linux-kernel - Re: [PATCH v3 07/11] x86/mm: Stop calling leave

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Date:   Fri, 23 Jun 2017 11:07:47 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Nadav Amit <nadav.amit@...il.com>,
        Rik van Riel <riel@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 07/11] x86/mm: Stop calling leave_mm() in idle code

On Tue, Jun 20, 2017 at 10:22:13PM -0700, Andy Lutomirski wrote:
> Now that lazy TLB suppresses all flush IPIs (as opposed to all but
> the first), there's no need to leave_mm() when going idle.
> 
> This means we can get rid of the rcuidle hack in
> switch_mm_irqs_off() and we can unexport leave_mm().
> 
> This also removes acpi_unlazy_tlb() from the x86 and ia64 headers,
> since it has no callers any more.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
>  arch/ia64/include/asm/acpi.h  |  2 --
>  arch/x86/include/asm/acpi.h   |  2 --
>  arch/x86/mm/tlb.c             | 19 +++----------------
>  drivers/acpi/processor_idle.c |  2 --
>  drivers/idle/intel_idle.c     |  9 ++++-----
>  5 files changed, 7 insertions(+), 27 deletions(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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