On Tue, Oct 1, 2024 at 4:11 PM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > > On Tue, 01 Oct 2024 13:29:58 +0000 > Alice Ryhl <aliceryhl@xxxxxxxxxx> wrote: > > > Add just enough support for static key so that we can use it from > > tracepoints. Tracepoints rely on `static_key_false` even though it is > > deprecated, so we add the same functionality to Rust. > > > > This patch only provides a generic implementation without code patching > > (matching the one used when CONFIG_JUMP_LABEL is disabled). Later > > patches add support for inline asm implementations that use runtime > > patching. > > > > When CONFIG_JUMP_LABEL is unset, `static_key_count` is a static inline > > function, so a Rust helper is defined for `static_key_count` in this > > case. If Rust is compiled with LTO, this call should get inlined. The > > helper can be eliminated once we have the necessary inline asm to make > > atomic operations from Rust. > > > > Reviewed-by: Boqun Feng <boqun.feng@xxxxxxxxx> > > Signed-off-by: Alice Ryhl <aliceryhl@xxxxxxxxxx> > > --- > > rust/bindings/bindings_helper.h | 1 + > > rust/helpers/helpers.c | 1 + > > rust/helpers/jump_label.c | 15 +++++++++++++++ > > rust/kernel/jump_label.rs | 29 +++++++++++++++++++++++++++++ > > rust/kernel/lib.rs | 1 + > > 5 files changed, 47 insertions(+) > > > > diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h > > index ae82e9c941af..e0846e7e93e6 100644 > > --- a/rust/bindings/bindings_helper.h > > +++ b/rust/bindings/bindings_helper.h > > @@ -14,6 +14,7 @@ > > #include <linux/ethtool.h> > > #include <linux/firmware.h> > > #include <linux/jiffies.h> > > +#include <linux/jump_label.h> > > #include <linux/mdio.h> > > #include <linux/phy.h> > > #include <linux/refcount.h> > > diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c > > index 30f40149f3a9..17e1b60d178f 100644 > > --- a/rust/helpers/helpers.c > > +++ b/rust/helpers/helpers.c > > @@ -12,6 +12,7 @@ > > #include "build_assert.c" > > #include "build_bug.c" > > #include "err.c" > > +#include "jump_label.c" > > #include "kunit.c" > > #include "mutex.c" > > #include "page.c" > > diff --git a/rust/helpers/jump_label.c b/rust/helpers/jump_label.c > > new file mode 100644 > > index 000000000000..0e9ed15903f6 > > --- /dev/null > > +++ b/rust/helpers/jump_label.c > > @@ -0,0 +1,15 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > + > > +/* > > + * Copyright (C) 2024 Google LLC. > > + */ > > + > > +#include <linux/jump_label.h> > > + > > Nit, the above line has a spurious space. Thanks. Looks like the function body also uses 7 spaces instead of a tab. I'll fix it. Alice
