linux-kernel - Re: [RFC PATCH 15/73] mm/vmalloc: Add a helper to reserve a contiguous and aligned kernel virtual area

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Date: Tue, 27 Feb 2024 06:56:24 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Lai Jiangshan <jiangshanlai@...il.com>
Cc: linux-kernel@...r.kernel.org, Hou Wenlong <houwenlong.hwl@...group.com>,
	Lai Jiangshan <jiangshan.ljs@...group.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
	kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
	x86@...nel.org, Kees Cook <keescook@...omium.org>,
	Juergen Gross <jgross@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org
Subject: Re: [RFC PATCH 15/73] mm/vmalloc: Add a helper to reserve a
 contiguous and aligned kernel virtual area

On Mon, Feb 26, 2024 at 10:35:32PM +0800, Lai Jiangshan wrote:
> From: Hou Wenlong <houwenlong.hwl@...group.com>
> 
> PVM needs to reserve a contiguous and aligned kernel virtual area for

Who is "PVM", and why does it need aligned virtual memory space?

> +extern struct vm_struct *get_vm_area_align(unsigned long size, unsigned long align,

No need for the extern here.