search for: smp_xxx

...8 +0200 > > "Michael S. Tsirkin" <mst at redhat.com> wrote: > > > > > On Mon, Jan 04, 2016 at 02:45:25PM +0100, Peter Zijlstra wrote: > > > > On Thu, Dec 31, 2015 at 09:08:38PM +0200, Michael S. Tsirkin wrote: > > > > > This defines __smp_xxx barriers for s390, > > > > > for use by virtualization. > > > > > > > > > > Some smp_xxx barriers are removed as they are > > > > > defined correctly by asm-generic/barriers.h > > > > > > > > > > Note: smp_m...

...8 +0200 > > "Michael S. Tsirkin" <mst at redhat.com> wrote: > > > > > On Mon, Jan 04, 2016 at 02:45:25PM +0100, Peter Zijlstra wrote: > > > > On Thu, Dec 31, 2015 at 09:08:38PM +0200, Michael S. Tsirkin wrote: > > > > > This defines __smp_xxx barriers for s390, > > > > > for use by virtualization. > > > > > > > > > > Some smp_xxx barriers are removed as they are > > > > > defined correctly by asm-generic/barriers.h > > > > > > > > > > Note: smp_m...

On Mon, 4 Jan 2016 22:18:58 +0200 "Michael S. Tsirkin" <mst at redhat.com> wrote: > On Mon, Jan 04, 2016 at 02:45:25PM +0100, Peter Zijlstra wrote: > > On Thu, Dec 31, 2015 at 09:08:38PM +0200, Michael S. Tsirkin wrote: > > > This defines __smp_xxx barriers for s390, > > > for use by virtualization. > > > > > > Some smp_xxx barriers are removed as they are > > > defined correctly by asm-generic/barriers.h > > > > > > Note: smp_mb, smp_rmb and smp_wmb are defined as full barriers > &gt...

On Mon, 4 Jan 2016 22:18:58 +0200 "Michael S. Tsirkin" <mst at redhat.com> wrote: > On Mon, Jan 04, 2016 at 02:45:25PM +0100, Peter Zijlstra wrote: > > On Thu, Dec 31, 2015 at 09:08:38PM +0200, Michael S. Tsirkin wrote: > > > This defines __smp_xxx barriers for s390, > > > for use by virtualization. > > > > > > Some smp_xxx barriers are removed as they are > > > defined correctly by asm-generic/barriers.h > > > > > > Note: smp_mb, smp_rmb and smp_wmb are defined as full barriers > &gt...

...n Mon, 4 Jan 2016 22:18:58 +0200 > "Michael S. Tsirkin" <mst at redhat.com> wrote: > > > On Mon, Jan 04, 2016 at 02:45:25PM +0100, Peter Zijlstra wrote: > > > On Thu, Dec 31, 2015 at 09:08:38PM +0200, Michael S. Tsirkin wrote: > > > > This defines __smp_xxx barriers for s390, > > > > for use by virtualization. > > > > > > > > Some smp_xxx barriers are removed as they are > > > > defined correctly by asm-generic/barriers.h > > > > > > > > Note: smp_mb, smp_rmb and smp_wmb are def...

On Thu, Dec 31, 2015 at 09:08:38PM +0200, Michael S. Tsirkin wrote: > This defines __smp_xxx barriers for s390, > for use by virtualization. > > Some smp_xxx barriers are removed as they are > defined correctly by asm-generic/barriers.h > > Note: smp_mb, smp_rmb and smp_wmb are defined as full barriers > unconditionally on this architecture. > > Signed-off-by:...

On Thu, Dec 31, 2015 at 09:08:38PM +0200, Michael S. Tsirkin wrote: > This defines __smp_xxx barriers for s390, > for use by virtualization. > > Some smp_xxx barriers are removed as they are > defined correctly by asm-generic/barriers.h > > Note: smp_mb, smp_rmb and smp_wmb are defined as full barriers > unconditionally on this architecture. > > Signed-off-by:...

...uot;Michael S. Tsirkin" <mst at redhat.com> wrote: > > > > > > > On Mon, Jan 04, 2016 at 02:45:25PM +0100, Peter Zijlstra wrote: > > > > > On Thu, Dec 31, 2015 at 09:08:38PM +0200, Michael S. Tsirkin wrote: > > > > > > This defines __smp_xxx barriers for s390, > > > > > > for use by virtualization. > > > > > > > > > > > > Some smp_xxx barriers are removed as they are > > > > > > defined correctly by asm-generic/barriers.h > > > > > > > > &...

On Mon, Jan 04, 2016 at 02:45:25PM +0100, Peter Zijlstra wrote: > On Thu, Dec 31, 2015 at 09:08:38PM +0200, Michael S. Tsirkin wrote: > > This defines __smp_xxx barriers for s390, > > for use by virtualization. > > > > Some smp_xxx barriers are removed as they are > > defined correctly by asm-generic/barriers.h > > > > Note: smp_mb, smp_rmb and smp_wmb are defined as full barriers > > unconditionally on this arch...

