linux-kernel - Re: [PATCH 01/28] nios2: Build infrastructure

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Date:	Mon, 21 Apr 2014 11:03:08 +0800
From:	Ley Foon Tan <lftan@...era.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <lftan.linux@...il.com>,
	<cltang@...esourcery.com>
Subject: Re: [PATCH 01/28] nios2: Build infrastructure

On Jum, 2014-04-18 at 16:35 +0200, Sam Ravnborg wrote:
> It is good practice to add build infrastructure last - so build is not broken.
> But for a new architecture it matters only little.
> 
> Some comments in the following.
> 
> 	Sam
Noted. But, I will keep the patch # for this time for consistency.
Thanks. 
> > 
> > Signed-off-by: Ley Foon Tan <lftan@...era.com>
> > ---
> > 
> > diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
> > new file mode 100644
> > index 0000000..2bd0d0d7160f31a5c5890cf8a059b9f53378be6e
> > --- /dev/null
> > +++ b/arch/nios2/Kconfig
> > @@ -0,0 +1,213 @@
> > +config NIOS2
> > +	def_bool y
> > +	select OF
> > +	select OF_EARLY_FLATTREE
> > +	select USB_ARCH_HAS_HCD if USB_SUPPORT
> > +	select ARCH_WANT_OPTIONAL_GPIOLIB
> > +	select GENERIC_IRQ_PROBE
> > +	select GENERIC_IRQ_SHOW
> > +	select GENERIC_CPU_DEVICES
> > +	select GENERIC_ATOMIC64
> > +	select MODULES_USE_ELF_RELA
> > +	select IRQ_DOMAIN
> > +	select SOC_BUS
> > +	select CLKSRC_OF
> If you keep this list sorted then merge issues are less likely.
Noted, will sort this list.

> > +config KERNEL_MMU_REGION_BASE_BOOL
> > +	bool "Set custom kernel MMU region base address"
> > +	depends on ADVANCED_OPTIONS
> > +	help
> > +	  This option allows you to set the virtual address of the kernel MMU region.
> > +
> > +	  Say N here unless you know what you are doing.
> 
> All Nios2 specific options should be prefixed with NIOS2_
> This is what is done for all new arch specific symbols.
Noted, will add NIOS2 prefix to these CONFIGs.
> 
> > diff --git a/arch/nios2/boot/Makefile b/arch/nios2/boot/Makefile

> > +	$(call if_changed,gzip)
> > +
> > +$(obj)/vmImage: $(obj)/vmlinux.gz
> > +	$(call if_changed,uimage)
> > +	@$(kecho) 'Kernel: $@ is ready'
> 
> Add:
> targets += vmlinux.bin vmlinux.gz vmImage
> to make $(call if_changed ... actually work.
Sure, will change to this way.

> 
> 
> > +obj-y += cpuinfo.o insnemu.o irq.o nios2_ksyms.o process.o prom.o ptrace.o \
> > +	 setup.o signal.o sys_nios2.o syscall_table.o time.o traps.o
> 
> In new stuff try to avoid using ... \
> to contatenate lines.
> Use:
> obj-y += xxx
> 
> This is much more readable.
> 
Will fix this.
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