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McKenney" , Boqun Feng , Paolo Bonzini , Sean Christopherson , Wei Liu , Dexuan Cui , Arnd Bergmann , Heiko Carstens , Christian Borntraeger , Sven Schnelle , Huacai Chen , Paul Walmsley , Palmer Dabbelt References: <20250823161326.635281786@linutronix.de> <20250823161655.319791141@linutronix.de> From: Mathieu Desnoyers Content-Language: en-US In-Reply-To: <20250823161655.319791141@linutronix.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: QB1P288CA0030.CANP288.PROD.OUTLOOK.COM (2603:10b6:c00:2d::43) To YT2PR01MB9175.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:be::5) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: YT2PR01MB9175:EE_|YQBPR0101MB8239:EE_ X-MS-Office365-Filtering-Correlation-Id: aff4a690-91ff-4923-6dd1-08dde40e761f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|366016|1800799024|7053199007; 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So no further action required here. > > Signed-off-by: Thomas Gleixner > Cc: x86@kernel.org Reviewed-by: Mathieu Desnoyers > --- > arch/x86/Kconfig | 1 > arch/x86/include/asm/thread_info.h | 74 +++++++++++++++---------------------- > 2 files changed, 31 insertions(+), 44 deletions(-) > > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -239,6 +239,7 @@ config X86 > select HAVE_EFFICIENT_UNALIGNED_ACCESS > select HAVE_EISA if X86_32 > select HAVE_EXIT_THREAD > + select HAVE_GENERIC_TIF_BITS > select HAVE_GUP_FAST > select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE > select HAVE_FTRACE_GRAPH_FUNC if HAVE_FUNCTION_GRAPH_TRACER > --- a/arch/x86/include/asm/thread_info.h > +++ b/arch/x86/include/asm/thread_info.h > @@ -80,56 +80,42 @@ struct thread_info { > #endif > > /* > - * thread information flags > - * - these are process state flags that various assembly files > - * may need to access > + * Tell the generic TIF infrastructure which bits x86 supports > */ > -#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ > -#define TIF_SIGPENDING 2 /* signal pending */ > -#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ > -#define TIF_NEED_RESCHED_LAZY 4 /* Lazy rescheduling needed */ > -#define TIF_SINGLESTEP 5 /* reenable singlestep on user return*/ > -#define TIF_SSBD 6 /* Speculative store bypass disable */ > -#define TIF_SPEC_IB 9 /* Indirect branch speculation mitigation */ > -#define TIF_SPEC_L1D_FLUSH 10 /* Flush L1D on mm switches (processes) */ > -#define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */ > -#define TIF_UPROBE 12 /* breakpointed or singlestepping */ > -#define TIF_PATCH_PENDING 13 /* pending live patching update */ > -#define TIF_NEED_FPU_LOAD 14 /* load FPU on return to userspace */ > -#define TIF_NOCPUID 15 /* CPUID is not accessible in userland */ > -#define TIF_NOTSC 16 /* TSC is not accessible in userland */ > -#define TIF_NOTIFY_SIGNAL 17 /* signal notifications exist */ > -#define TIF_MEMDIE 20 /* is terminating due to OOM killer */ > -#define TIF_POLLING_NRFLAG 21 /* idle is polling for TIF_NEED_RESCHED */ > +#define HAVE_TIF_NEED_RESCHED_LAZY > +#define HAVE_TIF_POLLING_NRFLAG > +#define HAVE_TIF_SINGLESTEP > + > +#include > + > +/* Architecture specific TIF space starts at 16 */ > +#define TIF_SSBD 16 /* Speculative store bypass disable */ > +#define TIF_SPEC_IB 17 /* Indirect branch speculation mitigation */ > +#define TIF_SPEC_L1D_FLUSH 18 /* Flush L1D on mm switches (processes) */ > +#define TIF_NEED_FPU_LOAD 19 /* load FPU on return to userspace */ > +#define TIF_NOCPUID 20 /* CPUID is not accessible in userland */ > +#define TIF_NOTSC 21 /* TSC is not accessible in userland */ > #define TIF_IO_BITMAP 22 /* uses I/O bitmap */ > #define TIF_SPEC_FORCE_UPDATE 23 /* Force speculation MSR update in context switch */ > #define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ > -#define TIF_BLOCKSTEP 25 /* set when we want DEBUGCTLMSR_BTF */ > +#define TIF_SINGLESTEP 25 /* reenable singlestep on user return*/ > +#define TIF_BLOCKSTEP 26 /* set when we want DEBUGCTLMSR_BTF */ > #define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */ > -#define TIF_ADDR32 29 /* 32-bit address space on 64 bits */ > +#define TIF_ADDR32 28 /* 32-bit address space on 64 bits */ > > -#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) > -#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) > -#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) > -#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY) > -#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) > -#define _TIF_SSBD (1 << TIF_SSBD) > -#define _TIF_SPEC_IB (1 << TIF_SPEC_IB) > -#define _TIF_SPEC_L1D_FLUSH (1 << TIF_SPEC_L1D_FLUSH) > -#define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY) > -#define _TIF_UPROBE (1 << TIF_UPROBE) > -#define _TIF_PATCH_PENDING (1 << TIF_PATCH_PENDING) > -#define _TIF_NEED_FPU_LOAD (1 << TIF_NEED_FPU_LOAD) > -#define _TIF_NOCPUID (1 << TIF_NOCPUID) > -#define _TIF_NOTSC (1 << TIF_NOTSC) > -#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) > -#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) > -#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP) > -#define _TIF_SPEC_FORCE_UPDATE (1 << TIF_SPEC_FORCE_UPDATE) > -#define _TIF_FORCED_TF (1 << TIF_FORCED_TF) > -#define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP) > -#define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES) > -#define _TIF_ADDR32 (1 << TIF_ADDR32) > +#define _TIF_SSBD BIT(TIF_SSBD) > +#define _TIF_SPEC_IB BIT(TIF_SPEC_IB) > +#define _TIF_SPEC_L1D_FLUSH BIT(TIF_SPEC_L1D_FLUSH) > +#define _TIF_NEED_FPU_LOAD BIT(TIF_NEED_FPU_LOAD) > +#define _TIF_NOCPUID BIT(TIF_NOCPUID) > +#define _TIF_NOTSC BIT(TIF_NOTSC) > +#define _TIF_IO_BITMAP BIT(TIF_IO_BITMAP) > +#define _TIF_SPEC_FORCE_UPDATE BIT(TIF_SPEC_FORCE_UPDATE) > +#define _TIF_FORCED_TF BIT(TIF_FORCED_TF) > +#define _TIF_BLOCKSTEP BIT(TIF_BLOCKSTEP) > +#define _TIF_SINGLESTEP BIT(TIF_SINGLESTEP) > +#define _TIF_LAZY_MMU_UPDATES BIT(TIF_LAZY_MMU_UPDATES) > +#define _TIF_ADDR32 BIT(TIF_ADDR32) > > /* flags to check in __switch_to() */ > #define _TIF_WORK_CTXSW_BASE \ > -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com