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Michael Ellerman authored
We currently have two section mismatch warnings: The function __boot_from_prom() references the function __init prom_init(). The function start_here_common() references the function __init start_kernel(). The warnings are correct, we do have branches from non-init code into init code, which is freed after boot. But we don't expect to ever execute any of that early boot code after boot, if we did that would be a bug. In particular calling into OF after boot would be fatal because OF is no longer resident. So for now fix the warnings by marking the relevant functions as __REF, which puts them in the ".ref.text" section. This causes some reordering of the functions in the final link: @@ -217,10 +217,9 @@ c00000000000b088 t generic_secondary_common_init c00000000000b124 t __mmu_off c00000000000b14c t __start_initialization_multiplatform -c00000000000b1ac t __boot_from_prom -c00000000000b1ec t __after_prom_start -c00000000000b260 t p_end -c00000000000b27c T copy_and_flush +c00000000000b1ac t __after_prom_start +c00000000000b220 t p_end +c00000000000b23c T copy_and_flush c00000000000b300 T __secondary_start c00000000000b300 t copy_to_here c00000000000b344 t start_secondary_prolog @@ -228,8 +227,9 @@ c00000000000b36c t enable_64b_mode c00000000000b388 T relative_toc c00000000000b3a8 t p_toc -c00000000000b3b0 t start_here_common -c00000000000b3d0 t start_here_multiplatform +c00000000000b3b0 t __boot_from_prom +c00000000000b3f0 t start_here_multiplatform +c00000000000b480 t start_here_common c00000000000b880 T system_call_common c00000000000b974 t system_call c00000000000b9dc t system_call_exit In particular __boot_from_prom moves after copy_to_here, which means it's not copied to zero in the first stage of copy of the kernel to zero. But that's OK, because we only call __boot_from_prom before we do the copy, so it makes no difference when it's copied. The call sequence is: __start -> __start_initialization_multiplatform -> __boot_from_prom -> __start -> __start_initialization_multiplatform -> __after_prom_start -> copy_and_flush -> copy_and_flush (relocated to 0) -> start_here_multiplatform -> early_setup Reported-by: Mauricio Faria de Oliveira <mauricfo@linux.ibm.com> Reported-by: Roman Bolshakov <r.bolshakov@yadro.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200225031328.14676-1-mpe@ellerman.id.au
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