add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/kernel/fork.c
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@@ -42,6 +42,7 @@
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 #include <linux/hmm.h>
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 #include <linux/fs.h>
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 #include <linux/mm.h>
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+#include <linux/kprobes.h>
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 #include <linux/vmacache.h>
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 #include <linux/nsproxy.h>
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 #include <linux/capability.h>
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@@ -649,6 +650,19 @@
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 }
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 EXPORT_SYMBOL_GPL(__mmdrop);
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+/*
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+ * RCU callback for delayed mm drop. Not strictly rcu, but we don't
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+ * want another facility to make this work.
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+ */
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+void __mmdrop_delayed(struct rcu_head *rhp)
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+{
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+	struct mm_struct *mm = container_of(rhp, struct mm_struct, delayed_drop);
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+
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+	__mmdrop(mm);
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+}
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+#endif
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+
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 static void mmdrop_async_fn(struct work_struct *work)
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 {
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 	struct mm_struct *mm;
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@@ -683,12 +697,23 @@
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 	if (atomic_dec_and_test(&sig->sigcnt))
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 		free_signal_struct(sig);
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 }
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-
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+static
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+#endif
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 void __put_task_struct(struct task_struct *tsk)
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 {
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 	WARN_ON(!tsk->exit_state);
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 	WARN_ON(atomic_read(&tsk->usage));
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 	WARN_ON(tsk == current);
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+
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+	/*
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+	 * Remove function-return probe instances associated with this
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+	 * task and put them back on the free list.
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+	 */
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+	kprobe_flush_task(tsk);
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+
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+	/* Task is done with its stack. */
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+	put_task_stack(tsk);
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 	cgroup_free(tsk);
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 	task_numa_free(tsk, true);
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@@ -700,7 +725,18 @@
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 	if (!profile_handoff_task(tsk))
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 		free_task(tsk);
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 }
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+#ifndef CONFIG_PREEMPT_RT_BASE
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 EXPORT_SYMBOL_GPL(__put_task_struct);
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+#else
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+void __put_task_struct_cb(struct rcu_head *rhp)
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+{
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+	struct task_struct *tsk = container_of(rhp, struct task_struct, put_rcu);
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+
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+	__put_task_struct(tsk);
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+
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+}
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+EXPORT_SYMBOL_GPL(__put_task_struct_cb);
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+#endif
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 void __init __weak arch_task_cache_init(void) { }
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@@ -863,6 +899,8 @@
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 #ifdef CONFIG_STACKPROTECTOR
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 	tsk->stack_canary = get_random_canary();
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 #endif
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+	if (orig->cpus_ptr == &orig->cpus_mask)
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+		tsk->cpus_ptr = &tsk->cpus_mask;
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904
 
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 	/*
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 	 * One for us, one for whoever does the "release_task()" (usually
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@@ -875,6 +913,7 @@
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 	tsk->splice_pipe = NULL;
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 	tsk->task_frag.page = NULL;
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 	tsk->wake_q.next = NULL;
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+	tsk->wake_q_sleeper.next = NULL;
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 	account_kernel_stack(tsk, 1);
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@@ -1600,6 +1639,9 @@
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  */
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 static void posix_cpu_timers_init(struct task_struct *tsk)
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 {
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+	tsk->posix_timer_list = NULL;
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+#endif
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 	tsk->cputime_expires.prof_exp = 0;
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 	tsk->cputime_expires.virt_exp = 0;
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 	tsk->cputime_expires.sched_exp = 0;
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@@ -1915,6 +1957,7 @@
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 	spin_lock_init(&p->alloc_lock);
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 	init_sigpending(&p->pending);
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+	p->sigqueue_cache = NULL;
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 	p->utime = p->stime = p->gtime = 0;
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 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME