From: Jann Horn <jannh@google.com>
To: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Arve Hjønnevåg" <arve@android.com>,
"Todd Kjos" <tkjos@android.com>,
"Martijn Coenen" <maco@android.com>,
"Joel Fernandes" <joel@joelfernandes.org>,
"Christian Brauner" <christian@brauner.io>,
jannh@google.com
Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org
Subject: [PATCH] binder: Remove incorrect comment about vm_insert_page() behavior
Date: Fri, 18 Oct 2019 17:39:46 +0200 [thread overview]
Message-ID: <20191018153946.128584-1-jannh@google.com> (raw)
vm_insert_page() does increment the page refcount, and just to be sure,
I've confirmed it by printing page_count(page[0].page_ptr) before and after
vm_insert_page(). It's 1 before, 2 afterwards, as expected.
Signed-off-by: Jann Horn <jannh@google.com>
---
drivers/android/binder_alloc.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index d42a8b2f636a..2faada3e97fd 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -267,7 +267,6 @@ static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
alloc->pages_high = index + 1;
trace_binder_alloc_page_end(alloc, index);
- /* vm_insert_page does not seem to increment the refcount */
}
if (mm) {
up_read(&mm->mmap_sem);
--
2.23.0.866.gb869b98d4c-goog
next reply other threads:[~2019-10-18 15:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-18 15:39 Jann Horn [this message]
2019-10-18 15:47 ` [PATCH] binder: Remove incorrect comment about vm_insert_page() behavior Christian Brauner
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