search for: ppc_book3s_64

...will look into this - but it can > > be done by a patch on top, so I think this can be merged as is. > > > > This cross-endian *oddity* is targeting PowerPC book3s_64 processors... I > am not aware of any other users. Maybe create a symbol that would > be only selected by PPC_BOOK3S_64 ? I think some ARM systems are trying to support cross-endian configurations as well. Besides that, yes, this is more or less what I had in mind. > > > Or do you know of someone using kernel with all config options enabled > > undiscriminately? > > > > Thanks, > &...

...will look into this - but it can > > be done by a patch on top, so I think this can be merged as is. > > > > This cross-endian *oddity* is targeting PowerPC book3s_64 processors... I > am not aware of any other users. Maybe create a symbol that would > be only selected by PPC_BOOK3S_64 ? I think some ARM systems are trying to support cross-endian configurations as well. Besides that, yes, this is more or less what I had in mind. > > > Or do you know of someone using kernel with all config options enabled > > undiscriminately? > > > > Thanks, > &...

On Wed, Jul 01, 2015 at 12:02:50PM -0700, Linus Torvalds wrote: > On Wed, Jul 1, 2015 at 2:31 AM, Michael S. Tsirkin <mst at redhat.com> wrote: > > virtio/vhost: cross endian support > > Ugh. Does this really have to be dynamic? > > Can't virtio do the sane thing, and just use a _fixed_ endianness? > > Doing a unconditional byte swap is faster and simpler

On Wed, Jul 01, 2015 at 12:02:50PM -0700, Linus Torvalds wrote: > On Wed, Jul 1, 2015 at 2:31 AM, Michael S. Tsirkin <mst at redhat.com> wrote: > > virtio/vhost: cross endian support > > Ugh. Does this really have to be dynamic? > > Can't virtio do the sane thing, and just use a _fixed_ endianness? > > Doing a unconditional byte swap is faster and simpler

...rom enabling it e.g. on x86. I will look into this - but it can > be done by a patch on top, so I think this can be merged as is. > This cross-endian *oddity* is targeting PowerPC book3s_64 processors... I am not aware of any other users. Maybe create a symbol that would be only selected by PPC_BOOK3S_64 ? > Or do you know of someone using kernel with all config options enabled > undiscriminately? > > Thanks, >

...can > > > be done by a patch on top, so I think this can be merged as is. > > > > > > > This cross-endian *oddity* is targeting PowerPC book3s_64 processors... I > > am not aware of any other users. Maybe create a symbol that would > > be only selected by PPC_BOOK3S_64 ? > > I think some ARM systems are trying to support cross-endian > configurations as well. > > Besides that, yes, this is more or less what I had in mind. Would something simple like this already do the job: diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig --- a/driver...

...a57697 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -492,6 +494,17 @@ config HOTPLUG_CPU > > Say N if you are unsure. > > +config PPC_QUEUED_SPINLOCKS > + bool "Queued spinlocks" > + depends on SMP > + default "y" if PPC_BOOK3S_64 Not sure about default y? At least until we've got a better idea of the perf impact on a range of small/big new/old systems. > + help > + Say Y here to use to use queued spinlocks which are more complex > + but give better salability and fairness on large SMP and NUMA > + sy...

...S if PPC_QUEUED_SPINLOCKS select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WEAK_RELEASE_ACQUIRE select BINFMT_ELF @@ -490,6 +492,17 @@ config HOTPLUG_CPU Say N if you are unsure. +config PPC_QUEUED_SPINLOCKS + bool "Queued spinlocks" + depends on SMP + default "y" if PPC_BOOK3S_64 + help + Say Y here to use to use queued spinlocks which are more complex + but give better salability and fairness on large SMP and NUMA + systems. + + If unsure, say "Y" if you have lots of cores, otherwise "N". + config ARCH_CPU_PROBE_RELEASE def_bool y depends o...

...S if PPC_QUEUED_SPINLOCKS select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WEAK_RELEASE_ACQUIRE select BINFMT_ELF @@ -492,6 +494,17 @@ config HOTPLUG_CPU Say N if you are unsure. +config PPC_QUEUED_SPINLOCKS + bool "Queued spinlocks" + depends on SMP + default "y" if PPC_BOOK3S_64 + help + Say Y here to use to use queued spinlocks which are more complex + but give better salability and fairness on large SMP and NUMA + systems. + + If unsure, say "Y" if you have lots of cores, otherwise "N". + config ARCH_CPU_PROBE_RELEASE def_bool y depends o...

...e by a patch on top, so I think this can be merged as is. > > > > > > > > > > This cross-endian *oddity* is targeting PowerPC book3s_64 processors... I > > > am not aware of any other users. Maybe create a symbol that would > > > be only selected by PPC_BOOK3S_64 ? > > > > I think some ARM systems are trying to support cross-endian > > configurations as well. > > > > Besides that, yes, this is more or less what I had in mind. > > Would something simple like this already do the job: > > diff --git a/drivers/vhost...

...e by a patch on top, so I think this can be merged as is. > > > > > > > > > > This cross-endian *oddity* is targeting PowerPC book3s_64 processors... I > > > am not aware of any other users. Maybe create a symbol that would > > > be only selected by PPC_BOOK3S_64 ? > > > > I think some ARM systems are trying to support cross-endian > > configurations as well. > > > > Besides that, yes, this is more or less what I had in mind. > > Would something simple like this already do the job: > > diff --git a/drivers/vhost...

...s file. This is only useful for kernel developers who are working in architecture specific areas of the kernel - probably @@ -390,8 +390,8 @@ config PPC_DEBUG_WX config PPC_FAST_ENDIAN_SWITCH bool "Deprecated fast endian-switch syscall" - depends on DEBUG_KERNEL && PPC_BOOK3S_64 - help + depends on DEBUG_KERNEL && PPC_BOOK3S_64 + help If you're unsure what this is, say N. config KASAN_SHADOW_OFFSET diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index 12543e53fa96..073b6cb6d1ac 100644 --- a/arch/powerpc...

v3 is updated to use __pv_queued_spin_unlock, noticed by Waiman (thank you). Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued spinlocks and rwlocks powerpc/pseries: implement paravirt

v3 is updated to use __pv_queued_spin_unlock, noticed by Waiman (thank you). Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued spinlocks and rwlocks powerpc/pseries: implement paravirt

v2 is updated to account for feedback from Will, Peter, and Waiman (thank you), and trims off a couple of RFC and unrelated patches. Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued

This series adds an option to use queued spinlocks for powerpc, and makes it the default for the Book3S-64 subarch. This effort starts with the generic code so it's very simple but still very performant. There are optimisations that can be made to slowpaths, but I think it's better to attack those incrementally if/when we find things, and try to add the improvements to generic code as

Adjust indentation from spaces to tab (+optional two spaces) as in coding style with command like: $ sed -e 's/^ /\t/' -i */Kconfig Signed-off-by: Krzysztof Kozlowski <krzk at kernel.org> --- drivers/acpi/Kconfig | 8 +- drivers/ata/Kconfig | 12 +-- drivers/auxdisplay/Kconfig | 14 +--

Adjust indentation from spaces to tab (+optional two spaces) as in coding style with command like: $ sed -e 's/^ /\t/' -i */Kconfig Signed-off-by: Krzysztof Kozlowski <krzk at kernel.org> --- drivers/acpi/Kconfig | 8 +- drivers/ata/Kconfig | 12 +-- drivers/auxdisplay/Kconfig | 14 +--