Displaying 5 results from an estimated 5 matches for "fa2e2ef72b68".
2019 Jan 07
2
[PATCH RFC 3/4] barriers: convert a control to a data dependency
...ies.
> */
> +#define ARCH_NEEDS_READ_BARRIER_DEPENDS 1
> #define read_barrier_depends() __asm__ __volatile__("mb": : :"memory")
>
> #ifdef CONFIG_SMP
> diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h
> index 2cafdbb9ae4c..fa2e2ef72b68 100644
> --- a/include/asm-generic/barrier.h
> +++ b/include/asm-generic/barrier.h
> @@ -70,6 +70,24 @@
> #define __smp_read_barrier_depends() read_barrier_depends()
> #endif
>
> +#if defined(COMPILER_HAS_OPTIMIZER_HIDE_VAR) && \
> + !defined(ARCH_NEEDS_READ_B...
2019 Jan 07
2
[PATCH RFC 3/4] barriers: convert a control to a data dependency
...ies.
> */
> +#define ARCH_NEEDS_READ_BARRIER_DEPENDS 1
> #define read_barrier_depends() __asm__ __volatile__("mb": : :"memory")
>
> #ifdef CONFIG_SMP
> diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h
> index 2cafdbb9ae4c..fa2e2ef72b68 100644
> --- a/include/asm-generic/barrier.h
> +++ b/include/asm-generic/barrier.h
> @@ -70,6 +70,24 @@
> #define __smp_read_barrier_depends() read_barrier_depends()
> #endif
>
> +#if defined(COMPILER_HAS_OPTIMIZER_HIDE_VAR) && \
> + !defined(ARCH_NEEDS_READ_B...
2019 Jan 02
0
[PATCH RFC 3/4] barriers: convert a control to a data dependency
...this where there are no data dependencies.
*/
+#define ARCH_NEEDS_READ_BARRIER_DEPENDS 1
#define read_barrier_depends() __asm__ __volatile__("mb": : :"memory")
#ifdef CONFIG_SMP
diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h
index 2cafdbb9ae4c..fa2e2ef72b68 100644
--- a/include/asm-generic/barrier.h
+++ b/include/asm-generic/barrier.h
@@ -70,6 +70,24 @@
#define __smp_read_barrier_depends() read_barrier_depends()
#endif
+#if defined(COMPILER_HAS_OPTIMIZER_HIDE_VAR) && \
+ !defined(ARCH_NEEDS_READ_BARRIER_DEPENDS)
+
+#define dependent_ptr_mb...
2019 Jan 02
6
[PATCH RFC 0/4] barriers using data dependency
So as explained in Documentation/memory-barriers.txt e.g.
a load followed by a store require a full memory barrier,
to avoid store being ordered before the load.
Similarly load-load requires a read memory barrier.
Thinking about it, we can actually create a data dependency
by mixing the first loaded value into the pointer being
accessed.
This adds an API for this and uses it in virtio.
Written
2019 Jan 07
0
[PATCH RFC 3/4] barriers: convert a control to a data dependency
...gt; > +#define ARCH_NEEDS_READ_BARRIER_DEPENDS 1
> > #define read_barrier_depends() __asm__ __volatile__("mb": : :"memory")
> > #ifdef CONFIG_SMP
> > diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h
> > index 2cafdbb9ae4c..fa2e2ef72b68 100644
> > --- a/include/asm-generic/barrier.h
> > +++ b/include/asm-generic/barrier.h
> > @@ -70,6 +70,24 @@
> > #define __smp_read_barrier_depends() read_barrier_depends()
> > #endif
> > +#if defined(COMPILER_HAS_OPTIMIZER_HIDE_VAR) && \
> > +...