...f CONFIG_SMP #define smp_mb() __smp_mb() #else #define smp_mb() barrier() #endif This has the benefit of cleaning out a bunch of duplicated ifdefs on a bunch of architectures - this patchset brings about a net reduction in LOC, even with new barriers and extra documentation :) Then virt can use __smp_XXX when talking to an SMP host. To make those users explicit, this patchset adds virt_xxx wrappers for them. Touching all archs is a tad tedious, but its fairly straight forward. The rest of the patchset is structured as follows: -. Patch 1 fixes a bug in asm-generic. It is already in tip, incl...

...f CONFIG_SMP #define smp_mb() __smp_mb() #else #define smp_mb() barrier() #endif This has the benefit of cleaning out a bunch of duplicated ifdefs on a bunch of architectures - this patchset brings about a net reduction in LOC, even with new barriers and extra documentation :) Then virt can use __smp_XXX when talking to an SMP host. To make those users explicit, this patchset adds virt_xxx wrappers for them. Touching all archs is a tad tedious, but its fairly straight forward. The rest of the patchset is structured as follows: -. Patch 1 fixes a bug in asm-generic. It is already in tip, incl...

...: #ifdef CONFIG_SMP #define smp_mb() __smp_mb() #else #define smp_mb() barrier() #endif This has the benefit of cleaning out a bunch of duplicated ifdefs on a bunch of architectures - this patchset brings about a net reduction in LOC, compensated for by extra documentation :) Then virt can use __smp_XXX when talking to an SMP host. Touching all archs is a tad tedious, but its fairly straight forward. The rest of the patchset is structured as follows: -. Patch 1 documents the __smp APIs, and explains why they are useful for virt -. Patches 2-7 makes sure barrier.h on ia64, powerpc, s390 and...

...: #ifdef CONFIG_SMP #define smp_mb() __smp_mb() #else #define smp_mb() barrier() #endif This has the benefit of cleaning out a bunch of duplicated ifdefs on a bunch of architectures - this patchset brings about a net reduction in LOC, compensated for by extra documentation :) Then virt can use __smp_XXX when talking to an SMP host. Touching all archs is a tad tedious, but its fairly straight forward. The rest of the patchset is structured as follows: -. Patch 1 documents the __smp APIs, and explains why they are useful for virt -. Patches 2-7 makes sure barrier.h on ia64, powerpc, s390 and...

On Thu, Dec 31, 2015 at 09:07:59PM +0200, Michael S. Tsirkin wrote: > This defines __smp_xxx barriers for arm, > for use by virtualization. > > smp_xxx barriers are removed as they are > defined correctly by asm-generic/barriers.h > > This reduces the amount of arch-specific boiler-plate code. > > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > A...

On Thu, Dec 31, 2015 at 09:07:59PM +0200, Michael S. Tsirkin wrote: > This defines __smp_xxx barriers for arm, > for use by virtualization. > > smp_xxx barriers are removed as they are > defined correctly by asm-generic/barriers.h > > This reduces the amount of arch-specific boiler-plate code. > > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > A...

Hi Michael, On Thu, Dec 31, 2015 at 09:07:42PM +0200, Michael S. Tsirkin wrote: > This defines __smp_xxx barriers for powerpc > for use by virtualization. > > smp_xxx barriers are removed as they are > defined correctly by asm-generic/barriers.h > > This reduces the amount of arch-specific boiler-plate code. > > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> &gt...

Changes since v2: - extended checkpatch tests for barriers, and added patches teaching it to warn about incorrect usage of barriers (__smp_xxx barriers are for use by asm-generic code only), should help prevent misuse by arch code to address comments by Russell King - patched more instances of xen to use virt_ barriers as suggested by Stefano Stabellini - implemented a 2 byte xchg on sh instead of hacking around it as suggested by...

Changes since v2: - extended checkpatch tests for barriers, and added patches teaching it to warn about incorrect usage of barriers (__smp_xxx barriers are for use by asm-generic code only), should help prevent misuse by arch code to address comments by Russell King - patched more instances of xen to use virt_ barriers as suggested by Stefano Stabellini - implemented a 2 byte xchg on sh instead of hacking around it as suggested by...

Hi Michael, On Thu, Dec 31, 2015 at 09:07:42PM +0200, Michael S. Tsirkin wrote: > This defines __smp_xxx barriers for powerpc > for use by virtualization. > > smp_xxx barriers are removed as they are > defined correctly by asm-generic/barriers.h > > This reduces the amount of arch-specific boiler-plate code. > > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> &gt...

Hi Michael, On Thu, Dec 31, 2015 at 09:08:22PM +0200, Michael S. Tsirkin wrote: > This defines __smp_xxx barriers for metag, > for use by virtualization. > > smp_xxx barriers are removed as they are > defined correctly by asm-generic/barriers.h > > Note: as __smp_XX macros should not depend on CONFIG_SMP, they can not > use the existing fence() macro since that is defined differ...