| Message ID | 1691581193-8416-6-git-send-email-mihai.carabas@oracle.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/7] cpuidle-haltpoll: Make boot_option_idle_override check X86 specific | expand |
On Wed, Aug 09, 2023 at 02:39:39PM +0300, Mihai Carabas wrote: > From: Joao Martins <joao.m.martins@oracle.com> > > cpu_relax() is necessary to allow cpuidle poll-state to be used, > so select it from ARM64 kconfig. > > Signed-off-by: Joao Martins <joao.m.martins@oracle.com> > Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com> > --- > arch/arm64/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 87ade6549790..7c47617b5722 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -105,6 +105,7 @@ config ARM64 > select ARCH_WANT_LD_ORPHAN_WARN > select ARCH_WANTS_NO_INSTR > select ARCH_WANTS_THP_SWAP if ARM64_4K_PAGES > + select ARCH_HAS_CPU_RELAX > select ARCH_HAS_UBSAN_SANITIZE_ALL > select ARM_AMBA > select ARM_ARCH_TIMER Uh what ?! cpu_relax() is assumed present on all archs, no?
On Wed, Aug 09, 2023 at 03:49:41PM +0200, Peter Zijlstra wrote: > On Wed, Aug 09, 2023 at 02:39:39PM +0300, Mihai Carabas wrote: > > From: Joao Martins <joao.m.martins@oracle.com> > > > > cpu_relax() is necessary to allow cpuidle poll-state to be used, > > so select it from ARM64 kconfig. > > > > Signed-off-by: Joao Martins <joao.m.martins@oracle.com> > > Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com> > > --- > > arch/arm64/Kconfig | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > > index 87ade6549790..7c47617b5722 100644 > > --- a/arch/arm64/Kconfig > > +++ b/arch/arm64/Kconfig > > @@ -105,6 +105,7 @@ config ARM64 > > select ARCH_WANT_LD_ORPHAN_WARN > > select ARCH_WANTS_NO_INSTR > > select ARCH_WANTS_THP_SWAP if ARM64_4K_PAGES > > + select ARCH_HAS_CPU_RELAX > > select ARCH_HAS_UBSAN_SANITIZE_ALL > > select ARM_AMBA > > select ARM_ARCH_TIMER > > Uh what ?! cpu_relax() is assumed present on all archs, no? I think you have x86 to blame for that! That symbol is used in drivers/acpi/processor_idle.c to setup stuff for the cpuidle polling, and also by cpuidle's Makefile to build poll_state.o It isn't to do with the presence of cpu_relax() or not. It probably ought to be renamed to CPUIDLE_CPU_RELAX which would better describe its modern purpose.
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 87ade6549790..7c47617b5722 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -105,6 +105,7 @@ config ARM64 select ARCH_WANT_LD_ORPHAN_WARN select ARCH_WANTS_NO_INSTR select ARCH_WANTS_THP_SWAP if ARM64_4K_PAGES + select ARCH_HAS_CPU_RELAX select ARCH_HAS_UBSAN_SANITIZE_ALL select ARM_AMBA select ARM_ARCH_TIMER