x86: extend processor type select help text

extend the help text of the CONFIG_CPU_SUP_* config options to
express what it does and what effects it has.
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/Kconfig.cpu

@@ -430,48 +430,97 @@ config CPU_SUP_INTEL
 	default y
 	bool "Support Intel processors" if PROCESSOR_SELECT
 	help
-	  This enables extended support for Intel processors
+	  This enables detection, tunings and quirks for Intel processors
+
+	  You need this enabled if you want your kernel to run on an
+	  Intel CPU. Disabling this option on other types of CPUs
+	  makes the kernel a tiny bit smaller. Disabling it on an Intel
+	  CPU might render the kernel unbootable.
+
+	  If unsure, say N.
 
 config CPU_SUP_CYRIX_32
 	default y
 	bool "Support Cyrix processors" if PROCESSOR_SELECT
 	depends on !64BIT
 	help
-	  This enables extended support for Cyrix processors
+	  This enables detection, tunings and quirks for Cyrix processors
+
+	  You need this enabled if you want your kernel to run on a
+	  Cyrix CPU. Disabling this option on other types of CPUs
+	  makes the kernel a tiny bit smaller. Disabling it on a Cyrix
+	  CPU might render the kernel unbootable.
+
+	  If unsure, say N.
 
 config CPU_SUP_AMD
 	default y
 	bool "Support AMD processors" if PROCESSOR_SELECT
 	help
-	  This enables extended support for AMD processors
+	  This enables detection, tunings and quirks for AMD processors
+
+	  You need this enabled if you want your kernel to run on an
+	  AMD CPU. Disabling this option on other types of CPUs
+	  makes the kernel a tiny bit smaller. Disabling it on an AMD
+	  CPU might render the kernel unbootable.
+
+	  If unsure, say N.
 
 config CPU_SUP_CENTAUR_32
 	default y
 	bool "Support Centaur processors" if PROCESSOR_SELECT
 	depends on !64BIT
 	help
-	  This enables extended support for Centaur processors
+	  This enables detection, tunings and quirks for Centaur processors
+
+	  You need this enabled if you want your kernel to run on a
+	  Centaur CPU. Disabling this option on other types of CPUs
+	  makes the kernel a tiny bit smaller. Disabling it on a Centaur
+	  CPU might render the kernel unbootable.
+
+	  If unsure, say N.
 
 config CPU_SUP_CENTAUR_64
 	default y
 	bool "Support Centaur processors" if PROCESSOR_SELECT
 	depends on 64BIT
 	help
-	  This enables extended support for Centaur processors
+	  This enables detection, tunings and quirks for Centaur processors
+
+	  You need this enabled if you want your kernel to run on a
+	  Centaur CPU. Disabling this option on other types of CPUs
+	  makes the kernel a tiny bit smaller. Disabling it on a Centaur
+	  CPU might render the kernel unbootable.
+
+	  If unsure, say N.
 
 config CPU_SUP_TRANSMETA_32
 	default y
 	bool "Support Transmeta processors" if PROCESSOR_SELECT
 	depends on !64BIT
 	help
-	  This enables extended support for Transmeta processors
+	  This enables detection, tunings and quirks for Transmeta processors
+
+	  You need this enabled if you want your kernel to run on a
+	  Transmeta CPU. Disabling this option on other types of CPUs
+	  makes the kernel a tiny bit smaller. Disabling it on a Transmeta
+	  CPU might render the kernel unbootable.
+
+	  If unsure, say N.
 
 config CPU_SUP_UMC_32
 	default y
 	bool "Support UMC processors" if PROCESSOR_SELECT
 	depends on !64BIT
 	help
-	  This enables extended support for UMC processors
+	  This enables detection, tunings and quirks for UMC processors
+
+	  You need this enabled if you want your kernel to run on a
+	  UMC CPU. Disabling this option on other types of CPUs
+	  makes the kernel a tiny bit smaller. Disabling it on a UMC
+	  CPU might render the kernel unbootable.
+
+	  If unsure, say N.
 
 config X86_DS
 	bool "Debug Store support"