Messages in this thread Patch in this message | | | From | Ankur Arora <> | Subject | [PATCH 17/30] x86/thread_info: define TIF_NEED_RESCHED_LAZY | Date | Mon, 12 Feb 2024 21:55:41 -0800 |
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Define TIF_NEED_RESCHED_LAZY which, with TIF_NEED_RESCHED provides the scheduler with two kinds of rescheduling intent: TIF_NEED_RESCHED, for the usual rescheduling at the next safe preemption point; TIF_NEED_RESCHED_LAZY expressing an intent to reschedule at some time in the future while allowing the current task to run to completion.
Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Originally-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/lkml/87jzshhexi.ffs@tglx/ Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com> --- arch/x86/Kconfig | 1 + arch/x86/include/asm/thread_info.h | 10 ++++++++-- 2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5edec175b9bf..ab58558068a4 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -275,6 +275,7 @@ config X86 select HAVE_STATIC_CALL select HAVE_STATIC_CALL_INLINE if HAVE_OBJTOOL select HAVE_PREEMPT_DYNAMIC_CALL + select HAVE_PREEMPT_AUTO select HAVE_RSEQ select HAVE_RUST if X86_64 select HAVE_SYSCALL_TRACEPOINTS diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index d63b02940747..88c1802185fc 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -81,8 +81,11 @@ struct thread_info { #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_SINGLESTEP 4 /* reenable singlestep on user return*/ -#define TIF_SSBD 5 /* Speculative store bypass disable */ +#ifdef CONFIG_PREEMPT_AUTO +#define TIF_NEED_RESCHED_LAZY 4 /* Lazy rescheduling */ +#endif +#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 */ @@ -104,6 +107,9 @@ struct thread_info { #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) +#ifdef CONFIG_PREEMPT_AUTO +#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY) +#endif #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) #define _TIF_SSBD (1 << TIF_SSBD) #define _TIF_SPEC_IB (1 << TIF_SPEC_IB) -- 2.31.1
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