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Date: Sat, 19 Jan 2008 22:22:42 +0100 From: Sam Ravnborg <sam@...nborg.org> To: Randy Dunlap <randy.dunlap@...cle.com> Cc: LKML <linux-kernel@...r.kernel.org>, akpm <akpm@...ux-foundation.org> Subject: Re: Help needed to fix section mismatch warnings On Sat, Jan 19, 2008 at 11:52:55AM -0800, Randy Dunlap wrote: > On Sun, 6 Jan 2008 15:07:28 +0100 Sam Ravnborg wrote: > > > kbuild emit section mismatch warnings when it detects that someone does a > > call from a non-init section to a init section. > > The rationale here is that the init section are discarded at runtime and > > if this call happens after the init section has gone we have an oops. > > > > This check is planned to be turned into an error soon but we still > > see a bit too many warnings. > > > > To see the list below build a kernel like this: > > > > make allyesconfig > > Set CONFIG_HOTPLUG to n > > (In General Setup | Configure standard kernel features | Support for hot-plugable devices) > > > > Then build the kernel like this: > > make KCFLAGS=-fno-unit-at-a-time > > > > The flag "-fno-unit-at-a-time" tell gcc to avoid additional inlining which > > otherwise would hide several section mismatch warnings. > > > > With latest kernel I got 113 warnings and most should fixable. > > Try to look at how other section mismatch warnings has been fixed for inspiration. > > > > Patches can be cc:ed to me but always send it to the maintainer and lkml. > > > > Sam > > > > This is the current list of warnings > > > > WARNING: vmlinux.o(.text+0x1ffd0): Section mismatch: reference to .init.text:register_cpu (between 'arch_register_cpu' and 'arch_unregister_cpu') > > > WARNING: vmlinux.o(.text+0x21a39): Section mismatch: reference to .init.text:absent_pages_in_range (between 'reserve_hotadd' and 'unparse_node') > > WARNING: vmlinux.o(.text+0x21ae9): Section mismatch: reference to .init.data: (between 'unparse_node' and 'null_slit_node_compare') > > > WARNING: vmlinux.o(.text+0x38b43): Section mismatch: reference to .init.text:idle_regs (between 'fork_idle' and 'fork_traceflag') > > Above 4 seem to be mostly fixed in -mm. I made patches for them > and then checked -mm, so I won't post the patches... > > > > WARNING: vmlinux.o(.text+0x43524): Section mismatch: reference to .init.text: (between 'timer_cpu_notify' and 'msleep') > > WARNING: vmlinux.o(.text+0x4c6f6): Section mismatch: reference to .init.text: (between 'rcu_cpu_notify' and 'wakeme_after_rcu') > > WARNING: vmlinux.o(.text+0x51cbe): Section mismatch: reference to .init.text: (between 'hrtimer_cpu_notify' and 'down_read_trylock') > > I'll post patches for the 3 above. However, the rcu code in -mm > is quite different, so the rcu patch may have a short life. Hi Randy. Thanks for your efforts! Sam -- 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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