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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 18 Jun 2025, at 13:47, Matthew Wilcox wrote: > On Wed, Jun 18, 2025 at 08:42:17PM +0300, Dan Carpenter wrote: >> smatch warnings: >> mm/shmem.c:2223 shmem_split_large_entry() error: uninitialized symbol = 'entry_order'. > > ... > >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2169 if (!xa_is_value(old) |= | swp_to_radix_entry(swap) !=3D old) { >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2170 xas_set_err(&xas, -EEX= IST); >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2171 goto unlock; >> >> Imagine we hit this goto on the first iteration > > That can happen (but if it does, we set -EEXIST in the xa_state). > >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2213 unlock: >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2214 xas_unlock_irq(&xas); >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2215 >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2216 if (!xas_nomem(&xas, gf= p)) >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2217 break; >> >> And we hit this break. > > That's guaranteed. If there's an errno in the xa_state that isn't > -ENOMEM, xas_nomem() will fail. > >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2218 } >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2219 >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2220 if (xas_error(&xas)) >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2221 return xas_error(&xas);= >> 12885cbe88ddf6 Baolin Wang 2024-08-12 2222 >> d53c78fffe7ad3 Zi Yan 2025-03-14 @2223 return entry_order; > > but if this does happen, then xas_error() will be true and we'll return= > -EEXIST here instead of returning entry_order. Hi Matthew, Thank you for the explanation. Hi Dan, I got a similar report 3 months ago and explained it already. See https://lore.kernel.org/linux-mm/B024C29C-96D4-4F92-B2EF-F01CB06B27DF= @nvidia.com/ Best Regards, Yan, Zi