Displaying 5 results from an estimated 5 matches for "f599c30f1b28".
2019 Jan 07
2
[PATCH RFC 3/4] barriers: convert a control to a data dependency
...); (ptr); })
So for the example of patch 4, we'd better fall back to rmb() or need a
dependent_ptr_rmb()?
Thanks
> +
> +#endif
> +
> #ifdef CONFIG_SMP
>
> #ifndef smp_mb
> diff --git a/include/linux/compiler.h b/include/linux/compiler.h
> index 6601d39e8c48..f599c30f1b28 100644
> --- a/include/linux/compiler.h
> +++ b/include/linux/compiler.h
> @@ -152,9 +152,13 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
> #endif
>
> #ifndef OPTIMIZER_HIDE_VAR
> +
> /* Make the optimizer believe the variable can be manipulat...
2019 Jan 07
2
[PATCH RFC 3/4] barriers: convert a control to a data dependency
...); (ptr); })
So for the example of patch 4, we'd better fall back to rmb() or need a
dependent_ptr_rmb()?
Thanks
> +
> +#endif
> +
> #ifdef CONFIG_SMP
>
> #ifndef smp_mb
> diff --git a/include/linux/compiler.h b/include/linux/compiler.h
> index 6601d39e8c48..f599c30f1b28 100644
> --- a/include/linux/compiler.h
> +++ b/include/linux/compiler.h
> @@ -152,9 +152,13 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
> #endif
>
> #ifndef OPTIMIZER_HIDE_VAR
> +
> /* Make the optimizer believe the variable can be manipulat...
2019 Jan 02
0
[PATCH RFC 3/4] barriers: convert a control to a data dependency
..._VAR(dependent_ptr_mb_val); \
+ (typeof(ptr))(dependent_ptr_mb_ptr + dependent_ptr_mb_val); \
+})
+
+#else
+
+#define dependent_ptr_mb(ptr, val) ({ mb(); (ptr); })
+
+#endif
+
#ifdef CONFIG_SMP
#ifndef smp_mb
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 6601d39e8c48..f599c30f1b28 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -152,9 +152,13 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#endif
#ifndef OPTIMIZER_HIDE_VAR
+
/* Make the optimizer believe the variable can be manipulated arbitrarily. */
#define OPTIMIZER_HIDE_V...
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
..._rmb and dependent_ptr_virt_rmb.
mb variant is unused right now so I'll remove it.
>
> > +
> > +#endif
> > +
> > #ifdef CONFIG_SMP
> > #ifndef smp_mb
> > diff --git a/include/linux/compiler.h b/include/linux/compiler.h
> > index 6601d39e8c48..f599c30f1b28 100644
> > --- a/include/linux/compiler.h
> > +++ b/include/linux/compiler.h
> > @@ -152,9 +152,13 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
> > #endif
> > #ifndef OPTIMIZER_HIDE_VAR
> > +
> > /* Make the optimizer believe th...