https://bugzilla.kernel.org/show_bug.cgi?id=214661

            Bug ID: 214661
           Summary: THREAD_SIZE on x86_64 is 4*PAGE_SIZE, not 2*PAGE_SIZE
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
          Assignee: documentation_man-pages@kernel-bugs.osdl.org
          Reporter: me@ieevee.com
        Regression: No

According to '/root/linux/arch/x86/include/asm/page_64_types.h', THREAD_SIZE on
x86_64 now is 4*PAGE_SIZE:

#ifdef CONFIG_KASAN
#define KASAN_STACK_ORDER 1
#else
#define KASAN_STACK_ORDER 0
#endif

#define THREAD_SIZE_ORDER       (2 + KASAN_STACK_ORDER)
#define THREAD_SIZE  (PAGE_SIZE << THREAD_SIZE_ORDER)

However, the Documentation/x86/kernel-stacks.rst shows that THREAD_SIZE on
x86_64 is 2*PAGE_SIZE:

Like all other architectures, x86_64 has a kernel stack for every
active thread.  These thread stacks are THREAD_SIZE (2*PAGE_SIZE) big.

I am not quite sure which is correct, Maybe the document needs an upgrade?
Thanks a lot for any reply.

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