Re: [PATCH v2] kexec_file: Drop weak attribute from arch_kexec_apply_relocations[_add]

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

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Hello,

On Sun, May 29, 2022 at 09:46:47AM +0000, Christophe Leroy wrote:
> Le 29/05/2022 à 08:56, Uwe Kleine-König a écrit :
> > Hello,
> > 
> > on current linux-next ARCH=riscv allmodconfig breaks with:
> > 
> >    CC      arch/riscv/kernel/elf_kexec.o
> > arch/riscv/kernel/elf_kexec.c:345:5: error: redefinition of ‘arch_kexec_apply_relocations_add’
> >    345 | int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
> >        |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > In file included from arch/riscv/kernel/elf_kexec.c:16:
> > include/linux/kexec.h:236:1: note: previous definition of ‘arch_kexec_apply_relocations_add’ with type ‘int(struct purgatory_info *, Elf64_Shdr *, const Elf64_Shdr *, const Elf64_Shdr *)’ {aka ‘int(struct purgatory_info *, struct elf64_shdr *, const struct elf64_shdr *, const struct elf64_shdr *)’}
> >    236 | arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section,
> >        | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > 
> > (I think) because there is a conflict between the two commits:
> > 
> > 233c1e6c319c kexec_file: drop weak attribute from arch_kexec_apply_relocations[_add]
> > 838b3e28488f RISC-V: Load purgatory in kexec_file
> > 
> > And so next is broken starting from
> > 164a9037b1d33f28ba27671c16ec1c23d4a11acf which merges the riscv tree.
> > 
> 
> In arch/riscv/include/asm/kexec.h, do the same as s390 did in commit 
> 233c1e6c319c:
> 
> diff --git a/arch/s390/include/asm/kexec.h b/arch/s390/include/asm/kexec.h
> index 7f3c9ac34bd8..540dd469b088 100644
> --- a/arch/s390/include/asm/kexec.h
> +++ b/arch/s390/include/asm/kexec.h
> @@ -83,4 +83,12 @@ struct kimage_arch {
>   extern const struct kexec_file_ops s390_kexec_image_ops;
>   extern const struct kexec_file_ops s390_kexec_elf_ops;
> 
> +#ifdef CONFIG_KEXEC_FILE
> +struct purgatory_info;
> +int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
> +				     Elf_Shdr *section,
> +				     const Elf_Shdr *relsec,
> +				     const Elf_Shdr *symtab);
> +#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add
> +#endif
>   #endif /*_S390_KEXEC_H */

I can confirm that doing

diff --git a/arch/riscv/include/asm/kexec.h b/arch/riscv/include/asm/kexec.h
index 206217b23301..eee260e8ab30 100644
--- a/arch/riscv/include/asm/kexec.h
+++ b/arch/riscv/include/asm/kexec.h
@@ -55,6 +55,13 @@ extern riscv_kexec_method riscv_kexec_norelocate;
 
 #ifdef CONFIG_KEXEC_FILE
 extern const struct kexec_file_ops elf_kexec_ops;
+
+struct purgatory_info;
+int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
+				     Elf_Shdr *section,
+				     const Elf_Shdr *relsec,
+				     const Elf_Shdr *symtab);
+#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add
 #endif
 
 #endif

on top of 838b3e28488f results in a compilable tree. And when merging
233c1e6c319c into this, it is still building.

I'm not enough into kexec (and riscv) to judge if this is sensible, or
create a useful commit log but the obvious way forward is to apply the
above patch to the riscv tree before it hits Linus' tree.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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