linux-kernel - Re: [PATCH v12 07/23] KVM: selftests: Add kbuild definitons

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Message-ID: <4a8c783a-e930-44ca-9222-ce6d8ce26463@linux.intel.com>
Date: Wed, 29 Oct 2025 15:43:46 +0800
From: Binbin Wu <binbin.wu@...ux.intel.com>
To: Sagi Shahar <sagis@...gle.com>
Cc: linux-kselftest@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
 Shuah Khan <shuah@...nel.org>, Sean Christopherson <seanjc@...gle.com>,
 Ackerley Tng <ackerleytng@...gle.com>, Ryan Afranji <afranji@...gle.com>,
 Andrew Jones <ajones@...tanamicro.com>,
 Isaku Yamahata <isaku.yamahata@...el.com>,
 Erdem Aktas <erdemaktas@...gle.com>,
 Rick Edgecombe <rick.p.edgecombe@...el.com>,
 Roger Wang <runanwang@...gle.com>, Oliver Upton <oliver.upton@...ux.dev>,
 "Pratik R. Sampat" <pratikrajesh.sampat@....com>,
 Reinette Chatre <reinette.chatre@...el.com>, Ira Weiny
 <ira.weiny@...el.com>, Chao Gao <chao.gao@...el.com>,
 Chenyi Qiang <chenyi.qiang@...el.com>, linux-kernel@...r.kernel.org,
 kvm@...r.kernel.org
Subject: Re: [PATCH v12 07/23] KVM: selftests: Add kbuild definitons

On 10/29/2025 5:20 AM, Sagi Shahar wrote:
> Add kbuild.h that can be used by files under tools/
>
> Definitions are taken from the original definitions at
> include/linux/kbuild.h
>
> This is needed to expose values from c code to assembly code.
>
> Signed-off-by: Sagi Shahar <sagis@...gle.com>
> ---
>   tools/include/linux/kbuild.h | 18 ++++++++++++++++++
>   1 file changed, 18 insertions(+)
>   create mode 100644 tools/include/linux/kbuild.h
>
> diff --git a/tools/include/linux/kbuild.h b/tools/include/linux/kbuild.h
> new file mode 100644
> index 000000000000..62e20ba9380e
> --- /dev/null
> +++ b/tools/include/linux/kbuild.h
> @@ -0,0 +1,18 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __TOOLS_LINUX_KBUILD_H
> +#define __TOOLS_LINUX_KBUILD_H
> +
> +#include <stddef.h>

This is not in kernel's version.
Instead, consumers of kbuild.h include the necessary header.

Maybe it can follow kernel's style?

> +
> +#define DEFINE(sym, val) \
> +	asm volatile("\n.ascii \"->" #sym " %0 " #val "\"" : : "i" (val))
> +
> +#define BLANK() asm volatile("\n.ascii \"->\"" : : )
> +
> +#define OFFSET(sym, str, mem) \
> +	DEFINE(sym, offsetof(struct str, mem))
> +
> +#define COMMENT(x) \
> +	asm volatile("\n.ascii \"->#" x "\"")
> +
> +#endif /* __TOOLS_LINUX_KBUILD_H */