Re: [PATCH] MIPS: loongson2ef: don't build serial.o unconditionally

[Thomas Bogendoerfer <tsbogend@alpha.franken.de>]

On Wed, Aug 04, 2021 at 05:02:16PM -0700, Randy Dunlap wrote:
> LOONGSON_UART_BASE depends on EARLY_PRINTK || SERIAL_8250, but when
> neither of these Kconfig symbols is set, the kernel build has errors:
> 
> ../arch/mips/loongson2ef/common/serial.c: In function 'serial_init':
> ../arch/mips/loongson2ef/common/serial.c:66:25: error: 'loongson_uart_base' undeclared (first use in this function)
>    66 |                         loongson_uart_base;
> ../arch/mips/loongson2ef/common/serial.c:66:25: note: each undeclared identifier is reported only once for each function it appears in
> ../arch/mips/loongson2ef/common/serial.c:68:41: error: '_loongson_uart_base' undeclared (first use in this function)
>    68 |                         (void __iomem *)_loongson_uart_base;
> 
> Fix this by building serial.o only when one (or both) of these
> Kconfig symbols is enabled.
> 
> Tested with:
> 	(a) EARLY_PRINTK=y, SERIAL_8250 not set;
> 	(b) EARLY_PRINTK=y, SERIAL_8250=y;
> 	(c) EARLY_PRINTK=y, SERIAL_8250=m.
> 	(d) EARLY_PRINTK not set, SERIAL_8250=y;
> 	(e) EARLY_PRINTK not set, SERIAL_8250=m;
> 	(f) EARLY_PRINTK not set, SERIAL_8250 not set.
> 
> Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
> Reported-by: kernel test robot <lkp@intel.com>
> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: linux-mips@vger.kernel.org
> ---
>  arch/mips/loongson2ef/common/Makefile |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

applied to mips-next.

Thomas.

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