Section mismatch warnings - not only a warning

Hi Beta68, When I build here, I get some "Section mismatch" warnings from the linker. First I thought it was from one of my changes, but they also show up with your code. Without the DEBUG macro below it only shows a short summary that can be easily overlooked.

I analyzed the sources and fixed it in my fork: "Fix linker warning "mismatched sections". Could even cause a crash." fc5a0d860c8e60b7f2a249e02041a2bebfbb9e15. Root cause are some init and initdata attributes. These tell the kernel this code is only used at startup, so it can later free this memory. Can be dangerous and cause a crash.

I currently build with the toolchain from CoreElec (GCC 10.2), but I think older linkers should complain as well. Tomorrow I can check building native on my N2+.

There a more changes than this one. If you want to merge code back, we probably should talk.... Many regards, Dieter

My make line: make CONFIG_DEBUG_SECTION_MISMATCH=y -j6 >k.log

Section Mismatch

WARNING: drivers/amlogic/ddr_tool/built-in.o(.text.unlikely+0x80): Section mismatch in reference from the function dmc_monitor_probe() to the function .init.text:ddr_find_port_desc()
The function dmc_monitor_probe() references
the function __init ddr_find_port_desc().
This is often because dmc_monitor_probe lacks a __init
annotation or the annotation of ddr_find_port_desc is wrong.

WARNING: drivers/amlogic/ddr_tool/built-in.o(.text.unlikely+0x1dc): Section mismatch in reference from the function dmc_monitor_probe() to the variable .init.data:init_start_addr
The function dmc_monitor_probe() references
the variable __initdata init_start_addr.
This is often because dmc_monitor_probe lacks a __initdata
annotation or the annotation of init_start_addr is wrong.

WARNING: drivers/amlogic/ddr_tool/built-in.o(.text.unlikely+0x1e0): Section mismatch in reference from the function dmc_monitor_probe() to the variable .init.data:init_start_addr
The function dmc_monitor_probe() references
the variable __initdata init_start_addr.
This is often because dmc_monitor_probe lacks a __initdata
annotation or the annotation of init_start_addr is wrong.

WARNING: drivers/amlogic/ddr_tool/built-in.o(.text.unlikely+0x1ec): Section mismatch in reference from the function dmc_monitor_probe() to the variable .init.data:init_start_addr
The function dmc_monitor_probe() references
the variable __initdata init_start_addr.
This is often because dmc_monitor_probe lacks a __initdata
annotation or the annotation of init_start_addr is wrong.

beta68 / linux

Section mismatch warnings - not only a warning #2