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| author | Andy Lutomirski <luto@kernel.org> | 2016-09-15 22:45:43 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-21 10:35:04 +0100 |
| commit | 002cc9ee358bfeb21490830b6ba34ba217ef22eb (patch) | |
| tree | ada846dc3b566d993086a7713462541fd996814e /init | |
| parent | 1354c2fa639636e3b83a736fb29eb449477c64f9 (diff) | |
| download | linux-rt-002cc9ee358bfeb21490830b6ba34ba217ef22eb.tar.gz | |
sched/core: Add try_get_task_stack() and put_task_stack()
commit c6c314a613cd7d03fb97713e0d642b493de42e69 upstream.
There are a few places in the kernel that access stack memory
belonging to a different task. Before we can start freeing task
stacks before the task_struct is freed, we need a way for those code
paths to pin the stack.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jann Horn <jann@thejh.net>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/17a434f50ad3d77000104f21666575e10a9c1fbd.1474003868.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index 5dec7d424980..f9fb621c9562 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -33,6 +33,9 @@ config THREAD_INFO_IN_TASK make this work, an arch will need to remove all thread_info fields except flags and fix any runtime bugs. + One subtle change that will be needed is to use try_get_task_stack() + and put_task_stack() in save_thread_stack_tsk() and get_wchan(). + menu "General setup" config BROKEN |