mm/page_alloc: fixes for free_pages_nolock() on RT/UP

[PATCH 0/2] mm/page_alloc: fixes for free_pages_nolock() on RT/UP

Posted by Brendan Jackman 1 week, 3 days ago

First patch was originally part of a different series but Andrew asked
for it to be separate:
https://lore.kernel.org/all/20260710170311.e22bfd21c658e8357ceddeec@linux-foundation.org/

Pre-existing bugs found by Sashiko during review of this other series:
https://lore.kernel.org/all/20260703-alloc-trylock-v5-0-c87b714e19d3@google.com/

I have not reproduced these bugs, and I suspect there is no real-world
user that is affected by them.

Signed-off-by: Brendan Jackman <jackmanb@google.com>
---
Brendan Jackman (2):
      mm/page_alloc: don't spin_trylock() in NMI on UP
      mm/page_alloc: don't spin_trylock() when disallowed in free_one_page()

 mm/page_alloc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
---
base-commit: 83c85fdab41ef98198bdbd731cebc9a15a185dcc
change-id: 20260714-alloc-nolock-fixes-e30618048b99

Best regards,
--  
Brendan Jackman <jackmanb@google.com>

Re: [PATCH 0/2] mm/page_alloc: fixes for free_pages_nolock() on RT/UP

Posted by Andrew Morton 1 week, 2 days ago

On Wed, 15 Jul 2026 09:03:57 +0000 Brendan Jackman <jackmanb@google.com> wrote:

> First patch was originally part of a different series but Andrew asked
> for it to be separate:
> https://lore.kernel.org/all/20260710170311.e22bfd21c658e8357ceddeec@linux-foundation.org/
> 
> Pre-existing bugs found by Sashiko during review of this other series:
> https://lore.kernel.org/all/20260703-alloc-trylock-v5-0-c87b714e19d3@google.com/
> 
> I have not reproduced these bugs, and I suspect there is no real-world
> user that is affected by them.

Right, thanks.  I'll stage these for the next merge window - no need to
rush these fixes into mainline.

And I staged them ahead of your "mm/page_alloc: rename FPI_TRYLOCK ->
FPI_NOLOCK", to lessen backporting hassles.