38,10 @@ enum cpuid_leafs #define X86_CAP_FMT_NUM "%d:%d" #define x86_cap_flag_num(flag) ((flag) >> 5), ((flag) & 31) -#ifdef CONFIG_X86_FEATURE_NAMES extern const char * const x86_cap_flags[NCAPINTS*32]; extern const char * const x86_power_flags[32]; #define X86_CAP_FMT "%s" #define x86_cap_flag(flag) x86_cap_flags[flag] -#else -#define X86_CAP_FMT X86_CAP_FMT_NUM -#define x86_cap_flag x86_cap_flag_num -#endif /* * In order to save room, we index into this array by doing diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile index d7e3cea..4350f6b 100644 --- a/arch/x86/kernel/cpu/Makefile +++ b/arch/x86/kernel/cpu/Makefile @@ -27,7 +27,7 @@ obj-y += cpuid-deps.o obj-y += umwait.o obj-$(CONFIG_PROC_FS) += proc.o -obj-$(CONFIG_X86_FEATURE_NAMES) += capflags.o powerflags.o +obj-y += capflags.o powerflags.o obj-$(CONFIG_IA32_FEAT_CTL) += feat_ctl.o ifdef CONFIG_CPU_SUP_INTEL @@ -54,7 +54,6 @@ obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o obj-$(CONFIG_HYPERVISOR_GUEST) += vmware.o hypervisor.o mshyperv.o obj-$(CONFIG_ACRN_GUEST) += acrn.o -ifdef CONFIG_X86_FEATURE_NAMES quiet_cmd_mkcapflags = MKCAP $@ cmd_mkcapflags = $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $@ $^ @@ -63,5 +62,4 @@ vmxfeature = $(src)/../../include/asm/vmxfeatures.h $(obj)/capflags.c: $(cpufeature) $(vmxfeature) $(src)/mkcapflags.sh FORCE $(call if_changed,mkcapflags) -endif targets += capflags.c diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 80710a6..849ed7e 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1502,12 +1502,10 @@ static void __init cpu_parse_early_param(void) if (!kstrtouint(opt, 10, &bit)) { if (bit < NCAPINTS * 32) { -#ifdef CONFIG_X86_FEATURE_NAMES /* empty-string, i.e., ""-defined feature flags */ if (!x86_cap_flags[bit]) pr_cont(" " X86_CAP_FMT_NUM, x86_cap_flag_num(bit)); else -#endif pr_cont(" " X86_CAP_FMT, x86_cap_flag(bit)); setup_clear_cpu_cap(bit); @@ -1520,7 +1518,6 @@ static void __init cpu_parse_early_param(void) continue; } -#ifdef CONFIG_X86_FEATURE_NAMES for (bit = 0; bit < 32 * NCAPINTS; bit++) { if (!x86_cap_flag(bit)) continue; @@ -1537,7 +1534,6 @@ static void __init cpu_parse_early_param(void) if (!found) pr_cont(" (unknown: %s)", opt); -#endif } pr_cont("\n"); ^ permalink raw reply related [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-05-15 21:43 UTC | newest] Thread overview: 4+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2023-05-10 6:57 [PATCH 0/2] Reworking configurability of X86_FEATURE_NAMES Lukas Bulwahn 2023-05-10 6:57 ` [PATCH 1/2] x86: make X86_FEATURE_NAMES non-configurable in prompt Lukas Bulwahn 2023-05-10 6:57 ` [PATCH 2/2] x86: always build with X86_FEATURE_NAMES functionality Lukas Bulwahn 2023-05-15 21:43 ` [tip: x86/cpu] x86/cpu: Remove X86_FEATURE_NAMES tip-bot2 for Lukas Bulwahn
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