[Re: nommu build failures on ARM in linux-next] On 30/05/2014 (Fri 00:40) Russell King - ARM Linux wrote: > On Thu, May 29, 2014 at 07:55:34PM +0100, Russell King - ARM Linux wrote: > > On Thu, May 29, 2014 at 12:53:51PM -0400, Paul Gortmaker wrote: > > > Hi Russell, > > > > > > The allnoconfig builds in linux-next fail because __clear_cr > > > lives in mmu.c without any stub or similar in nommu.c > > > > > > Introduced by: > > > > > > commit 247e4fff3aa927ad069447e6da05bb966b70dece > > > Author: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> > > > Date: Sun Apr 13 18:57:29 2014 +0100 > > > > > > ARM: provide common method to clear bits in CPU control register > > > > > > Sample failure: > > > http://kisskb.ellerman.id.au/kisskb/buildresult/11264405/ > > > > ALIGNMENT_TRAP depends on CPU_CP15_MMU, so it's quite reasonable that > > __clear_cr should exist in this case - but it doesn't because it's in > > mmu.c. I guess we need __clear_cr moved to arch/arm/kernel/setup.c. > > I've been looking at doing this, and while it can be done by applying > a patch on top, that's not my preferred solution. > > However, my preferred solution (which is to fix the commit) needs a bit > of rework of the patch series, and given the number of patches I'm > carrying right now, I'm just going to drop the branch out of linux-next > and hold it off until the following merge window instead. > > Even so, I suspect even with this build problem solved, that's not going > to be the end of the story for noMMU breakage... it's certainly something > that gets very little testing by anyone. I suspect it should be removed > from the mainline kernel tree rather than being a constant source of these > kinds of problems. One doesn't have to look very far to see that I'm in favour of pushing obsolete options/drivers/subsystems off a cliff if I can get away with it, so that we don't get crushed under our own weight/complexity. So if you really think it is time for ARM noMMU to go, I'll volunteer to craft up a removal series for you for 3.17 -- just say the word. Paul. -- > > -- > FTTC broadband for 0.8mile line: now at 9.7Mbps down 460kbps up... slowly > improving, and getting towards what was expected from it. -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
