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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jun 2025 10:29:11.7298 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f61324bd-2f08-4976-1fb7-08dda74079b5 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM3PEPF0000A79B.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAWPR08MB10058 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250609_032921_681561_4F217171 X-CRM114-Status: GOOD ( 15.18 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Look good to me. Reviewed-by: Yeoreum Yun > DEN0154 states that hardware will be allowed to ignore writes to TRB* > registers while the trace buffer is enabled. Add an ISB to ensure that > it's disabled before clearing the other registers. > > This is purely defensive because it's expected that arm_trbe_disable() > would be called before teardown which has the required ISB. > > Fixes: a2b579c41fe9 ("coresight: trbe: Remove redundant disable call") > Signed-off-by: James Clark > --- > drivers/hwtracing/coresight/coresight-trbe.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c > index 8267dd1a2130..10f3fb401edf 100644 > --- a/drivers/hwtracing/coresight/coresight-trbe.c > +++ b/drivers/hwtracing/coresight/coresight-trbe.c > @@ -257,6 +257,7 @@ static void trbe_drain_and_disable_local(struct trbe_cpudata *cpudata) > static void trbe_reset_local(struct trbe_cpudata *cpudata) > { > write_sysreg_s(0, SYS_TRBLIMITR_EL1); > + isb(); > trbe_drain_buffer(); > write_sysreg_s(0, SYS_TRBPTR_EL1); > write_sysreg_s(0, SYS_TRBBASER_EL1); > > --- > base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 > change-id: 20250609-james-cs-trblimitr-isb-523f20d874d6 > > Best regards, > -- > James Clark > > -- Sincerely, Yeoreum Yun