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Date: Tue, 04 Jun 2013 17:07:39 +0200 From: Arnd Bergmann <arnd@...db.de> To: David Miller <davem@...emloft.net> Cc: alexandre.belloni@...e-electrons.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk, shawn.guo@...aro.org, kernel@...gutronix.de Subject: Re: [PATCHv2 1/3] net: phy: prevent linking breakage On Thursday 30 May 2013 02:42:01 David Miller wrote: > From: Alexandre Belloni <alexandre.belloni@...e-electrons.com> > > On 28/05/2013 22:09, David Miller wrote: > > But that is making it impossible to compile a kernel without any network > > stack for those platforms or we are going back to either enclosing the > > calls to phy_register_fixup{,_for_uid,_for_id} with #ifdef CONFIG_PHYLIB > > or if(IS_BUILTIN(CONFIG_PHYLIB)). And as you can see, it is quite error > > prone and is done only done for 2 platforms on a total of 6. I believe > > fixing that in phy.h is more foolproof. > > Or you properly segregate the networking bits of the platform code so > that it can be built only when the necessary networking portions are > enabled. > > Sometimes having dummy stubs makes sense, but not in this situation. Currently most users of this function are doing something like static int foo_phy_fixup(struct phy_device *phydev) { ... } static int __init boo_board_init(void) { if (IS_BUILTIN(CONFIG_PHYLIB)) phy_register_fixup_for_uid(phy_id, foo_phy_fixup); } which is practically the same as having a dummy stub. It leads to the foo_phy_fixup() function always getting compiled and then discarded by gcc when CONFIG_PHYLIB is disabled. The method is currently broken when network drivers are enabled as modules, because we are missing the fixup then. I think we should use IS_ENABLED() here to force a build error in that case, and have something like config ARCH_FOO bool "support for the foo platform" select PHYLIB if NET in the platform Kconfig file, to ensure PHYLIB is always built-in. I still think the inline alternatives would be helpful, but using if (IS_ENABLED(CONFIG_PHYLIB)) in the platform code would also work. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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