[PATCH 6/9] kernel/x86: enable x32 support for amd64

[Elliott Mitchell]

Full amd64 support isn't really appropriate for most situations
OpenWRT is deployed.  Whereas x86-x32 seems extremely appropriate for
these situations.  As such enable x86-x32 support.

CONFIG_ARCH_MMAP_RND_COMPAT_BITS is required to follow along,
otherwise the kernel build breaks.

Signed-off-by: Elliott Mitchell <ehem+openwrt at m5p.com>
---
I suggest OpenWRT should be placing quite a bit of effort towards
x86-x32.  x86-x32 seems a rather superior generic target for OpenWRT.
Only issue is it could be valuable to have at least minimal amd64
userland support alongside the x86-x32 version.
---
 target/linux/x86/64/config-5.10 | 1 -
 target/linux/x86/64/config-5.15 | 1 -
 target/linux/x86/config-5.10    | 2 ++
 target/linux/x86/config-5.15    | 2 ++
 4 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/target/linux/x86/64/config-5.10 b/target/linux/x86/64/config-5.10
index 1515f90932..de93495fb1 100644
--- a/target/linux/x86/64/config-5.10
+++ b/target/linux/x86/64/config-5.10
@@ -470,7 +470,6 @@ CONFIG_X86_PM_TIMER=y
 # CONFIG_X86_POWERNOW_K8 is not set
 # CONFIG_X86_VSYSCALL_EMULATION is not set
 CONFIG_X86_X2APIC=y
-# CONFIG_X86_X32 is not set
 CONFIG_XEN=y
 CONFIG_XENFS=y
 CONFIG_XEN_512GB=y
diff --git a/target/linux/x86/64/config-5.15 b/target/linux/x86/64/config-5.15
index a20891ea55..39e5064e53 100644
--- a/target/linux/x86/64/config-5.15
+++ b/target/linux/x86/64/config-5.15
@@ -493,7 +493,6 @@ CONFIG_X86_PM_TIMER=y
 # CONFIG_X86_POWERNOW_K8 is not set
 # CONFIG_X86_VSYSCALL_EMULATION is not set
 CONFIG_X86_X2APIC=y
-# CONFIG_X86_X32 is not set
 CONFIG_XEN=y
 CONFIG_XENFS=y
 CONFIG_XEN_512GB=y
diff --git a/target/linux/x86/config-5.10 b/target/linux/x86/config-5.10
index afb7adc63a..8be829d549 100644
--- a/target/linux/x86/config-5.10
+++ b/target/linux/x86/config-5.10
@@ -12,6 +12,7 @@ CONFIG_ARCH_HIBERNATION_POSSIBLE=y
 CONFIG_ARCH_MAY_HAVE_PC_FDC=y
 CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
 CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
+CONFIG_ARCH_MMAP_RND_COMPAT_BITS=8
 CONFIG_ARCH_RANDOM=y
 CONFIG_ARCH_SELECT_MEMORY_MODEL=y
 CONFIG_ARCH_SPARSEMEM_ENABLE=y
@@ -423,6 +424,7 @@ CONFIG_X86_UP_IOAPIC=y
 CONFIG_X86_USE_PPRO_CHECKSUM=y
 CONFIG_X86_VERBOSE_BOOTUP=y
 CONFIG_X86_VMX_FEATURE_NAMES=y
+CONFIG_X86_X32=y
 CONFIG_XZ_DEC_BCJ=y
 CONFIG_XZ_DEC_X86=y
 CONFIG_ZLIB_INFLATE=y
diff --git a/target/linux/x86/config-5.15 b/target/linux/x86/config-5.15
index b59e809127..afe66b27b1 100644
--- a/target/linux/x86/config-5.15
+++ b/target/linux/x86/config-5.15
@@ -13,6 +13,7 @@ CONFIG_ARCH_MAY_HAVE_PC_FDC=y
 CONFIG_ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE=y
 CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
 CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
+CONFIG_ARCH_MMAP_RND_COMPAT_BITS=8
 CONFIG_ARCH_NR_GPIO=512
 CONFIG_ARCH_RANDOM=y
 CONFIG_ARCH_SELECT_MEMORY_MODEL=y
@@ -428,6 +429,7 @@ CONFIG_X86_UP_IOAPIC=y
 CONFIG_X86_USE_PPRO_CHECKSUM=y
 CONFIG_X86_VERBOSE_BOOTUP=y
 CONFIG_X86_VMX_FEATURE_NAMES=y
+CONFIG_X86_X32=y
 CONFIG_XZ_DEC_BCJ=y
 CONFIG_XZ_DEC_X86=y
 CONFIG_ZLIB_INFLATE=y
-- 
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