From: Khalid Aziz <khalid@xxxxxxxxxx>
An mshare region contains zero or more actual vmas that map objects
in the mshare range with shared page tables.
Signed-off-by: Khalid Aziz <khalid@xxxxxxxxxx>
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Anthony Yznaga <anthony.yznaga@xxxxxxxxxx>
---
include/linux/mm.h | 19 +++++++++++++++++++
include/trace/events/mmflags.h | 7 +++++++
2 files changed, 26 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 76ee2bfaa8bd..aca853b4c5dc 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -431,6 +431,13 @@ extern unsigned int kobjsize(const void *objp);
#define VM_SEALED VM_NONE
#endif
+#ifdef CONFIG_MSHARE
+#define VM_MSHARE_BIT 43
+#define VM_MSHARE BIT(VM_MSHARE_BIT)
+#else
+#define VM_MSHARE VM_NONE
+#endif
+
/* Bits set in the VMA until the stack is in its final location */
#define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ | VM_STACK_EARLY)
@@ -991,6 +998,18 @@ static inline bool vma_is_anon_shmem(struct vm_area_struct *vma) { return false;
int vma_is_stack_for_current(struct vm_area_struct *vma);
+#ifdef CONFIG_MSHARE
+static inline bool vma_is_mshare(const struct vm_area_struct *vma)
+{
+ return vma->vm_flags & VM_MSHARE;
+}
+#else
+static inline bool vma_is_mshare(const struct vm_area_struct *vma)
+{
+ return false;
+}
+#endif
+
/* flush_tlb_range() takes a vma, not a mm, and can care about flags */
#define TLB_FLUSH_VMA(mm,flags) { .vm_mm = (mm), .vm_flags = (flags) }
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index aa441f593e9a..a9b13a8513d0 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -200,6 +200,12 @@ IF_HAVE_PG_ARCH_3(arch_3)
# define IF_HAVE_VM_DROPPABLE(flag, name)
#endif
+#ifdef CONFIG_MSHARE
+# define IF_HAVE_VM_MSHARE(flag, name) {flag, name},
+#else
+# define IF_HAVE_VM_MSHARE(flag, name)
+#endif
+
#define __def_vmaflag_names \
{VM_READ, "read" }, \
{VM_WRITE, "write" }, \
@@ -233,6 +239,7 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY, "softdirty" ) \
{VM_HUGEPAGE, "hugepage" }, \
{VM_NOHUGEPAGE, "nohugepage" }, \
IF_HAVE_VM_DROPPABLE(VM_DROPPABLE, "droppable" ) \
+IF_HAVE_VM_MSHARE(VM_MSHARE, "mshare" ) \
{VM_MERGEABLE, "mergeable" } \
#define show_vma_flags(flags) \
--
2.47.1
