Re: [PATCH v24 18/30] mm/mmap: Add shadow stack pages to memory accounting

Account shadow stack pages to stack memory.

Signed-off-by: Yu-cheng Yu <redacted>
Cc: Kees Cook <redacted>
Cc: Kirill A. Shutemov <redacted>
---
v24:
- Change arch_shadow_stack_mapping() to is_shadow_stack_mapping().
- Change VM_SHSTK to VM_SHADOW_STACK.

 arch/x86/mm/pgtable.c   |  7 +++++++
 include/linux/pgtable.h | 11 +++++++++++
 mm/mmap.c               |  5 +++++
 3 files changed, 23 insertions(+)

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index e778dbbef3d8..212a8c1fe5ba 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c

@@ -897,3 +897,10 @@ int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
 
 #endif /* CONFIG_X86_64 */
 #endif	/* CONFIG_HAVE_ARCH_HUGE_VMAP */
+
+#ifdef CONFIG_ARCH_HAS_SHADOW_STACK
+bool is_shadow_stack_mapping(vm_flags_t vm_flags)
+{
+	return (vm_flags & VM_SHADOW_STACK);
+}