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McKenney" , Boqun Feng , Paolo Bonzini , Sean Christopherson , Wei Liu , Dexuan Cui , x86@kernel.org, Heiko Carstens , Christian Borntraeger , Sven Schnelle , Huacai Chen , Paul Walmsley , Palmer Dabbelt References: <20250823161326.635281786@linutronix.de> <20250823161655.256689417@linutronix.de> From: Mathieu Desnoyers Content-Language: en-US In-Reply-To: <20250823161655.256689417@linutronix.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: QB1P288CA0021.CANP288.PROD.OUTLOOK.COM (2603:10b6:c00:2d::34) 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_|YT1PR01MB8777:EE_ X-MS-Office365-Filtering-Correlation-Id: d4c90cdb-9955-454e-3c82-08dde40e4365 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|366016|376014|1800799024|7053199007; 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They can > be defined in a generic header. > > That allows adding generic TIF bits without chasing a gazillion of > architecture headers, which is again a unjustified burden on anyone who > works on generic infrastructure as it always needs a boat load of work to > keep existing architecture code working when adding new stuff. > > While it is not as horrible as the ignorance of the generic entry > infrastructure, it is a welcome mechanism to make architecture people > rethink their approach of just leaching generic improvements into > architecture code and thereby making it accumulatingly harder to maintain > and improve generic code. It's about time that this changea. changes > > Provide the infrastructure and split the TIF space in half, 16 generic and > 16 architecture specific bits. > > This could probably be extended by TIF_SINGLESTEP and BLOCKSTEP, but those > are only used in architecture specific code. So leave them alone for now. > > Signed-off-by: Thomas Gleixner > Cc: Arnd Bergmann Reviewed-by: Mathieu Desnoyers > --- > arch/Kconfig | 4 ++ > include/asm-generic/thread_info_tif.h | 48 ++++++++++++++++++++++++++++++++++ > 2 files changed, 52 insertions(+) > > --- a/arch/Kconfig > +++ b/arch/Kconfig > @@ -1730,6 +1730,10 @@ config ARCH_VMLINUX_NEEDS_RELOCS > relocations preserved. This is used by some architectures to > construct bespoke relocation tables for KASLR. > > +# Select if architecture uses the common generic TIF bits > +config HAVE_GENERIC_TIF_BITS > + bool > + > source "kernel/gcov/Kconfig" > > source "scripts/gcc-plugins/Kconfig" > --- /dev/null > +++ b/include/asm-generic/thread_info_tif.h > @@ -0,0 +1,48 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +#ifndef _ASM_GENERIC_THREAD_INFO_TIF_H_ > +#define _ASM_GENERIC_THREAD_INFO_TIF_H_ > + > +#include > + > +/* Bits 16-31 are reserved for architecture specific purposes */ > + > +#define TIF_NOTIFY_RESUME 0 // callback before returning to user > +#define _TIF_NOTIFY_RESUME BIT(TIF_NOTIFY_RESUME) > + > +#define TIF_SIGPENDING 1 // signal pending > +#define _TIF_SIGPENDING BIT(TIF_SIGPENDING) > + > +#define TIF_NOTIFY_SIGNAL 2 // signal notifications exist > +#define _TIF_NOTIFY_SIGNAL BIT(TIF_NOTIFY_SIGNAL) > + > +#define TIF_MEMDIE 3 // is terminating due to OOM killer > +#define _TIF_MEMDIE BIT(TIF_MEMDIE) > + > +#define TIF_NEED_RESCHED 4 // rescheduling necessary > +#define _TIF_NEED_RESCHED BIT(TIF_NEED_RESCHED) > + > +#ifdef HAVE_TIF_NEED_RESCHED_LAZY > +# define TIF_NEED_RESCHED_LAZY 5 // Lazy rescheduling needed > +# define _TIF_NEED_RESCHED_LAZY BIT(TIF_NEED_RESCHED_LAZY) > +#endif > + > +#ifdef HAVE_TIF_POLLING_NRFLAG > +# define TIF_POLLING_NRFLAG 6 // idle is polling for TIF_NEED_RESCHED > +# define _TIF_POLLING_NRFLAG BIT(TIF_POLLING_NRFLAG) > +#endif > + > +#define TIF_USER_RETURN_NOTIFY 7 // notify kernel of userspace return > +#define _TIF_USER_RETURN_NOTIFY BIT(TIF_USER_RETURN_NOTIFY) > + > +#define TIF_UPROBE 8 // breakpointed or singlestepping > +#define _TIF_UPROBE BIT(TIF_UPROBE) > + > +#define TIF_PATCH_PENDING 9 // pending live patching update > +#define _TIF_PATCH_PENDING BIT(TIF_PATCH_PENDING) > + > +#ifdef HAVE_TIF_RESTORE_SIGMASK > +# define TIF_RESTORE_SIGMASK 10 // Restore signal mask in do_signal() */ > +# define _TIF_RESTORE_SIGMASK BIT(TIF_RESTORE_SIGMASK) > +#endif > + > +#endif /* _ASM_GENERIC_THREAD_INFO_TIF_H_ */ > -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com