linux-kernel - Re: [PATCH 1/4] mm: declare VMA flags by bit

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Message-ID: <aQTAejgLn8_Er8RF@gourry-fedora-PF4VCD3F>
Date: Fri, 31 Oct 2025 09:58:18 -0400
From: Gregory Price <gourry@...rry.net>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Muchun Song <muchun.song@...ux.dev>,
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Subject: Re: [PATCH 1/4] mm: declare VMA flags by bit

On Wed, Oct 29, 2025 at 05:49:35PM +0000, Lorenzo Stoakes wrote:
> 
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index db16ed91c269..c113a3eb5cbd 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -1182,10 +1182,10 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
>  		[ilog2(VM_PKEY_BIT0)]	= "",
>  		[ilog2(VM_PKEY_BIT1)]	= "",
>  		[ilog2(VM_PKEY_BIT2)]	= "",
> -#if VM_PKEY_BIT3
> +#if CONFIG_ARCH_PKEY_BITS > 3
>  		[ilog2(VM_PKEY_BIT3)]	= "",
>  #endif
> -#if VM_PKEY_BIT4
> +#if CONFIG_ARCH_PKEY_BITS > 4
>  		[ilog2(VM_PKEY_BIT4)]	= "",
>  #endif
>  #endif /* CONFIG_ARCH_HAS_PKEYS */


I realize this causes some annoying churn, but is it possible/reasonable
to break the no-op ifdefsphagetti fixes into a separate diff?

it makes it easier to see this change:

> -# define VM_PKEY_BIT0  VM_HIGH_ARCH_0
> +#define VM_PKEY_BIT0 VMA_BIT(VMA_PKEY_BIT0_BIT)

~Gregory