From: Dave Hansen <dave.hansen@intel.com>
To: Peter Zijlstra <peterz@infradead.org>,
"Mike Rapoport (Microsoft)" <rppt@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@alien8.de>,
David CARLIER <devnexen@gmail.com>,
David Hildenbrand <david@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Jason Gunthorpe <jgg@ziepe.ca>,
Juergen Gross <jgross@suse.com>,
Kevin Tian <kevin.tian@intel.com>,
Kiryl Shutsemau <kas@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Lorenzo Stoakes <ljs@kernel.org>,
Lu Baolu <baolu.lu@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Shakeel Butt <shakeel.butt@linux.dev>,
Suren Baghdasaryan <surenb@google.com>,
Thomas Gleixner <tglx@kernel.org>,
Toshi Kani <toshi.kani@hpe.com>,
Vishal Moola <vishal.moola@gmail.com>,
Vlastimil Babka <vbabka@kernel.org>,
Will Deacon <will@kernel.org>,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, stable@vger.kernel.org, x86@kernel.org
Subject: Re: [PATCH 1/5] x86/mm/pat: introcude cpa_lock() and cpa_unlock()
Date: Tue, 28 Jul 2026 07:30:27 -0700 [thread overview]
Message-ID: <adfffb36-9943-4af7-a0ee-0e762e47fa11@intel.com> (raw)
In-Reply-To: <20260728142108.GW751831@noisy.programming.kicks-ass.net>
On 7/28/26 07:21, Peter Zijlstra wrote:
> There was already a patch merged that removed the shole debug_pagealloc
> exception. Is that not better?
As I'm scanning through email this morning, there's another issue that
popped up with that patch. It's causing hangs on boot.
It's looking like debug pagealloc not taking the lock is actually
functional, not an optimization. Although, I hesitate to say
"functional" and would prefer to use much less nice words to describe it.
next prev parent reply other threads:[~2026-07-28 14:30 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-28 13:07 [PATCH 0/5] x86/mm/pat: CPA fixes Mike Rapoport (Microsoft)
2026-07-28 13:07 ` [PATCH 1/5] x86/mm/pat: introcude cpa_lock() and cpa_unlock() Mike Rapoport (Microsoft)
2026-07-28 13:13 ` Lorenzo Stoakes (ARM)
2026-07-28 14:21 ` Peter Zijlstra
2026-07-28 14:30 ` Dave Hansen [this message]
2026-07-28 14:31 ` Peter Zijlstra
2026-07-28 14:46 ` Mike Rapoport
2026-07-28 14:50 ` Lorenzo Stoakes (ARM)
2026-07-28 14:55 ` Peter Zijlstra
2026-07-28 15:01 ` Peter Zijlstra
2026-07-28 15:20 ` Lorenzo Stoakes (ARM)
2026-07-28 15:33 ` Peter Zijlstra
2026-07-28 15:54 ` Mike Rapoport
2026-07-28 15:02 ` Lorenzo Stoakes (ARM)
2026-07-28 15:30 ` Peter Zijlstra
2026-07-28 15:16 ` Peter Zijlstra
2026-07-28 16:01 ` Mike Rapoport
2026-07-28 13:07 ` [PATCH 2/5] x86/mm/pat: acquire init_mm write lock on collapse to avoid UAF Mike Rapoport
2026-07-28 13:07 ` [PATCH 3/5] x86/mm/pat: acquire init_mm read lock on attribute change " Mike Rapoport
2026-07-28 13:14 ` Lorenzo Stoakes (ARM)
2026-07-28 13:07 ` [PATCH 4/5] x86/mm/pat: allocate split page tables as kernel page tables Mike Rapoport
2026-07-28 13:07 ` [PATCH 5/5] x86/mm/pat: fix effective RW computation in lookup_address_in_pgd_attr() Mike Rapoport (Microsoft)
2026-07-28 13:11 ` [PATCH 0/5] x86/mm/pat: CPA fixes Lorenzo Stoakes (ARM)
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