On Fri, 5 Aug 2016 22:11:58 +1000
Nicholas Piggin <npiggin@xxxxxxxxx> wrote:
> Hello,
>
> I have 3 different things in this patchset. All arch specific, but all
> involve kbuild changes, so I'd like to discuss them with kbuild
> maintainers. The goal has been to improve long standing linking
> difficulties with the powerpc kernel.
Here's a 30 second hack of an x86 patch. It seems to build and
boot defconfig in a really quick kvm test.
For x86-64 machine building x86 target, defconfig,
make -j8 vmlinux time:
orig thinarc thinarc+dce
real 4m58.865s 4m59.747s 5m20.028s
user 15m14.428s 15m13.868s 15m17.012s
sys 0m57.296s 0m55.904s 0m58.416s
build output directory size:
orig thinarc thinarc+dce
317M 257M 285M
vmlinux size:
text data bss dec filename
10192338 4360136 1105920 15658394 vmlinux
10186739 4356040 1105920 15648699 vmlinux.thinarc
9580486 3759880 1011712 14352078 vmlinux.thinarc+dce
Thanks,
Nick
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0a7b885..845069e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -51,6 +51,8 @@ config X86
select ARCH_WANT_IPC_PARSE_VERSION if X86_32
select ARCH_WANT_OPTIONAL_GPIOLIB
select BUILDTIME_EXTABLE_SORT
+ select THIN_ARCHIVES
+ select LINKER_DCE
select CLKEVT_I8253
select CLKSRC_I8253 if X86_32
select CLOCKSOURCE_VALIDATE_LAST_CYCLE
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 9297a00..7395dd8 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -92,7 +92,7 @@ SECTIONS
.text : AT(ADDR(.text) - LOAD_OFFSET) {
_text = .;
/* bootstrapping code */
- HEAD_TEXT
+ KEEP(HEAD_TEXT)
. = ALIGN(8);
_stext = .;
TEXT_TEXT
@@ -321,7 +321,7 @@ SECTIONS
.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
__bss_start = .;
*(.bss..page_aligned)
- *(.bss)
+ *(.bss .bss.*)
. = ALIGN(PAGE_SIZE);
__bss_stop = .;
}
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