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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Dmitry Safonov <dsafonov@virtuozzo.com>,
	Cyrill Gorcunov <gorcunov@openvz.org>,
	Borislav Petkov <bp@suse.de>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv5 11/19] x86/mm: Make STACK_TOP_MAX dynamic
Date: Mon, 21 Aug 2017 18:29:08 +0300	[thread overview]
Message-ID: <20170821152916.40124-12-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20170821152916.40124-1-kirill.shutemov@linux.intel.com>

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@linux.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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  parent reply	other threads:[~2017-08-21 15:29 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-21 15:28 [PATCHv5 00/19] Boot-time switching between 4- and 5-level paging Kirill A. Shutemov
2017-08-21 15:28 ` [PATCHv5 01/19] mm/sparsemem: Allocate mem_section at runtime for SPARSEMEM_EXTREME Kirill A. Shutemov
2017-08-22 16:28   ` Borislav Petkov
2017-08-22 17:50     ` Kirill A. Shutemov
2017-08-21 15:28 ` [PATCHv5 02/19] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 03/19] x86/kasan: Use the same shadow offset for 4- and 5-level paging Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 04/19] x86/xen: Provide pre-built page tables only for XEN_PV and XEN_PVH Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 05/19] x86/xen: Drop 5-level paging support code from XEN_PV code Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 06/19] x86/boot/compressed/64: Detect and handle 5-level paging at boot-time Kirill A. Shutemov
2017-08-27 11:29   ` Cyrill Gorcunov
2017-09-04 13:02     ` Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 07/19] x86/mm: Make virtual memory layout movable for CONFIG_X86_5LEVEL Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 08/19] x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 09/19] x86/mm: Make MAX_PHYSADDR_BITS and MAX_PHYSMEM_BITS dynamic Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 10/19] x86/mm: Make __PHYSICAL_MASK_SHIFT and __VIRTUAL_MASK_SHIFT dynamic Kirill A. Shutemov
2017-08-21 15:29 ` Kirill A. Shutemov [this message]
2017-08-21 15:29 ` [PATCHv5 12/19] x86/mm: Adjust virtual address space layout in early boot Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 13/19] x86/mm: Make early boot code support boot-time switching of paging modes Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 14/19] x86/mm: Fold p4d page table layer at runtime Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 15/19] x86/mm: Replace compile-time checks for 5-level with runtime-time Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 16/19] x86/mm: Allow to boot without la57 if CONFIG_X86_5LEVEL=y Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 17/19] x86/xen: Allow XEN_PV and XEN_PVH to be enabled with X86_5LEVEL Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 18/19] x86/mm: Redefine some of page table helpers as macros Kirill A. Shutemov
2017-08-21 15:29 ` [PATCHv5 19/19] x86/mm: Offset boot-time paging mode switching cost Kirill A. Shutemov

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