Merge branch 'for-6.15/amd_sfh' into for-linus

From: Mario Limonciello <mario.limonciello@amd.com>

Some platforms include a human presence detection (HPD) sensor. When
enabled and a user is detected a wake event will be emitted from the
sensor fusion hub that software can react to.

Example use cases are "wake from suspend on approach" or to "lock
when leaving".

This is currently enabled by default on supported systems, but users
can't control it. This essentially means that wake on approach is
enabled which is a really surprising behavior to users that don't
expect it.

Instead of defaulting to enabled add a sysfs knob that users can
use to enable the feature if desirable and set it to disabled by
default.

1 files changed, 17 insertions, 0 deletions

diff --git a/mm/util.c b/mm/util.c
index 60aa40f612b87..b6b9684a14388 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -582,6 +582,23 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
 	return ret;
 }
 
+/*
+ * Perform a userland memory mapping into the current process address space. See
+ * the comment for do_mmap() for more details on this operation in general.
+ *
+ * This differs from do_mmap() in that:
+ *
+ * a. An offset parameter is provided rather than pgoff, which is both checked
+ *    for overflow and page alignment.
+ * b. mmap locking is performed on the caller's behalf.
+ * c. Userfaultfd unmap events and memory population are handled.
+ *
+ * This means that this function performs essentially the same work as if
+ * userland were invoking mmap (2).
+ *
+ * Returns either an error, or the address at which the requested mapping has
+ * been performed.
+ */
 unsigned long vm_mmap(struct file *file, unsigned long addr,
 	unsigned long len, unsigned long prot,
 	unsigned long flag, unsigned long offset)