[tip: perf/core] perf: Eliminate duplicate arch-specific function definitions
From: tip-bot2 for Dapeng Mi
Date: Tue Sep 08 2026 - 17:02:50 EST
The following commit has been merged into the perf/core branch of tip:
Commit-ID: cb388bd530cc518b0e245fb4eabc40f3de538e4f
Gitweb: https://git.kernel.org/tip/cb388bd530cc518b0e245fb4eabc40f3de538e4f
Author: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
AuthorDate: Mon, 24 Aug 2026 16:27:12 +08:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 02 Sep 2026 13:10:40 +02:00
perf: Eliminate duplicate arch-specific function definitions
Define default common __weak functions for perf_reg_value(),
perf_reg_validate(), perf_reg_abi() and perf_get_regs_user(). This helps
to eliminate the duplicated arch-specific definitions.
No function changes intended.
Signed-off-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20260824082731.1013973-5-dapeng1.mi@xxxxxxxxxxxxxxx
---
arch/arm/kernel/perf_regs.c | 6 +------
arch/arm64/kernel/perf_regs.c | 6 +------
arch/csky/kernel/perf_regs.c | 6 +------
arch/loongarch/kernel/perf_regs.c | 6 +------
arch/mips/kernel/perf_regs.c | 6 +------
arch/parisc/kernel/perf_regs.c | 6 +------
arch/riscv/kernel/perf_regs.c | 6 +------
arch/x86/kernel/perf_regs.c | 6 +------
include/linux/perf_regs.h | 32 +++++-------------------------
kernel/events/core.c | 22 +++++++++++++++++++++-
10 files changed, 28 insertions(+), 74 deletions(-)
diff --git a/arch/arm/kernel/perf_regs.c b/arch/arm/kernel/perf_regs.c
index 0529f90..d575a4c 100644
--- a/arch/arm/kernel/perf_regs.c
+++ b/arch/arm/kernel/perf_regs.c
@@ -31,9 +31,3 @@ u64 perf_reg_abi(struct task_struct *task)
return PERF_SAMPLE_REGS_ABI_32;
}
-void perf_get_regs_user(struct perf_regs *regs_user,
- struct pt_regs *regs)
-{
- regs_user->regs = task_pt_regs(current);
- regs_user->abi = perf_reg_abi(current);
-}
diff --git a/arch/arm64/kernel/perf_regs.c b/arch/arm64/kernel/perf_regs.c
index b4eece3..70e2f13 100644
--- a/arch/arm64/kernel/perf_regs.c
+++ b/arch/arm64/kernel/perf_regs.c
@@ -98,9 +98,3 @@ u64 perf_reg_abi(struct task_struct *task)
return PERF_SAMPLE_REGS_ABI_64;
}
-void perf_get_regs_user(struct perf_regs *regs_user,
- struct pt_regs *regs)
-{
- regs_user->regs = task_pt_regs(current);
- regs_user->abi = perf_reg_abi(current);
-}
diff --git a/arch/csky/kernel/perf_regs.c b/arch/csky/kernel/perf_regs.c
index 09b7f88..94601f3 100644
--- a/arch/csky/kernel/perf_regs.c
+++ b/arch/csky/kernel/perf_regs.c
@@ -31,9 +31,3 @@ u64 perf_reg_abi(struct task_struct *task)
return PERF_SAMPLE_REGS_ABI_32;
}
-void perf_get_regs_user(struct perf_regs *regs_user,
- struct pt_regs *regs)
-{
- regs_user->regs = task_pt_regs(current);
- regs_user->abi = perf_reg_abi(current);
-}
diff --git a/arch/loongarch/kernel/perf_regs.c b/arch/loongarch/kernel/perf_regs.c
index 263ac4a..8dd604f 100644
--- a/arch/loongarch/kernel/perf_regs.c
+++ b/arch/loongarch/kernel/perf_regs.c
@@ -45,9 +45,3 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
return regs->regs[idx];
}
-void perf_get_regs_user(struct perf_regs *regs_user,
- struct pt_regs *regs)
-{
- regs_user->regs = task_pt_regs(current);
- regs_user->abi = perf_reg_abi(current);
-}
diff --git a/arch/mips/kernel/perf_regs.c b/arch/mips/kernel/perf_regs.c
index e686780..7736d3c 100644
--- a/arch/mips/kernel/perf_regs.c
+++ b/arch/mips/kernel/perf_regs.c
@@ -60,9 +60,3 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
return (s64)v; /* Sign extend if 32-bit. */
}
-void perf_get_regs_user(struct perf_regs *regs_user,
- struct pt_regs *regs)
-{
- regs_user->regs = task_pt_regs(current);
