linux-kernel - Re: [PATCH v1 05/11] mm: convert VM_PFNMAP tracking to pfnmap_track() + pfnmap

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Message-ID: <6fa60c1d-ccbe-4bf4-a572-39711ac379ee@redhat.com>
Date: Wed, 7 May 2025 15:25:42 +0200
From: David Hildenbrand <david@...hat.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
 intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-trace-kernel@...r.kernel.org, Dave Hansen
 <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 "H. Peter Anvin" <hpa@...or.com>, Jani Nikula <jani.nikula@...ux.intel.com>,
 Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>, Tvrtko Ursulin
 <tursulin@...ulin.net>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Andrew Morton <akpm@...ux-foundation.org>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
 Pedro Falcato <pfalcato@...e.de>, Peter Xu <peterx@...hat.com>,
 Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [PATCH v1 05/11] mm: convert VM_PFNMAP tracking to pfnmap_track()
 + pfnmap_untrack()

>>
>> Obviously my series will break this but should be _fairly_ trivial to
>> update.
>>
>> You will however have to make sure to update tools/testing/vma/* to handle
>> the new functions in userland testing (they need to be stubbed otu).

Hmm, seems to compile. I guess, because we won't have
"__HAVE_PFNMAP_TRACKING" defined in the test environment, so
the existing stubs in there already seem to do the trick.


+#else
+static inline int vma_pfnmap_track_ctx_dup(struct vm_area_struct *orig,
+              struct vm_area_struct *new)
+{
+      return 0;
  }
+static inline void vma_pfnmap_track_ctx_release(struct vm_area_struct *vma)
+{
+}
+#endif


-- 
Cheers,

David / dhildenb