From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=82.195.75.108 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794395349; b=oDGJXT7NTX7PqHnJk20J5hWo/kiwihAvu/Zla124NfwUXgUly4tVHKFOzGSCe6GDb8iu 3MKQ2HdESdBP+OlQQ6tibDE8HnnaQ3hBrkpaGnuv4UdZgt7yRjuJbuLGsAlxcgVKema8n jPqMmO1Opw2shCT6IXMnA4s7/sJJI4O1X3IU+fjeohYJmhwXALKNM9yWO5oc0KDLMX3k+ I1vdIt10o7Y2uOnqSb4dJE1gE77Lwnfl7etXDx1xCKiVvPVmlkmNRzEoKOFiLANznNbyc OJQ7NOCM3KbIZDiAHIhlo5NtMyMw79pf6TQMwiYf4AaAj45rUWwCS2SNVGIvrWu2ytQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794395349; h=DMARC-Filter:DKIM-Signature:Received:Date:From:To:Cc:Subject: Message-ID:References:MIME-Version:Content-Type:Content-Disposition: In-Reply-To:X-Debian-User; bh=1E8ZwW2Eu8WYRG4t6PuIDQjLMNRBTfUw3ilSDjs1rRU=; b=j8bKmkN1th4G6EdENL/W6SksPWkN68GpyV7gd3YgY5KoOrFFxRBewYMnHoz+6EnEBHYq j24Waav80iL4EycnPqrjWGsSv4hR4RgrXKJyakGl+avupYsfqoriOAmw67CpcTZyOhQr5 djO6KZeZb8mwUv0t9Yk7mh2AKGvSYMP9a9YvTY3fu9ZII+wHav0PbVwyVj/gCfkBLx9AE g5TlSzZbBDWSpNvW2ERyMGcqC4cNMGncfjcjk1DGMaMZfDeJgO2GPflY2Wh4Xfs8rtZN7 gOT3rkuTZXosMMkRDzXoE1W7DbF+UOaUz2aCAuJh/N/nVgvBiBtZIyY0n2bwq8mwhqA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=debian.org; spf=pass smtp.mailfrom=debian.org; dkim=pass header.d=debian.org header.i=@debian.org header.a=rsa-sha256 header.s=smtpauto.stravinsky header.b=cmaAuP8N; arc=none smtp.remote-ip=82.195.75.108 Received: from stravinsky.debian.org (stravinsky.debian.org [82.195.75.108]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6FD11606A882; Wed, 11 Nov 2026 11:09:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 6FD11606A882 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=debian.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=debian.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=debian.org header.i=@debian.org header.a=rsa-sha256 header.s=smtpauto.stravinsky header.b=cmaAuP8N DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=debian.org; s=smtpauto.stravinsky; h=X-Debian-User:In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=1E8ZwW2Eu8WYRG4t6PuIDQjLMNRBTfUw3ilSDjs1rRU=; b=cmaAuP8N+P52iDtJVOwMGPU1Rm FqzHy98fPelH0mq8DY0owqaAxg/oEFesnLx84zScoPFheV2k7WVlrIMZiD+YqhJOtdi1Uad5BMK9F 6en5BPWw+v3fE+/rL0Y5CGl2nlw31TWn7YIv55D9SZjD1cX3jcE0XFY9dru8/P/fJ9kxPBYu19j9r dQCRq3bb5gxvXhKwVOCKpAVuCo/ZyutzCT/zkQXD2VE5qDpt5OROuRuNhBFVcpEfNi5ysabYpZyI6 NrlmK+fONZ1CyH6Ge32APS7qP0t5pyBN5b2pWN8ZWGxHWvL80WG44ipLS8WqhJtviyLV0r98zCRA3 +B8IoyiQ==; Received: from authenticated-user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from ) id 1xR6CD-00D8c2-2m; Wed, 11 Nov 2026 11:08:54 +0000 Date: Wed, 11 Nov 2026 03:08:48 -0800 From: Breno Leitao To: Chris Down Cc: Pasha Tatashin , Mike Rapoport , Pratyush Yadav , Alexander Graf , Baoquan He , Jonathan Corbet , Shuah Khan , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH 1/9] kho: Reclaim the metadata page left reserved after kexec Message-ID: References: <63ca64c004b296a998a3e531f8c0c4964916b70c.1794383544.git.chris@chrisdown.name> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <63ca64c004b296a998a3e531f8c0c4964916b70c.1794383544.git.chris@chrisdown.name> X-Debian-User: leitao On Tue, Nov 10, 2026 at 11:52:55PM -0800, Chris Down wrote: > After a KHO kexec, the new kernel keeps the page holding the previous > kernel's kexec metadata reserved for as long as it runs. It only needs > the page once, since kho_in_kexec_metadata() copies the previous release > and the kexec count out of it at boot, and nothing reads it again. Good catch. > > Free it with kho_restore_free() once copying is complete. > > Fixes: 76aa46b9e404 ("kho: kexec-metadata: track previous kernel chain") > Signed-off-by: Chris Down Tested-by: Breno Leitao