diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2025-10-27 09:45:08 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-11-04 08:33:33 +0100 |
| commit | 0f085b41880e3140efa6941ff2b8fd43bac4d659 (patch) | |
| tree | 441ac375157092ba3b346b5f661acbddda7185dd /include/linux/sched.h | |
| parent | eaa9088d568c84afd72fa32dbe01833aef861d0d (diff) | |
rseq: Provide and use rseq_set_ids()
Provide a new and straight forward implementation to set the IDs (CPU ID,
Node ID and MM CID), which can be later inlined into the fast path.
It does all operations in one scoped_user_rw_access() section and retrieves
also the critical section member (rseq::cs_rseq) from user space to avoid
another user..begin/end() pair. This is in preparation for optimizing the
fast path to avoid extra work when not required.
On rseq registration set the CPU ID fields to RSEQ_CPU_ID_UNINITIALIZED and
node and MM CID to zero. That's the same as the kernel internal reset
values. That makes the debug validation in the exit code work correctly on
the first exit to user space.
Use it to replace the whole related zoo in rseq.c
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/20251027084307.393972266@linutronix.de
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 24a9da7ca3e7..e47abc8685d7 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -42,7 +42,6 @@ #include <linux/posix-timers_types.h> #include <linux/restart_block.h> #include <linux/rseq_types.h> -#include <uapi/linux/rseq.h> #include <linux/seqlock_types.h> #include <linux/kcsan.h> #include <linux/rv.h> @@ -1408,15 +1407,6 @@ struct task_struct { #endif /* CONFIG_NUMA_BALANCING */ struct rseq_data rseq; -#ifdef CONFIG_DEBUG_RSEQ - /* - * This is a place holder to save a copy of the rseq fields for - * validation of read-only fields. The struct rseq has a - * variable-length array at the end, so it cannot be used - * directly. Reserve a size large enough for the known fields. - */ - char rseq_fields[sizeof(struct rseq)]; -#endif #ifdef CONFIG_SCHED_MM_CID int mm_cid; /* Current cid in mm */ |