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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 Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.