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Fri, 06 Mar 2026 12:25:41 -0800 (PST) Date: Fri, 6 Mar 2026 20:25:42 +0000 From: Josh Law To: Matthew Wilcox Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Josh Law , Yi Liu , Jason Gunthorpe Message-ID: <64ea7b4d-1d55-4d9e-8fef-396613e8bc10@gmail.com> In-Reply-To: References: <20260306200319.2819286-1-objecting@objecting.org> Subject: Re: [PATCH] lib/idr: fix ida_find_first_range() missing IDs across chunk boundaries MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Correlation-ID: <64ea7b4d-1d55-4d9e-8fef-396613e8bc10@gmail.com> X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 28DE240004 X-Stat-Signature: tx6puwnrnxw38wrnmneybysgy6cej3wc X-Rspam-User: X-HE-Tag: 1772828743-721141 X-HE-Meta: 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 jHOCJzfu 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 6 Mar 2026 20:15:29 Matthew Wilcox : > On Fri, Mar 06, 2026 at 08:03:19PM +0000, Josh Law wrote: >> ida_find_first_range() only examines the first XArray entry returned by >> xa_find(). If that entry does not contain a set bit at or above the >> requested offset, the function returns -ENOENT without searching >> subsequent entries, even though later chunks may contain allocated IDs >> within the requested range. > > Can I trouble you to add a test to lib/test_ida.c to demonstrate the > problem (and that it's fixed, and that it doesn't come back)? > > Also this needs a Fixes: line.=C2=A0 I suggest 7fe6b987166b is the commit > it's fixing.=C2=A0 Add Jason and Yi Liu as well as the author and committ= er > of that patch. Okay, you mind if I put the modifications to test_ida.c on the same commit?= Or would you like it on another commit V/R Josh law