Re: [PATCH] parisc: Remove lock code to serialize TLB operations in pacache.S

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On 2019-04-17 4:58 p.m., Helge Deller wrote:
> On 17.04.19 22:55, Sven Schnelle wrote:
>> On Fri, Apr 12, 2019 at 07:12:04PM -0400, John David Anglin wrote:
>>> TLB operations only need to be serialized on machines with the Merced (Stretch) bus.
>>> The only machines in this category are L and N class, and they require a 64-bit PA 2.0
>>> kernel.  On these machines, we use local TLB purges in the tmpalias routines.  We don't
>>> need to serialize TLB purges on all other machines.  Thus, the lock/unlock code can be
>>> removed when CONFIG_PA20 is not defined.  Further, when CONFIG_PA20 is not defined,
>>> alternative patching converts the TLB purges to local purges when PA 2.0 hardware has
>>> been detected.
>>>
>>> Signed-off-by: John David Anglin <dave.anglin@xxxxxxxx>
>> I had this patch running on my C8000 and J5000 for a few days, and haven't
>> encountered any issues.
> Nah...
> I do have one of the critical machines (rp5470), and I tried
> to add the necessary code to detect and handle the TLB serialization.
> Until now the patch sadly doesn't work yet (hangs at boot), it still needs more work.
> You can find it in my git tree:
> https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/commit/?h=tlb-flush-merced-bus&id=fc6044f83cb9828ec6ebecb23a46549d9ebc518f
I don't see it...

Dave

-- 
John David Anglin  dave.anglin@xxxxxxxx




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