linux-kernel - Re: [PATCH v2 5/9] mm: Initialize struct vm_unmapped_area

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Date: Wed, 28 Feb 2024 13:51:42 +0200
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc: Liam.Howlett@...cle.com, akpm@...ux-foundation.org, debug@...osinc.com, 
	broonie@...nel.org, keescook@...omium.org, tglx@...utronix.de, mingo@...hat.com, 
	bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org, luto@...nel.org, 
	peterz@...radead.org, hpa@...or.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	linux-alpha@...r.kernel.org, linux-snps-arc@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org, loongarch@...ts.linux.dev, 
	linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, 
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH v2 5/9] mm: Initialize struct vm_unmapped_area_info

On Mon, Feb 26, 2024 at 11:09:47AM -0800, Rick Edgecombe wrote:
> diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
> index 5db88b627439..dd6801bb9240 100644
> --- a/arch/alpha/kernel/osf_sys.c
> +++ b/arch/alpha/kernel/osf_sys.c
> @@ -1218,7 +1218,7 @@ static unsigned long
>  arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
>  		         unsigned long limit)
>  {
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>  
>  	info.flags = 0;
>  	info.length = len;

Can we make a step forward and actually move initialization inside the
initializator? Something like below.

I understand that it is substantially more work, but I think it is useful.

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 5db88b627439..c40ddede3b13 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -1218,14 +1218,12 @@ static unsigned long
 arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
 		         unsigned long limit)
 {
-	struct vm_unmapped_area_info info;
+	struct vm_unmapped_area_info info = {
+		.length = len;
+		.low_limit = addr,
+		.high_limit = limit,
+	};

-	info.flags = 0;
-	info.length = len;
-	info.low_limit = addr;
-	info.high_limit = limit;
-	info.align_mask = 0;
-	info.align_offset = 0;
 	return vm_unmapped_area(&info);
 }

-- 
  Kiryl Shutsemau / Kirill A. Shutemov