From: Peter Zijlstra <peterz@infradead.org>
To: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>,
linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Andy Lutomirski <luto@kernel.org>
Subject: Re: [PATCH 1/2] entry: Rename arch_check_user_regs() to arch_enter_from_user_mode()
Date: Mon, 9 May 2022 09:08:31 +0200 [thread overview]
Message-ID: <20220509070831.GD76023@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <yt9dsfpjgrba.fsf@linux.ibm.com>
On Mon, May 09, 2022 at 08:20:41AM +0200, Sven Schnelle wrote:
> Peter Zijlstra <peterz@infradead.org> writes:
>
> > On Wed, May 04, 2022 at 08:23:50AM +0200, Thomas Richter wrote:
> >> From: Sven Schnelle <svens@linux.ibm.com>
> >>
> >> arch_check_user_regs() is used at the moment to verify that struct pt_regs
> >> contains valid values when entering the kernel from userspace. s390 needs
> >> a place in the generic entry code to modify a cpu data structure when
> >> switching from userspace to kernel mode. As arch_check_user_regs() is
> >> exactly this, rename it to arch_enter_from_user_mode().
> >>
> >> Cc: Thomas Gleixner <tglx@linutronix.de>
> >> Cc: Peter Zijlstra <peterz@infradead.org>
> >> Cc: Andy Lutomirski <luto@kernel.org>
> >> Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
> >> ---
> >
> > With the note that NMI doesn't (necessarily) call this..
> >
> > Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
>
> How about:
>
> "When entering the kernel from userspace, arch_check_user_regs() is
> used to verify that struct pt_regs contains valid values. Note that
> the NMI codepath doesn't call this function. s390 needs a place in the
> generic entry code to modify a cpu data structure when switching from
> userspace to kernel mode. As arch_check_user_regs() is exactly this,
> rename it to arch_enter_from_user_mode()."
Sure, thanks!
next prev parent reply other threads:[~2022-05-09 7:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-04 6:23 [PATCH 0/2] s390/pai: Add support for Processor Activity Instrumentation Thomas Richter
2022-05-04 6:23 ` [PATCH 1/2] entry: Rename arch_check_user_regs() to arch_enter_from_user_mode() Thomas Richter
2022-05-06 19:31 ` Peter Zijlstra
2022-05-09 6:20 ` Sven Schnelle
2022-05-09 7:08 ` Peter Zijlstra [this message]
2022-05-09 9:55 ` Heiko Carstens
2022-05-06 19:38 ` Thomas Gleixner
2022-05-06 19:49 ` Heiko Carstens
2022-05-06 21:55 ` Thomas Gleixner
2022-05-04 6:23 ` [PATCH 2/2] s390/pai: Add support for cryptography counters Thomas Richter
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