From: "Mukesh Kumar Chaurasiya (IBM)" <mkchauras@gmail.com>
To: linkmauve@linkmauve.fr, ojeda@kernel.org, boqun.feng@gmail.com,
gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org,
a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu,
dakr@kernel.org, corbet@lwn.net, maddy@linux.ibm.com,
mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org,
peterz@infradead.org, jpoimboe@kernel.org, jbaron@akamai.com,
rostedt@goodmis.org, ardb@kernel.org,
rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Cc: "Mukesh Kumar Chaurasiya (IBM)" <mkchauras@gmail.com>
Subject: [PATCH V4 1/3] powerpc/jump_label: adjust inline asm to be consistent
Date: Mon, 9 Feb 2026 16:24:54 +0530 [thread overview]
Message-ID: <20260209105456.1551677-2-mkchauras@gmail.com> (raw)
In-Reply-To: <20260209105456.1551677-1-mkchauras@gmail.com>
Added support for a new macro ARCH_STATIC_BRANCH_ASM in powerpc
to avoid duplication of inline asm between C and Rust. This is
inline with commit aecaf181651c '("jump_label: adjust inline asm to be consistent")'
Co-developed-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Signed-off-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
---
arch/powerpc/include/asm/jump_label.h | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/arch/powerpc/include/asm/jump_label.h b/arch/powerpc/include/asm/jump_label.h
index d4eaba459a0e..a6b211502bfe 100644
--- a/arch/powerpc/include/asm/jump_label.h
+++ b/arch/powerpc/include/asm/jump_label.h
@@ -15,14 +15,20 @@
#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG)
#define JUMP_LABEL_NOP_SIZE 4
+#define JUMP_TABLE_ENTRY(key, label) \
+ ".pushsection __jump_table, \"aw\" \n\t" \
+ ".long 1b - ., " label " - . \n\t" \
+ JUMP_ENTRY_TYPE key " - . \n\t" \
+ ".popsection \n\t"
+
+#define ARCH_STATIC_BRANCH_ASM(key, label) \
+ "1: nop \n\t" \
+ JUMP_TABLE_ENTRY(key,label)
+
static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
- asm goto("1:\n\t"
- "nop # arch_static_branch\n\t"
- ".pushsection __jump_table, \"aw\"\n\t"
- ".long 1b - ., %l[l_yes] - .\n\t"
- JUMP_ENTRY_TYPE "%c0 - .\n\t"
- ".popsection \n\t"
+ asm goto(
+ ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]")
: : "i" (&((char *)key)[branch]) : : l_yes);
return false;
@@ -34,10 +40,7 @@ static __always_inline bool arch_static_branch_jump(struct static_key *key, bool
{
asm goto("1:\n\t"
"b %l[l_yes] # arch_static_branch_jump\n\t"
- ".pushsection __jump_table, \"aw\"\n\t"
- ".long 1b - ., %l[l_yes] - .\n\t"
- JUMP_ENTRY_TYPE "%c0 - .\n\t"
- ".popsection \n\t"
+ JUMP_TABLE_ENTRY("%c0", "%l[l_yes]")
: : "i" (&((char *)key)[branch]) : : l_yes);
return false;
--
2.53.0
next prev parent reply other threads:[~2026-02-09 10:55 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-09 10:54 [PATCH V4 0/3] Rust support for powerpc Mukesh Kumar Chaurasiya (IBM)
2026-02-09 10:54 ` Mukesh Kumar Chaurasiya (IBM) [this message]
2026-02-09 10:54 ` [PATCH V4 2/3] rust: Add PowerPC support Mukesh Kumar Chaurasiya (IBM)
2026-02-09 12:02 ` Miguel Ojeda
2026-02-09 12:29 ` Christophe Leroy (CS GROUP)
2026-02-09 12:48 ` Miguel Ojeda
2026-02-10 5:27 ` Mukesh Kumar Chaurasiya
2026-02-10 9:17 ` Miguel Ojeda
2026-02-10 9:42 ` Link Mauve
2026-02-10 9:53 ` Miguel Ojeda
2026-02-10 5:11 ` kernel test robot
2026-02-09 10:54 ` [PATCH V4 3/3] powerpc: Enable Rust for ppc64le Mukesh Kumar Chaurasiya (IBM)
2026-02-09 11:52 ` Miguel Ojeda
2026-02-10 5:29 ` Mukesh Kumar Chaurasiya
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