Hello all, In linux 5.4.21 source code, I put #pragma GCC push_options #pragma GCC optimize ("O0") and #pragma GCC pop_options around function static int __init gic_init_bases in file drivers/irqchip/irq-gic-v3.c. When I build it, I get this warning message (section mismatch). ( I later found it is actually the “#pragma GCC optimize ("O0")” line that is causing it.) CALL scripts/atomic/check-atomics.sh CALL scripts/checksyscalls.sh CHK include/generated/compile.h CC arch/arm64/kernel/irq.o CC arch/arm64/kernel/setup.o CC drivers/irqchip/irq-gic-v3.o AS arch/arm64/kernel/head.o AR arch/arm64/kernel/built-in.a AR arch/arm64/built-in.a AR drivers/irqchip/built-in.a AR drivers/built-in.a GEN .version CHK include/generated/compile.h UPD include/generated/compile.h CC init/version.o AR init/built-in.a LD vmlinux.o MODPOST vmlinux.o WARNING: vmlinux.o(.text+0x227cc0): Section mismatch in reference from the function gic_smp_init() to the function .init.text:set_smp_cross_call() The function gic_smp_init() references the function __init set_smp_cross_call(). This is often because gic_smp_init lacks a __init annotation or the annotation of set_smp_cross_call is wrong. MODINFO modules.builtin.modinfo LD .tmp_vmlinux1 KSYM .tmp_kallsyms1.o LD .tmp_vmlinux2 KSYM .tmp_kallsyms2.o LD vmlinux SORTEX vmlinux SYSMAP System.map OBJCOPY arch/arm64/boot/Image Function call is like this : gic_init_bases -> gic_smp_init() -> set_smp_cross_call. (currently CONFIG_SMP=y). The message seems to say set_smp_cross_call is annotated with __init (meaning it is placed in .init.text) but gic_smp_init is not. But without the #pragma debug setting, there was not warning of this kind. I'm not sure if I can just add add __init to gic_smp_init(). (or remove _init from set_smp_cross_call ) What is the correct method to fix it? Thanks, Chan Kim |
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