linux-kernel - Re: [PATCH RFC v2 2/4] mm: Add hint and mmap_flags to struct vm_unmapped_area

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Message-ID: <0454187e-3e01-4af7-b193-07468ffa8934@lucifer.local>
Date: Thu, 29 Aug 2024 09:48:44 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Charlie Jenkins <charlie@...osinc.com>
Cc: Arnd Bergmann <arnd@...db.de>,
        Richard Henderson <richard.henderson@...aro.org>,
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Subject: Re: [PATCH RFC v2 2/4] mm: Add hint and mmap_flags to struct
 vm_unmapped_area_info

On Thu, Aug 29, 2024 at 12:15:59AM GMT, Charlie Jenkins wrote:

[snip]

> diff --git a/mm/mmap.c b/mm/mmap.c
> index d0dfc85b209b..34ba0db23678 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -1796,6 +1796,9 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr,
>  	struct vm_unmapped_area_info info = {};
>  	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
>
> +	info.hint = addr;
> +	info.mmap_flags = flags;
> +
>  	if (len > mmap_end - mmap_min_addr)
>  		return -ENOMEM;
>
> @@ -1841,6 +1844,9 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
>  	struct vm_unmapped_area_info info = {};
>  	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
>
> +	info.hint = addr;
> +	info.mmap_flags = flags;
> +
>  	/* requested length too big for entire address space */
>  	if (len > mmap_end - mmap_min_addr)
>  		return -ENOMEM;
>

These line numbers suggest you're working against Linus's tree, mm/mmap.c
has changed a lot recently, so to avoid conflicts please base your changes
on mm-unstable in Andrew's tree (if looking to go through that) or at least
-next.

> --
> 2.45.0
>