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rseq: Provide tracepoint wrappers for inline code

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Provide tracepoint wrappers for the upcoming RSEQ exit to user space inline
fast path, so that the header can be safely included by code which defines
actual trace points.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://patch.msgid.link/20251027084306.967114316@linutronix.de
This commit is contained in:
Thomas Gleixner 2025-10-27 09:44:50 +01:00 committed by Ingo Molnar
parent 2fc0e4b412
commit dab344753e
2 changed files with 46 additions and 1 deletions
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28
include/linux/rseq_entry.h
View File

@ -5,6 +5,34 @@
#ifdef CONFIG_RSEQ
#include <linux/rseq.h>
#include <linux/tracepoint-defs.h>
#ifdef CONFIG_TRACEPOINTS
DECLARE_TRACEPOINT(rseq_update);
DECLARE_TRACEPOINT(rseq_ip_fixup);
void __rseq_trace_update(struct task_struct *t);
void __rseq_trace_ip_fixup(unsigned long ip, unsigned long start_ip,
unsigned long offset, unsigned long abort_ip);
static inline void rseq_trace_update(struct task_struct *t, struct rseq_ids *ids)
{
if (tracepoint_enabled(rseq_update) && ids)
__rseq_trace_update(t);
}
static inline void rseq_trace_ip_fixup(unsigned long ip, unsigned long start_ip,
unsigned long offset, unsigned long abort_ip)
{
if (tracepoint_enabled(rseq_ip_fixup))
__rseq_trace_ip_fixup(ip, start_ip, offset, abort_ip);
}
#else /* CONFIG_TRACEPOINT */
static inline void rseq_trace_update(struct task_struct *t, struct rseq_ids *ids) { }
static inline void rseq_trace_ip_fixup(unsigned long ip, unsigned long start_ip,
unsigned long offset, unsigned long abort_ip) { }
#endif /* !CONFIG_TRACEPOINT */
static __always_inline void rseq_note_user_irq_entry(void)
{
if (IS_ENABLED(CONFIG_GENERIC_IRQ_ENTRY))

19
kernel/rseq.c
View File

@ -70,7 +70,7 @@
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <linux/syscalls.h>
#include <linux/rseq.h>
#include <linux/rseq_entry.h>
#include <linux/types.h>
#include <linux/ratelimit.h>
#include <asm/ptrace.h>
@ -91,6 +91,23 @@
RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL | \
RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE)
#ifdef CONFIG_TRACEPOINTS
/*
* Out of line, so the actual update functions can be in a header to be
* inlined into the exit to user code.
*/
void __rseq_trace_update(struct task_struct *t)
{
trace_rseq_update(t);
}
void __rseq_trace_ip_fixup(unsigned long ip, unsigned long start_ip,
unsigned long offset, unsigned long abort_ip)
{
trace_rseq_ip_fixup(ip, start_ip, offset, abort_ip);
}
#endif /* CONFIG_TRACEPOINTS */
#ifdef CONFIG_DEBUG_RSEQ
static struct rseq *rseq_kernel_fields(struct task_struct *t)
{