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Subject[PATCH] Documentation/x86_64: Fix a thread stack size
current information about THREAD_SIZE value is obsoleted. This patch
fixes this.

Signed-off-by: Alexander Kuleshov <>
Documentation/x86/kernel-stacks | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/x86/kernel-stacks b/Documentation/x86/kernel-stacks
index 9a0aa4d..f4b4197 100644
--- a/Documentation/x86/kernel-stacks
+++ b/Documentation/x86/kernel-stacks
@@ -6,7 +6,8 @@ Most of the text from Keith Owens, hacked by AK
x86_64 page size (PAGE_SIZE) is 4K.

Like all other architectures, x86_64 has a kernel stack for every
-active thread. These thread stacks are THREAD_SIZE (2*PAGE_SIZE) big.
+active thread. These thread stacks are THREAD_SIZE (PAGE_SIZE << 2)
+or (PAGE_SIZE << 3) if the CONFIG_KASAN is enabled.
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.
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