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. --- ~Randy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
