linux-kernel - Re: [RFC PATCH 2/8] thread_info: allow custom in-task thread

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Message-ID: <CALCETrWni0aZ71r-R6oYG98kZvZA8a184UR0YURk_=tXu8HXMw@mail.gmail.com>
Date:   Thu, 15 Sep 2016 11:37:47 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Mark Rutland <mark.rutland@....com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>, james.morse@....com,
        Kees Cook <keescook@...omium.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        lorenzo.pieralisi@....com, Andrew Lutomirski <luto@...nel.org>,
        suzuki.poulose@....com,
        Takahiro Akashi <takahiro.akashi@...aro.org>,
        Will Deacon <will.deacon@....com>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [RFC PATCH 2/8] thread_info: allow custom in-task thread_info

On Thu, Sep 15, 2016 at 6:49 AM, Mark Rutland <mark.rutland@....com> wrote:
> Currently, task_struct is defined in <linux/sched.h>, which (indirectly)
> pulls in a number of low-level arch headers such as <asm/preempt.h>
> through a number of other headers. Thus, code and structures in these
> headers can't rely on the definition of task_struct. Some of these
> headers are necessary for the definition of task_struct, so moving
> task_struct into its own header is insufficient tio avoid circular
> includes.

The flippant answer is to fix the headers, but I tried that myself and
gave up :(

But how about this slightly less duplicative alternative:

struct thread_info {
#ifdef arch_thread_info
  struct arch_thread_info arch_ti;
#endif
};