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

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Message-ID: <59e8faec-05fd-805d-7de0-4b0508f8467f@huawei.com>
Date:   Mon, 30 May 2022 09:43:26 +0800
From:   "liaochang (A)" <liaochang1@...wei.com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Christophe Leroy <christophe.leroy@...roup.eu>
CC:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Li Zhengyu <lizhengyu3@...wei.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v2] kexec_file: Drop weak attribute from
 arch_kexec_apply_relocations[_add]

在 2022/5/29 22:06, Uwe Kleine-König 写道:
> 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

LGTM, you could send a fixup patch to riscv, thanks.

> 
> 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
> 
> 
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

-- 
BR,
Liao, Chang

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