On Mon, Nov 16, 2015 at 10:32:51AM +0000, yamada.masahiro@xxxxxxxxxxxxx wrote: > Hi Arnd, > > > > On Monday 16 November 2015 12:06:10 Masahiro Yamada wrote: > > > Many ARM sub-architectures use prompts followed by "if" conditional, > > > but it is wrong. > > > > > > Please notice the difference between > > > > > > config ARCH_FOO > > > bool "Foo SoCs" if ARCH_MULTI_V7 > > > > > > and > > > > > > config ARCH_FOO > > > bool "Foo SoCs" > > > depends on ARCH_MULTI_V7 > > > > > > These two are *not* equivalent! > > > > > > In the former statement, it is not ARCH_FOO, but its prompt that > > > depends on ARCH_MULTI_V7. So, it is completely valid that ARCH_FOO is > > > selected by another, but ARCH_MULTI_V7 is still disabled. As it is not > > > unmet dependency, Kconfig never warns. This is probably not what you > > > want. > > > > Did you encounter a case where someone actually did a 'select' on one of > > those symbols? I probably introduced a lot of them and did not expect that > > to happen. > > No, for ARM sub-architectures. > But, yes for the ARM core part. > > > For example, the following entry in arch/arm/Kconfig is suspicous. > > config PCI > bool "PCI support" if MIGHT_HAVE_PCI > help > Find out whether you have a PCI motherboard. PCI is the name of a > bus system, i.e. the way the CPU talks to the other stuff inside > your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or > VESA. If you have PCI, say Y, otherwise N. > > > > > Try "make ARCH=arm footbridge_defconfig" and check the .config file. > > It defines CONFIG_PCI=y, but not CONFIG_MIGHT_HAVE_PCI. > I am not sure this is a sane .config or not. It's correct. "MIGHT_HAVE_PCI" is used by platforms which _might_ _have_ _PCI_, not by platforms which _do_ _have_ _PCI_. Platforms which _do_ _have_ _PCI_ select PCI directly, and because "MIGHT_HAVE_PCI" is not set, users are not offered an option that they can never disable. -- FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
