Messages in this thread | | | Date | Mon, 4 Jun 2012 10:36:43 -0400 | From | Don Zickus <> | Subject | Re: WARNING: arch/x86/built-in.o: Section mismatch in reference from the variable test_nmi_ipi_callback_na to function .ini.text:test_nmi_ipi_callback |
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On Sat, Jun 02, 2012 at 06:15:02PM +0200, Witold Baryluk wrote: > Hello everybody, > > x86 32-bit Build just got 2 WARNINGS when building kernel on Linus' tree.
Hi Witold,
Thanks for the warnings.
> > > VDSOSYM arch/x86/vdso/vdso32-syms.lds > LD arch/x86/vdso/built-in.o > LD arch/x86/built-in.o > WARNING: arch/x86/built-in.o(.data+0x5af0): Section mismatch in reference from the variable test_nmi_ipi_callback_na.10451 to the function .init.text:test_nmi_ipi_callback() > The variable test_nmi_ipi_callback_na.10451 references > the function __init test_nmi_ipi_callback() > If the reference is valid then annotate the > variable with __init* or __refdata (see linux/init.h) or name the variable: > *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console > > WARNING: arch/x86/built-in.o(.data+0x5b04): Section mismatch in reference from the variable nmi_unk_cb_na.10399 to the function .init.text:nmi_unk_cb() > The variable nmi_unk_cb_na.10399 references > the function __init nmi_unk_cb() > If the reference is valid then annotate the > variable with __init* or __refdata (see linux/init.h) or name the variable: > *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console
These are intermediate variables test_nmi_ipi_callback_na.10451 and nmi_unk_cb_na.10399. I do not know how to fix them.
Basically the test registers two nmi_handlers, run some tests, and then unregisters them. Those handlers are what the compiler seems to be complaining about. I do not know what magic to pass the compiler to let it know that both of the handlers will be unregistered before the init section is destroyed.
Perhaps I should tag those callbacks with __ref? I am not sure the right thing to do here.
Cheers, Don
> > LD vmlinux.o > MODPOST vmlinux.o > WARNING: vmlinux.o(.data+0x7cf0): Section mismatch in reference from the variable test_nmi_ipi_callback_na.10451 to the function .init.text:test_nmi_ipi_callback() > The variable test_nmi_ipi_callback_na.10451 references > the function __init test_nmi_ipi_callback() > If the reference is valid then annotate the > variable with __init* or __refdata (see linux/init.h) or name the variable: > *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console > > WARNING: vmlinux.o(.data+0x7d04): Section mismatch in reference from the variable nmi_unk_cb_na.10399 to the function .init.text:nmi_unk_cb() > The variable nmi_unk_cb_na.10399 references > the function __init nmi_unk_cb() > If the reference is valid then annotate the > variable with __init* or __refdata (see linux/init.h) or name the variable: > *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console > > GEN .version > CHK include/generated/compile.h > > > > > This is recent change. > > gcc version 4.7.0 (Debian 4.7.0-11) > > Debian sid, i386. > > -- > Witold Baryluk
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