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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR04MB6575.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: f898a2e2-df7d-4513-5f78-08da058bf302 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Mar 2022 07:26:26.1646 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: zosicn0NT1C7wL900y05I1SZBcbJKuZXDAzK0cOj1BQLtBhaAwUZjydbUHis9fy3WseRvIdkk3m8MVdqkAwYlQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR04MB0708 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, > The mmc core enable cache on default. But it only enables cache-flushing > when host supports cmd23 and eMMC supports reliable write. > For hosts which do not support cmd23 or eMMCs which do not support > reliable write, the cache can not be flushed by `sync` command. > This may leads to cache data lost. > This patch enables cache-flushing as long as cache is enabled, no matter = host > supports cmd23 and/or eMMC supports reliable write or not. I looked in the spec and indeed couldn't find why enabling cache is depende= nt of cmd23/reliable write. Nor I was able to find the original commit log. Please allow few days to ask internally. Thanks, Avri