Received-SPF: pass (google.com: domain of linux-kernel+bounces-20438-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
Subject: Re: [PATCH] kexec: do syscore_shutdown() in kernel_kexec
Thread-Topic: [PATCH] kexec: do syscore_shutdown() in kernel_kexec
From: "Gowans, James" <jgowans@amazon.com>
To: "ebiederm@xmission.com" <ebiederm@xmission.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>
CC: "kexec@lists.infradead.org" <kexec@lists.infradead.org>, "maz@kernel.org"
	<maz@kernel.org>, "tony.luck@intel.com" <tony.luck@intel.com>,
	"sre@kernel.org" <sre@kernel.org>, "linux-kernel@vger.kernel.org"
	<linux-kernel@vger.kernel.org>, "seanjc@google.com" <seanjc@google.com>,
	"mingo@redhat.com" <mingo@redhat.com>, "pbonzini@redhat.com"
	<pbonzini@redhat.com>, "tglx@linutronix.de" <tglx@linutronix.de>,
	"arnd@arndb.de" <arnd@arndb.de>, "wens@csie.org" <wens@csie.org>, "Graf
 (AWS), Alexander" <graf@amazon.de>, =?utf-8?B?U2Now7ZuaGVyciwgSmFuIEgu?=
	<jschoenh@amazon.de>, "orsonzhai@gmail.com" <orsonzhai@gmail.com>,
	"bp@alien8.de" <bp@alien8.de>, "samuel@sholland.org" <samuel@sholland.org>,
	"pavel@ucw.cz" <pavel@ucw.cz>, "jernej.skrabec@gmail.com"
	<jernej.skrabec@gmail.com>
Thread-Index: AQHaLY9ODTyAGBa/a0igJR34RcFga7Cna2CZgAeYkYCAIjOQAA==
Date: Tue, 9 Jan 2024 06:59:35 +0000
Message-ID: <33a35d2c54b898ece210ead7d053db5c81e700f9.camel@amazon.com>
References: <20231213064004.2419447-1-jgowans@amazon.com>
	 <874jgm9huv.fsf@email.froward.int.ebiederm.org>
	 <5a0858597867948f271fa5676fb2e3361f35d920.camel@amazon.com>
In-Reply-To: <5a0858597867948f271fa5676fb2e3361f35d920.camel@amazon.com>
Accept-Language: en-ZA, en-US
Content-Language: en-US
Content-Type: text/plain; charset="utf-8"
Content-ID: <798B73416FE0AC429F2D086B523B02CA@amazon.com>
Content-Transfer-Encoding: base64
Precedence: bulk
MIME-Version: 1.0
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