On Mon, Jan 17, 2011 at 05:49:00PM +0530, Santosh Shilimkar wrote: > > -----Original Message----- > > From: Russell King [mailto:rmk@xxxxxxxxxxxxxxxx] > > Sent: Monday, January 17, 2011 5:42 PM > > To: Santosh Shilimkar > > Cc: Aaro Koskinen; Tony Lindgren; linux-omap@xxxxxxxxxxxxxxx > > Subject: Re: Open issues after 2.6.38 merge window > > > > On Mon, Jan 17, 2011 at 05:29:01PM +0530, Santosh Shilimkar wrote: > > > > On Fri, 14 Jan 2011, Tony Lindgren wrote: > > > > > Before I update out master branch, let's try to summarize the > > > > > open issues after the merge window. Here's a list of issues > > > > > in omap-fixes-for-linus that I'm aware of: > > > > > > > > > > - NFS root oopses while mounting root > > > > > > > > > > - omap4430 es1.0 hangs if L2X0 cache is enabled > > > > > > > > > > - omap4 panda powers down after boot (watchdog?) > > > > > > > > > > - omap3 ldp board powers down after boot? > > > > This doesn't happen for me. > > > > > > > > > > > > Any other issues? > > > > > > > > Amstrad E3 fails during the boot. Bisection points to: > > > > > > > > commit 211baa7016894c02fc18693e21ca479cd08ac0c0 > > > > Author: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> > > > > Date: Tue Jan 11 16:23:04 2011 +0000 > > > > > > > > ARM: sched_clock: allow init_sched_clock() to be called > > > > early > > > > > > > > The board does not have sched_clock(), although HAVE_SCHED_CLOCK > > is > > > > defined for all OMAP. > > > > > > > I guess above is sorted out by the attached patch from Paul. > > > > There's an issue missing from Tony's list: > > > > - running an omap2plus_defconfig kernel on SMP is unsafe to the > > point > > of being data corrupting for filesystems, especially for ext2/ext3 > > mounted read-write. > > > > This is because when CPU_32v6K is disabled - which is required to > > build > > a kernel to boot on ARMv6, it turns off the SMP safe bitops - the > > SMP > > safe bitops only use instructions available to ARMv6K and above. > > They > > are reduced to local-irq-disabling, plain byte loads and stores. > > > > So, running omap2plus_defconfig on SMP is risking filesystem > > corruption. > > > > Patches for this are being worked on, but they won't be ready for - > > rc1. > > I strongly suggest someone restores some kind of build or runtime > > error > > (eg, by removing CPU_32v6K's dependence on !OMAP2 - thereby > > _intentionally_ > > breaking omap2plus_defconfig) before someone ends up with a > > corrupted > > filesystem. Or just make sure that everyone is aware that > > omap2plus_defconfig can eat filesystems at the moment. > > > Thanks. I missed your other patch of removing !OMAP2 from > CPU_32v6K config. With the problems addressed, I think that removal of !OMAP2 is not strictly required - but I don't like the idea of disabling CPU_32v6K in general as we can't ensure that this kind of thing doesn't happen in the future. Not disabling CPU_32v6K also fixes the swp_emulate build problem too (which is why I've never seen it here.) There are several V6K bits that need to be addressed (such as a single clrex vs two instruction strex) before we can properly build a kernel supporting V6 but also containing V6K extensions. -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
