Prior to kernel 4.9 the thread_info structure was at the bottom of
the kernel stack. kernel 4.9 moved it into the task_struct.
See commits c65eacb ("sched/core: Allow putting thread_info into
task_struct"), 15f4eae ("x86: Move thread_info into task_struct")
and 883d50f ("scripts/gdb: fix get_thread_info").
Signed-off-by: Mingzhe Yang <cainiao666999@xxxxxxxxx>
---
Documentation/x86/kernel-stacks.rst | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Documentation/x86/kernel-stacks.rst b/Documentation/x86/kernel-stacks.rst
index 6b0bcf0..e9097f3 100644
--- a/Documentation/x86/kernel-stacks.rst
+++ b/Documentation/x86/kernel-stacks.rst
@@ -15,7 +15,8 @@ Like all other architectures, x86_64 has a kernel stack for every
active thread. These thread stacks are THREAD_SIZE (2*PAGE_SIZE) big.
These stacks contain useful data as long as a thread is alive or a
zombie. While the thread is in user space the kernel stack is empty
-except for the thread_info structure at the bottom.
+except for the thread_info structure at the bottom (since kernel 4.9,
+the thread_info structure has been moved into task_struct).
In addition to the per thread stacks, there are specialized stacks
associated with each CPU. These stacks are only used while the kernel
--
1.8.3.1