- regs_user->abi = perf_reg_abi(current);
-}
diff --git a/arch/parisc/kernel/perf_regs.c b/arch/parisc/kernel/perf_regs.c
index 10a1a5f..b9fe1f2 100644
--- a/arch/parisc/kernel/perf_regs.c
+++ b/arch/parisc/kernel/perf_regs.c
@@ -53,9 +53,3 @@ u64 perf_reg_abi(struct task_struct *task)
return PERF_SAMPLE_REGS_ABI_64;
}
-void perf_get_regs_user(struct perf_regs *regs_user,
- struct pt_regs *regs)
-{
- regs_user->regs = task_pt_regs(current);
- regs_user->abi = perf_reg_abi(current);
-}
diff --git a/arch/riscv/kernel/perf_regs.c b/arch/riscv/kernel/perf_regs.c
index fd304a2..3bba8de 100644
--- a/arch/riscv/kernel/perf_regs.c
+++ b/arch/riscv/kernel/perf_regs.c
@@ -35,9 +35,3 @@ u64 perf_reg_abi(struct task_struct *task)
#endif
}
-void perf_get_regs_user(struct perf_regs *regs_user,
- struct pt_regs *regs)
-{
- regs_user->regs = task_pt_regs(current);
- regs_user->abi = perf_reg_abi(current);
-}
diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c
index 624703a..81204cb 100644
--- a/arch/x86/kernel/perf_regs.c
+++ b/arch/x86/kernel/perf_regs.c
@@ -100,12 +100,6 @@ u64 perf_reg_abi(struct task_struct *task)
return PERF_SAMPLE_REGS_ABI_32;
}
-void perf_get_regs_user(struct perf_regs *regs_user,
- struct pt_regs *regs)
-{
- regs_user->regs = task_pt_regs(current);
- regs_user->abi = perf_reg_abi(current);
-}
#else /* CONFIG_X86_64 */
#define REG_NOSUPPORT ((1ULL << PERF_REG_X86_DS) | \
(1ULL << PERF_REG_X86_ES) | \
diff --git a/include/linux/perf_regs.h b/include/linux/perf_regs.h
index f632c57..144bcc3 100644
--- a/include/linux/perf_regs.h
+++ b/include/linux/perf_regs.h
@@ -9,6 +9,12 @@ struct perf_regs {
struct pt_regs *regs;
};
+u64 perf_reg_value(struct pt_regs *regs, int idx);
+int perf_reg_validate(u64 mask);
+u64 perf_reg_abi(struct task_struct *task);
+void perf_get_regs_user(struct perf_regs *regs_user,
+ struct pt_regs *regs);
+
#ifdef CONFIG_HAVE_PERF_REGS
#include <asm/perf_regs.h>
@@ -16,35 +22,9 @@ struct perf_regs {
#define PERF_REG_EXTENDED_MASK 0
#endif
-u64 perf_reg_value(struct pt_regs *regs, int idx);
-int perf_reg_validate(u64 mask);
-u64 perf_reg_abi(struct task_struct *task);
-void perf_get_regs_user(struct perf_regs *regs_user,
- struct pt_regs *regs);
#else
#define PERF_REG_EXTENDED_MASK 0
-static inline u64 perf_reg_value(struct pt_regs *regs, int idx)
-{
- return 0;
-}
-
-static inline int perf_reg_validate(u64 mask)
-{
- return mask ? -ENOSYS : 0;
-}
-
-static inline u64 perf_reg_abi(struct task_struct *task)
-{
- return PERF_SAMPLE_REGS_ABI_NONE;
-}
-
-static inline void perf_get_regs_user(struct perf_regs *regs_user,
- struct pt_regs *regs)
-{
- regs_user->regs = task_pt_regs(current);
- regs_user->abi = perf_reg_abi(current);
-}
#endif /* CONFIG_HAVE_PERF_REGS */
#endif /* _LINUX_PERF_REGS_H */
diff --git a/kernel/events/core.c b/kernel/events/core.c
index a6c8e38..c84340e 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7818,6 +7818,28 @@ unsigned long perf_instruction_pointer(struct perf_event *event,
0 : perf_arch_instruction_pointer(regs);
}
+u64 __weak perf_reg_value(struct pt_regs *regs, int idx)
+{
+ return 0;
+}
+
+int __weak perf_reg_validate(u64 mask)
+{
+ return mask ? -ENOSYS : 0;
+}
+
+u64 __weak perf_reg_abi(struct task_struct *task)
+{
+ return PERF_SAMPLE_REGS_ABI_NONE;
+}
+
+void __weak perf_get_regs_user(struct perf_regs *regs_user,
+ struct pt_regs *regs)
+{
+ regs_user->regs = task_pt_regs(current);
+ regs_user->abi = perf_reg_abi(current);
+}
+
static void
perf_output_sample_regs(struct perf_output_handle *handle,
struct pt_regs *regs, u64 mask)