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Revert "task_work: Add TWA_NMI_CURRENT as an additional notify mode."

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This reverts commit 380681a290 which is
commit 466e4d801c upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I8e93a09f197a1fab89310989e3d80085ed330f45
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman 2024-12-02 16:20:45 +00:00
parent fb1b396b69
commit 4851a6d9c0
2 changed files with 3 additions and 22 deletions
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1
include/linux/task_work.h
View File

@ -18,7 +18,6 @@ enum task_work_notify_mode {
TWA_RESUME,
TWA_SIGNAL,
TWA_SIGNAL_NO_IPI,
TWA_NMI_CURRENT,
};
static inline bool task_work_pending(struct task_struct *task)

24
kernel/task_work.c
View File

@ -1,18 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/irq_work.h>
#include <linux/spinlock.h>
#include <linux/task_work.h>
#include <linux/resume_user_mode.h>
static struct callback_head work_exited; /* all we need is ->next == NULL */
static void task_work_set_notify_irq(struct irq_work *entry)
{
test_and_set_tsk_thread_flag(current, TIF_NOTIFY_RESUME);
}
static DEFINE_PER_CPU(struct irq_work, irq_work_NMI_resume) =
IRQ_WORK_INIT_HARD(task_work_set_notify_irq);
/**
* task_work_add - ask the @task to execute @work->func()
* @task: the task which should run the callback
@ -20,7 +12,7 @@ static DEFINE_PER_CPU(struct irq_work, irq_work_NMI_resume) =
* @notify: how to notify the targeted task
*
* Queue @work for task_work_run() below and notify the @task if @notify
* is @TWA_RESUME, @TWA_SIGNAL, @TWA_SIGNAL_NO_IPI or @TWA_NMI_CURRENT.
* is @TWA_RESUME, @TWA_SIGNAL, or @TWA_SIGNAL_NO_IPI.
*
* @TWA_SIGNAL works like signals, in that the it will interrupt the targeted
* task and run the task_work, regardless of whether the task is currently
@ -32,8 +24,6 @@ static DEFINE_PER_CPU(struct irq_work, irq_work_NMI_resume) =
* kernel anyway.
* @TWA_RESUME work is run only when the task exits the kernel and returns to
* user mode, or before entering guest mode.
* @TWA_NMI_CURRENT works like @TWA_RESUME, except it can only be used for the
* current @task and if the current context is NMI.
*
* Fails if the @task is exiting/exited and thus it can't process this @work.
* Otherwise @work->func() will be called when the @task goes through one of
@ -54,13 +44,8 @@ int task_work_add(struct task_struct *task, struct callback_head *work,
{
struct callback_head *head;
if (notify == TWA_NMI_CURRENT) {
if (WARN_ON_ONCE(task != current))
return -EINVAL;
} else {
/* record the work call stack in order to print it in KASAN reports */
kasan_record_aux_stack(work);
}
/* record the work call stack in order to print it in KASAN reports */
kasan_record_aux_stack(work);
head = READ_ONCE(task->task_works);
do {
@ -81,9 +66,6 @@ int task_work_add(struct task_struct *task, struct callback_head *work,
case TWA_SIGNAL_NO_IPI:
__set_notify_signal(task);
break;
case TWA_NMI_CURRENT:
irq_work_queue(this_cpu_ptr(&irq_work_NMI_resume));
break;
default:
WARN_ON_ONCE(1);
break;