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| author | Nicholas Piggin <npiggin@gmail.com> | 2023-03-25 15:29:01 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-04-11 16:13:33 +0300 |
| commit | eed7c420aac7fde5e5915d2747c3ebbbda225835 (patch) | |
| tree | 8e29bf90b55ef02b7a06dcad15135363210ae863 /arch/powerpc/include/asm/thread_info.h | |
| parent | 5088a6246bd3dcfea504376f356683f750136f7f (diff) | |
| download | linux-eed7c420aac7fde5e5915d2747c3ebbbda225835.tar.xz | |
powerpc: copy_thread differentiate kthreads and user mode threads
When copy_thread is given a kernel function to run in arg->fn, this
does not necessarily mean it is a kernel thread. User threads can be
created this way (e.g., kernel_init, see also x86's copy_thread()).
These threads run a kernel function which may call kernel_execve()
and return, which returns like a userspace exec(2) syscall.
Kernel threads are to be differentiated with PF_KTHREAD, will always
have arg->fn set, and should never return from that function, instead
calling kthread_exit() to exit.
Create separate paths for the kthread and user kernel thread creation
logic. The kthread path will never exit and does not require a user
interrupt frame, so it gets a minimal stack frame.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230325122904.2375060-6-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm/thread_info.h')
| -rw-r--r-- | arch/powerpc/include/asm/thread_info.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index cf13d84c4eb9..bf5dde1a4114 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -176,9 +176,11 @@ static inline bool test_thread_local_flags(unsigned int flags) #ifdef CONFIG_COMPAT #define is_32bit_task() (test_thread_flag(TIF_32BIT)) #define is_tsk_32bit_task(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT)) +#define clear_tsk_compat_task(tsk) (clear_tsk_thread_flag(p, TIF_32BIT)) #else #define is_32bit_task() (IS_ENABLED(CONFIG_PPC32)) #define is_tsk_32bit_task(tsk) (IS_ENABLED(CONFIG_PPC32)) +#define clear_tsk_compat_task(tsk) do { } while (0) #endif #if defined(CONFIG_PPC64) |