lkml.org 
[lkml]   [2023]   [Jun]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH AUTOSEL 6.3 06/11] of: fdt: Scan /memreserve/ last
On Mon, May 15, 2023 at 09:21:04PM +0100, Conor Dooley wrote:
>Hey Sasha,
>
>On Thu, May 11, 2023 at 03:37:49PM -0400, Sasha Levin wrote:
>> From: Lucas Tanure <tanure@linux.com>
>>
>> [ Upstream commit b413281876292de44ae84e9a9ce9d62e47f266e9 ]
>>
>> Change the scanning /memreserve/ and /reserved-memory node order to fix
>> Kernel panic on Khadas Vim3 Board.
>>
>> If /memreserve/ goes first, the memory is reserved, but nomap can't be
>> applied to the region. So the memory won't be used by Linux, but it is
>> still present in the linear map as normal memory, which allows
>> speculation. Legitimate access to adjacent pages will cause the CPU
>> to end up prefetching into them leading to Kernel panic.
>>
>> So /reserved-memory node should go first, as it has a more updated
>> description of the memory regions and can apply flags, like nomap.
>>
>> Link: https://lore.kernel.org/all/CAJX_Q+1Tjc+-TjZ6JW9X0NxEdFe=82a9626yL63j7uVD4LpxEA@mail.gmail.com/
>> Signed-off-by: Lucas Tanure <tanure@linux.com>
>> Link: https://lore.kernel.org/r/20230424113846.46382-1-tanure@linux.com
>> Signed-off-by: Rob Herring <robh@kernel.org>
>> Signed-off-by: Sasha Levin <sashal@kernel.org>
>
>Rob requested that this patch (and it's bretheren in other AUTOSEL
>series) not be backported immediately:
>| Going to let this sit in linux-next for a bit. I also didn't tag for
>| stable kernels. I want it to get some exposure in mainline at least for
>| a few -rc releases rather than getting backported right away. Please
>| help ensure that happens if you see stable review emails. I'm going to
>| be offline most of the next month.
>https://lore.kernel.org/linux-devicetree/168262872454.3491083.6407810340850053636.robh@kernel.org/
>
>Perhaps delaying it for another couple of weeks, since we have only just
>had -rc2, is a good idead?

I'll drop it, let me know when you want it included back. Thanks!

--
Thanks,
Sasha

\
 
 \ /
  Last update: 2023-06-01 11:56    [W:0.070 / U:0.212 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site