From: "Gary Guo" <gary@garyguo.net>
To: "Jan Polensky" <japo@linux.ibm.com>, <hca@linux.ibm.com>,
<gor@linux.ibm.com>, <agordeev@linux.ibm.com>, <ojeda@kernel.org>,
<peterz@infradead.org>, <jpoimboe@kernel.org>,
<jbaron@akamai.com>, <aliceryhl@google.com>
Cc: <borntraeger@linux.ibm.com>, <svens@linux.ibm.com>,
<boqun@kernel.org>, <gary@garyguo.net>,
<bjorn3_gh@protonmail.com>, <lossin@kernel.org>,
<a.hindborg@kernel.org>, <tmgross@umich.edu>, <dakr@kernel.org>,
<rostedt@goodmis.org>, <ardb@kernel.org>,
<linux-s390@vger.kernel.org>, <rust-for-linux@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 2/4] s390/jump_label: Implement ARCH_STATIC_BRANCH_JUMP_ASM and ARCH_STATIC_BRANCH_ASM macros
Date: Wed, 27 May 2026 11:54:29 +0100 [thread overview]
Message-ID: <DITEJKC6AXB9.2E1R65TGGTX5W@garyguo.net> (raw)
In-Reply-To: <20260521165622.279953-3-japo@linux.ibm.com>
On Thu May 21, 2026 at 5:56 PM BST, Jan Polensky wrote:
> Rust static branch support needs the s390 jump label instruction sequence
> and __jump_table emission in a reusable form. The current implementation
> embeds the sequence directly in the C asm goto blocks, which cannot be
> shared with Rust.
>
> Introduce ARCH_STATIC_BRANCH_ASM and ARCH_STATIC_BRANCH_JUMP_ASM to
> describe the brcl sequences for the likely-false and likely-true cases
> and to emit the same __jump_table entries as before. Switch the existing
> C helpers to use the new macros to avoid duplication without changing
> the generated code.
>
> Signed-off-by: Jan Polensky <japo@linux.ibm.com>
Acked-by: Gary Guo <gary@garyguo.net>
> ---
> arch/s390/include/asm/jump_label.h | 33 +++++++++++++++++-------------
> 1 file changed, 19 insertions(+), 14 deletions(-)
next prev parent reply other threads:[~2026-05-27 10:54 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-21 16:56 [PATCH v3 0/4] s390: Enable Rust support and add required arch glue Jan Polensky
2026-05-21 16:56 ` [PATCH v3 1/4] s390/bug: Provide ARCH_WARN_ASM for Rust WARN/BUG support Jan Polensky
2026-05-27 10:54 ` Gary Guo
2026-05-21 16:56 ` [PATCH v3 2/4] s390/jump_label: Implement ARCH_STATIC_BRANCH_JUMP_ASM and ARCH_STATIC_BRANCH_ASM macros Jan Polensky
2026-05-27 5:57 ` Alice Ryhl
2026-05-27 21:06 ` Jan Polensky
2026-05-27 10:54 ` Gary Guo [this message]
2026-05-21 16:56 ` [PATCH v3 3/4] rust/bindgen_parameters: Mark s390 types as opaque to prevent repr conflicts Jan Polensky
2026-05-21 16:56 ` [PATCH v3 4/4] s390: Enable Rust support Jan Polensky
2026-05-27 5:59 ` Alice Ryhl
2026-05-27 6:53 ` Heiko Carstens
2026-05-27 8:27 ` Miguel Ojeda
2026-05-26 13:55 ` [PATCH v3 0/4] s390: Enable Rust support and add required arch glue Miguel Ojeda
2026-05-26 16:13 ` Heiko Carstens
2026-05-27 10:08 ` Miguel Ojeda
2026-05-27 10:38 ` Alice Ryhl
2026-05-27 12:10 ` Miguel Ojeda
2026-05-27 13:44 ` Heiko Carstens
2026-05-27 15:25 ` Miguel Ojeda
2026-05-27 10:53 ` Gary Guo
2026-05-27 12:13 ` Miguel Ojeda
2026-05-27 11:54 ` Gary Guo
2026-05-27 13:37 ` Heiko Carstens
2026-05-28 14:03 ` Jan Polensky
2026-05-28 14:14 ` Gary Guo
2026-05-29 15:04 ` Jan Polensky
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