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Subject[PATCH] arch/x86/realmode: make trampoline code conditional for x86-32
Date
Trampoline code is only needed for SMP and in x86-64 for wakeup
code. Make it conditional in order to minimize the kernel size.
Added a new hidden config option CONFIG_X86_TRAMPOLINE as
suggested by H. Peter Anvin.

The justification for this patch is tinyfication effort run by
Josh Triplett. In embedded world a 32-bit processor without SMP
is not uncommon phenomenon.

I think the trampoline code could be completely ripped off if
ACPI_SLEEP and INTEL_TXT are not enabled but did not want to
include that yet into this patch.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
arch/x86/Kconfig | 4 ++++
arch/x86/realmode/rm/Makefile | 10 +++++-----
2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f2327e8..9603ca3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2488,6 +2488,10 @@ config PMC_ATOM
def_bool y
depends on PCI

+config X86_TRAMPOLINE
+ def_bool y
+ depends on X86_64 || SMP
+
source "net/Kconfig"

source "drivers/Kconfig"
diff --git a/arch/x86/realmode/rm/Makefile b/arch/x86/realmode/rm/Makefile
index 7c0d7be..299e450 100644
--- a/arch/x86/realmode/rm/Makefile
+++ b/arch/x86/realmode/rm/Makefile
@@ -19,11 +19,11 @@ wakeup-objs += video-vga.o
wakeup-objs += video-vesa.o
wakeup-objs += video-bios.o

-realmode-y += header.o
-realmode-y += trampoline_$(BITS).o
-realmode-y += stack.o
-realmode-y += reboot.o
-realmode-$(CONFIG_ACPI_SLEEP) += $(wakeup-objs)
+realmode-y += header.o
+realmode-$(CONFIG_X86_TRAMPOLINE) += trampoline_$(BITS).o
+realmode-y += stack.o
+realmode-y += reboot.o
+realmode-$(CONFIG_ACPI_SLEEP) += $(wakeup-objs)

targets += $(realmode-y)

--
2.1.0


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