[PATCH v5 01/10] x86/resctrl: Require 64-bit x86 for resctrl support

[Chen Yu]

All known hardware that supports Intel RDT or AMD QoS is 64-bit. Future
enhancements like MMIO-based Enhanced RDT (ERDT) monitoring require
readq()/writeq() which are only available on 64-bit. There is also no
realistic use case for users to build a 32-bit kernel on a server and
enable resctrl.

Drop 32-bit support by changing the X86_CPU_RESCTRL dependency from X86
to X86_64.

Since X86_CPU_RESCTRL now implies X86_64, remove the redundant X86_64
dependency from X86_CPU_RESCTRL_INTEL_AET.

Tested-by: Hongyu Ning <hongyu.ning@xxxxxxxxxxxxxxx>
Signed-off-by: Chen Yu <yu.c.chen@xxxxxxxxx>
---
v4->v5:
    New patch. Split from previous patch in v4.
---
 arch/x86/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index fa4f0079614c..b2c2b10f8a57 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -514,7 +514,7 @@ config X86_MPPARSE
 
 config X86_CPU_RESCTRL
 	bool "x86 CPU resource control support"
-	depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
+	depends on X86_64 && (CPU_SUP_INTEL || CPU_SUP_AMD)
 	depends on MISC_FILESYSTEMS
 	select ARCH_HAS_CPU_RESCTRL
 	select RESCTRL_FS
@@ -537,7 +537,7 @@ config X86_CPU_RESCTRL
 
 config X86_CPU_RESCTRL_INTEL_AET
 	bool "Intel Application Energy Telemetry"
-	depends on X86_64 && X86_CPU_RESCTRL && CPU_SUP_INTEL && INTEL_PMT_TELEMETRY=y && INTEL_TPMI=y
+	depends on X86_CPU_RESCTRL && CPU_SUP_INTEL && INTEL_PMT_TELEMETRY=y && INTEL_TPMI=y
 	help
 	  Enable per-RMID telemetry events in resctrl.
 
-- 
2.45.2