linux-kernel - Re: [PATCH v10 1/8] crash: introduce arch/*/asm/crash.h

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Message-ID: <YvCCOY+mRshu1tHi@MiWiFi-R3L-srv>
Date:   Mon, 8 Aug 2022 11:25:45 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Eric DeVolder <eric.devolder@...cle.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, ebiederm@...ssion.com,
        dyoung@...hat.com, vgoyal@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, nramas@...ux.microsoft.com, thomas.lendacky@....com,
        robh@...nel.org, efault@....de, rppt@...nel.org, david@...hat.com,
        sourabhjain@...ux.ibm.com, konrad.wilk@...cle.com,
        boris.ostrovsky@...cle.com
Subject: Re: [PATCH v10 1/8] crash: introduce arch/*/asm/crash.h

Hi Eric,

On 07/21/22 at 02:17pm, Eric DeVolder wrote:
> The use of __weak is being eliminated within kexec sources.
> The technique uses macros mapped onto inline functions in
> order to replace __weak.
> 
> This patchset was using __weak and so in order to replace
> __weak, this patch introduces arch/*/asm/crash.h, patterned
> after how kexec is moving away from __weak and to the macro
> definitions.

Are you going to replace __weak in kexec of arll ARCHes? I don't see
your point why all these empty header files are introduced. Wondering
what's impacted if not adding these empty files?

> 
> No functionality changed, yet.
> 
> Signed-off-by: Eric DeVolder <eric.devolder@...cle.com>
> ---
>  arch/arm/include/asm/crash.h     | 5 +++++
>  arch/arm64/include/asm/crash.h   | 5 +++++
>  arch/ia64/include/asm/crash.h    | 5 +++++
>  arch/m68k/include/asm/crash.h    | 5 +++++
>  arch/mips/include/asm/crash.h    | 5 +++++
>  arch/parisc/include/asm/crash.h  | 5 +++++
>  arch/powerpc/include/asm/crash.h | 5 +++++
>  arch/riscv/include/asm/crash.h   | 5 +++++
>  arch/s390/include/asm/crash.h    | 5 +++++
>  arch/sh/include/asm/crash.h      | 5 +++++
>  include/linux/crash_core.h       | 2 ++
>  11 files changed, 52 insertions(+)
>  create mode 100644 arch/arm/include/asm/crash.h
>  create mode 100644 arch/arm64/include/asm/crash.h
>  create mode 100644 arch/ia64/include/asm/crash.h
>  create mode 100644 arch/m68k/include/asm/crash.h
>  create mode 100644 arch/mips/include/asm/crash.h
>  create mode 100644 arch/parisc/include/asm/crash.h
>  create mode 100644 arch/powerpc/include/asm/crash.h
>  create mode 100644 arch/riscv/include/asm/crash.h
>  create mode 100644 arch/s390/include/asm/crash.h
>  create mode 100644 arch/sh/include/asm/crash.h
> 
> diff --git a/arch/arm/include/asm/crash.h b/arch/arm/include/asm/crash.h
> new file mode 100644
> index 000000000000..385646957d60
> --- /dev/null
> +++ b/arch/arm/include/asm/crash.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_ARM_CRASH_H
> +#define _ASM_ARM_CRASH_H
> +
> +#endif /* _ASM_ARM_CRASH_H */
> diff --git a/arch/arm64/include/asm/crash.h b/arch/arm64/include/asm/crash.h
> new file mode 100644
> index 000000000000..ec8870c1ea49
> --- /dev/null
> +++ b/arch/arm64/include/asm/crash.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_ARM64_CRASH_H
> +#define _ASM_ARM64_CRASH_H
> +
> +#endif /* _ASM_ARM64_CRASH_H */
> diff --git a/arch/ia64/include/asm/crash.h b/arch/ia64/include/asm/crash.h
> new file mode 100644
> index 000000000000..02a457cccda3
> --- /dev/null
> +++ b/arch/ia64/include/asm/crash.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_IA64_CRASH_H
> +#define _ASM_IA64_CRASH_H
> +
> +#endif /* _ASM_IA64_CRASH_H */
> diff --git a/arch/m68k/include/asm/crash.h b/arch/m68k/include/asm/crash.h
> new file mode 100644
> index 000000000000..ba6e412a1267
> --- /dev/null
> +++ b/arch/m68k/include/asm/crash.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_M68K_CRASH_H
> +#define _ASM_M68K_CRASH_H
> +
> +#endif /* _ASM_M68K_CRASH_H */
> diff --git a/arch/mips/include/asm/crash.h b/arch/mips/include/asm/crash.h
> new file mode 100644
> index 000000000000..35872522c574
> --- /dev/null
> +++ b/arch/mips/include/asm/crash.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_MIPS_CRASH_H
> +#define _ASM_MIPS_CRASH_H
> +
> +#endif /* _ASM_MIPS_CRASH_H */
> diff --git a/arch/parisc/include/asm/crash.h b/arch/parisc/include/asm/crash.h
> new file mode 100644
> index 000000000000..96833b727179
> --- /dev/null
> +++ b/arch/parisc/include/asm/crash.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_PARISC_CRASH_H
> +#define _ASM_PARISC_CRASH_H
> +
> +#endif /* _ASM_PARISC_CRASH_H */
> diff --git a/arch/powerpc/include/asm/crash.h b/arch/powerpc/include/asm/crash.h
> new file mode 100644
> index 000000000000..40ce71e56ac1
> --- /dev/null
> +++ b/arch/powerpc/include/asm/crash.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_POWERPC_CRASH_H
> +#define _ASM_POWERPC_CRASH_H
> +
> +#endif /* _ASM_POWERPC_CRASH_H */
> diff --git a/arch/riscv/include/asm/crash.h b/arch/riscv/include/asm/crash.h
> new file mode 100644
> index 000000000000..24f3aea99707
> --- /dev/null
> +++ b/arch/riscv/include/asm/crash.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_RISCV_CRASH_H
> +#define _ASM_RISCV_CRASH_H
> +
> +#endif /* _ASM_RISCV_CRASH_H */
> diff --git a/arch/s390/include/asm/crash.h b/arch/s390/include/asm/crash.h
> new file mode 100644
> index 000000000000..0db16ad4c75f
> --- /dev/null
> +++ b/arch/s390/include/asm/crash.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_S390_CRASH_H
> +#define _ASM_S390_CRASH_H
> +
> +#endif /* _ASM_S390_CRASH_H */
> diff --git a/arch/sh/include/asm/crash.h b/arch/sh/include/asm/crash.h
> new file mode 100644
> index 000000000000..f54e12f88cae
> --- /dev/null
> +++ b/arch/sh/include/asm/crash.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_SH_CRASH_H
> +#define _ASM_SH_CRASH_H
> +
> +#endif /* _ASM_SH_CRASH_H */
> diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
> index de62a722431e..cb0f1916fbf5 100644
> --- a/include/linux/crash_core.h
> +++ b/include/linux/crash_core.h
> @@ -6,6 +6,8 @@
>  #include <linux/elfcore.h>
>  #include <linux/elf.h>
>  
> +#include <asm/crash.h>
> +
>  #define CRASH_CORE_NOTE_NAME	   "CORE"
>  #define CRASH_CORE_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
>  #define CRASH_CORE_NOTE_NAME_BYTES ALIGN(sizeof(CRASH_CORE_NOTE_NAME), 4)
> -- 
> 2.31.1
>