linux-kernel - Re: [PATCH v1] mm: abstract shadow stack vma behind arch_is_shadow_stack

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Date: Tue, 2 Jan 2024 17:50:06 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "broonie@...nel.org" <broonie@...nel.org>, "debug@...osinc.com"
	<debug@...osinc.com>
CC: "linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "akpm@...ux-foundation.org"
	<akpm@...ux-foundation.org>
Subject: Re: [PATCH v1] mm: abstract shadow stack vma behind
 arch_is_shadow_stack_vma

On Fri, 2023-12-22 at 15:51 -0800, Deepak Gupta wrote:
> +
> +static inline bool arch_is_shadow_stack_vma(vm_flags_t vm_flags)
> +{
> +       return (vm_flags & VM_SHADOW_STACK) ? true : false;
> +}
> +

The bit after the "?" should be unneeded. I would think that patterns
like:

   bool res = val ? true : false;

...should never be needed for the kernel's current bool typedef. Is
there some special arch define consideration or something, I'm unaware
of?

https://www.kernel.org/doc/html/latest/process/coding-style.html#using-bool