VM_HUGETLB_HGM indicates that a HugeTLB VMA may contain high-granularity
mappings. Its VmFlags string is "hm".
Signed-off-by: James Houghton <jthoughton@xxxxxxxxxx>
---
fs/proc/task_mmu.c | 3 +++
include/linux/mm.h | 7 +++++++
include/trace/events/mmflags.h | 7 +++++++
3 files changed, 17 insertions(+)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index e35a0398db63..41b5509bde0e 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -711,6 +711,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR
[ilog2(VM_UFFD_MINOR)] = "ui",
#endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
+#ifdef CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING
+ [ilog2(VM_HUGETLB_HGM)] = "hm",
+#endif /* CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING */
};
size_t i;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index c37f9330f14e..738b3605f80e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -372,6 +372,13 @@ extern unsigned int kobjsize(const void *objp);
# define VM_UFFD_MINOR VM_NONE
#endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
+#ifdef CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING
+# define VM_HUGETLB_HGM_BIT 38
+# define VM_HUGETLB_HGM BIT(VM_HUGETLB_HGM_BIT) /* HugeTLB high-granularity mapping */
+#else /* !CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING */
+# define VM_HUGETLB_HGM VM_NONE
+#endif /* CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING */
+
/* Bits set in the VMA until the stack is in its final location */
#define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index 412b5a46374c..88ce04b2ff69 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -163,6 +163,12 @@ IF_HAVE_PG_SKIP_KASAN_POISON(PG_skip_kasan_poison, "skip_kasan_poison")
# define IF_HAVE_UFFD_MINOR(flag, name)
#endif
+#ifdef CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING
+# define IF_HAVE_HUGETLB_HGM(flag, name) {flag, name},
+#else
+# define IF_HAVE_HUGETLB_HGM(flag, name)
+#endif
+
#define __def_vmaflag_names \
{VM_READ, "read" }, \
{VM_WRITE, "write" }, \
@@ -187,6 +193,7 @@ IF_HAVE_UFFD_MINOR(VM_UFFD_MINOR, "uffd_minor" ) \
{VM_ACCOUNT, "account" }, \
{VM_NORESERVE, "noreserve" }, \
{VM_HUGETLB, "hugetlb" }, \
+IF_HAVE_HUGETLB_HGM(VM_HUGETLB_HGM, "hugetlb_hgm" ) \
{VM_SYNC, "sync" }, \
__VM_ARCH_SPECIFIC_1 , \
{VM_WIPEONFORK, "wipeonfork" }, \
--
2.39.0.314.g84b9a713c41-goog
