From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Jann Horn <jannh@google.com>, Pedro Falcato <pfalcato@suse.de>,
Suren Baghdasaryan <surenb@google.com>,
Shakeel Butt <shakeel.butt@linux.dev>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
stable@vger.kernel.org
Subject: Re: [PATCH] fs/proc/task_mmu: fix missed VMAs when reading /proc/PID/maps and friends
Date: Mon, 26 Oct 2026 13:38:42 +0000 [thread overview]
Message-ID: <at9XoYEOWynH5skT@gremlin> (raw)
In-Reply-To: <at8-42OwXk2z6-HB@gremlin>
On Mon, Oct 26, 2026 at 01:35:23PM +0000, Lorenzo Stoakes (ARM) wrote:
> /* Returns true if mmap write unlocked. */
> static bool reset_walk_if_mmap_lock_dropped(struct vma_iterator *vmi,
> struct mm_struct *mm, unsigned long from_addr,
> unsigned int *last_seq)
> {
> if (vma_tree_maybe_changed(mm, *last_seq)) {
> /* Reset walk and re-speculate. */
> vma_iter_set(vmi, from_addr);
> return mmap_lock_speculate_try_begin(mm, last_seq);
> }
>
> return true;
> }
Actually, nicer as:
/* Returns true if mmap write unlocked. */
static bool reset_walk_if_mmap_lock_dropped(struct vma_iterator *vmi,
struct mm_struct *mm, unsigned long from_addr,
unsigned int *last_seq)
{
if (!vma_tree_maybe_changed(mm, *last_seq))
return true;
/* Reset walk and re-speculate. */
vma_iter_set(vmi, from_addr);
return mmap_lock_speculate_try_begin(mm, last_seq);
}
--
Cheers, Lorenzo
next prev parent reply other threads:[~2026-10-26 13:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-25 10:43 David Hildenbrand (Arm)
2026-10-25 14:55 ` Suren Baghdasaryan
2026-10-25 19:01 ` Jose A. Perez de Azpillaga
2026-10-26 10:04 ` David Hildenbrand (Arm)
2026-10-26 15:56 ` Andrew Morton
2026-10-26 13:35 ` Lorenzo Stoakes (ARM)
2026-10-26 13:38 ` Lorenzo Stoakes (ARM) [this message]
2026-10-26 16:16 ` Suren Baghdasaryan
2026-10-26 17:19 ` David Hildenbrand (Arm)
2026-10-26 17:26 ` Lorenzo Stoakes (ARM)
2026-10-26 18:01 ` Liam R. Howlett
2026-10-26 18:05 ` Lorenzo Stoakes (ARM)
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