From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Michael Ellerman <mpe@ellerman.id.au>, linuxppc-dev@ozlabs.org
Cc: aneesh.kumar@linux.vnet.ibm.com, npiggin@gmail.com, anton@samba.org
Subject: Re: powerpc/mm/radix: Drop support for CPUs without lockless tlbie
Date: Thu, 4 May 2017 08:19:03 +1000 (AEST) [thread overview]
Message-ID: <3wJCHW665Wz9s03@ozlabs.org> (raw)
In-Reply-To: <1493786699-14850-1-git-send-email-mpe@ellerman.id.au>
On Wed, 2017-05-03 at 04:44:59 UTC, Michael Ellerman wrote:
> Currently the radix TLB code includes support for CPUs that do *not*
> have MMU_FTR_LOCKLESS_TLBIE. On those CPUs we are required to take a
> global spinlock before issuing a tlbie.
>
> Radix can only be built for 64-bit Book3s CPUs, and of those, only
> POWER4, 970, Cell and PA6T do not have MMU_FTR_LOCKLESS_TLBIE. Although
> it's possible to build a kernel with Radix support that can also boot on
> those CPUs, we happen to know that in reality none of those CPUs support
> the Radix MMU, so the code can never actually run on those CPUs.
>
> So remove the native_tlbie_lock in the Radix TLB code.
>
> Note that there is another lock of the same name in the hash code, which
> is unaffected by this patch.
>
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
> Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Applied to powerpc next.
https://git.kernel.org/powerpc/c/3c9ac2bcc35453141f82461c71ed10
cheers
prev parent reply other threads:[~2017-05-03 22:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-03 4:44 [PATCH] powerpc/mm/radix: Drop support for CPUs without lockless tlbie Michael Ellerman
2017-05-03 5:36 ` Nicholas Piggin
2017-05-03 22:19 ` Michael Ellerman [this message]
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