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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Sep 2025 10:33:17.9195 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e7182aad-df78-4ead-4283-08ddf44348f1 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: DB5PEPF00014B89.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI0PR08MB11224 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250915_033328_583417_ED039E0D X-CRM114-Status: GOOD ( 15.31 ) 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 Hi Catalin, > On Sat, Aug 16, 2025 at 04:19:27PM +0100, Yeoreum Yun wrote: > > diff --git a/arch/arm64/include/asm/futex.h b/arch/arm64/include/asm/futex.h > > index bc06691d2062..ab7003cb4724 100644 > > --- a/arch/arm64/include/asm/futex.h > > +++ b/arch/arm64/include/asm/futex.h > > @@ -7,17 +7,21 @@ > > > > #include > > #include > > +#include > > > > #include > > > > -#define FUTEX_MAX_LOOPS 128 /* What's the largest number you can think of? */ > > +#define LLSC_MAX_LOOPS 128 /* What's the largest number you can think of? */ > > I just noticed - you might as well leave the name as is here, especially > if in patch 6 you align down address and use CAS on a 64-bit value as > per Will's comment (and it's no longer LLSC). I think renaming this is > unnecessary. Okay. I'll restore to use origin name. But I think LSUI wouldn't be used with CAS according to patch 6's comments from you and additionally i think chaning the CAS would make a failure because of change of unrelated field. i.e) struct user_structure{ uint32 futex; uint32 some_value; }; In this case, the change of some_value from user side could make a failure of futex atomic operation. So I think it would be better to keep the current LLSC implementation in LSUI. Thanks. -- Sincerely, Yeoreum Yun