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.
CC += LKML Hello, On 10/9/21 7:19 AM, bugzilla-daemon@bugzilla.kernel.org wrote: > 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 This is incorrect. The internal kernel documentation is not part of the man-pages. I checked to see if the manual pages need an update, but I couldn't find anything about THREAD_SIZE: alx@sqli:~/src/linux/man-pages$ grep -rn THREAD_SIZE alx@sqli:~/src/linux/man-pages$ I can't edit the component, so maybe you need to close the bug and open a new one in a different component. Anyway, thanks for the report! Alex > 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. >
Thanks for your reply!