linux-kernel - Re: [patch v12 05/13] task isolation: sync vmstats on return to userspace

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Date:   Wed, 27 Apr 2022 08:56:23 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Marcelo Tosatti <mtosatti@...hat.com>, linux-kernel@...r.kernel.org
Cc:     Nitesh Lal <nilal@...hat.com>,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alex Belits <abelits@...its.com>, Peter Xu <peterx@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Oscar Shiang <oscar0225@...email.tw>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [patch v12 05/13] task isolation: sync vmstats on return to
 userspace

On Tue, Mar 15 2022 at 12:31, Marcelo Tosatti wrote:
> --- linux-2.6.orig/kernel/entry/common.c
> +++ linux-2.6/kernel/entry/common.c
>  
> @@ -174,6 +175,9 @@ static unsigned long exit_to_user_mode_l
>  		if (ti_work & _TIF_NOTIFY_RESUME)
>  			tracehook_notify_resume(regs);
>  
> +		if (ti_work & _TIF_TASK_ISOL)
> +			task_isol_exit_to_user_mode();
> +
>  		/* Architecture specific TIF work */
>  		arch_exit_to_user_mode_work(regs, ti_work);

> --- linux-2.6.orig/include/linux/entry-common.h
> +++ linux-2.6/include/linux/entry-common.h
> @@ -60,7 +60,7 @@
>  #define EXIT_TO_USER_MODE_WORK						\
>  	(_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_UPROBE |		\
>  	 _TIF_NEED_RESCHED | _TIF_PATCH_PENDING | _TIF_NOTIFY_SIGNAL |	\
> -	 ARCH_EXIT_TO_USER_MODE_WORK)
> +	 _TIF_TASK_ISOL | ARCH_EXIT_TO_USER_MODE_WORK)

How is this supposed to compile when _TIF_TASK_ISOL is not defined by an
architecture?

Hint: Search for _TIF_PATCH_PENDING in the very same header file.

Thanks,

        tglx