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Date: Mon, 21 Aug 2017 18:29:08 +0300 From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> To: Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Andy Lutomirski <luto@...capital.net>, Dmitry Safonov <dsafonov@...tuozzo.com>, Cyrill Gorcunov <gorcunov@...nvz.org>, Borislav Petkov <bp@...e.de>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> Subject: [PATCHv5 11/19] x86/mm: Make STACK_TOP_MAX dynamic For boot-time switching between paging modes, we need to be able to change STACK_TOP_MAX at runtime. The change is trivial and it doesn't affect kernel image size. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> --- arch/x86/include/asm/processor.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index c1352771b2f6..981cb956d8bf 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -871,7 +871,7 @@ static inline void spin_lock_prefetch(const void *x) IA32_PAGE_OFFSET : TASK_SIZE_MAX) #define STACK_TOP TASK_SIZE_LOW -#define STACK_TOP_MAX TASK_SIZE_MAX +#define STACK_TOP_MAX (pgtable_l5_enabled ? TASK_SIZE_MAX : DEFAULT_MAP_WINDOW) #define INIT_THREAD { \ .sp0 = TOP_OF_INIT_STACK, \ -- 2.14.1
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