1 files changed, 0 insertions, 39 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0455-Fix-copy_from_user-if-BCM2835_FAST_MEMCPY-n.patch b/target/linux/bcm27xx/patches-4.19/950-0455-Fix-copy_from_user-if-BCM2835_FAST_MEMCPY-n.patch
deleted file mode 100644
index b06b21404e..0000000000
--- a/target/linux/bcm27xx/patches-4.19/950-0455-Fix-copy_from_user-if-BCM2835_FAST_MEMCPY-n.patch
+++ /dev/null
@@ -1,39 +0,0 @@
-From ab2695d38f4ffadde05c2275ac68f4aad68ef336 Mon Sep 17 00:00:00 2001
-From: Tim Gover <tim.gover@raspberrypi.org>
-Date: Thu, 14 Mar 2019 10:16:02 +0000
-Subject: [PATCH] Fix copy_from_user if BCM2835_FAST_MEMCPY=n
-
-The change which introduced CONFIG_BCM2835_FAST_MEMCPY unconditionally
-changed the behaviour of arm_copy_from_user. The page pinning code
-is not safe on ARMv7 if LPAE & high memory is enabled and causes
-crashes which look like PTE corruption.
-
-Make __copy_from_user_memcpy conditional on CONFIG_2835_FAST_MEMCPY=y
-which is really an ARMv6 / Pi1 optimization and not necessary on newer
-ARM processors.
----
- arch/arm/lib/uaccess_with_memcpy.c | 6 ++++++
- 1 file changed, 6 insertions(+)
-
---- a/arch/arm/lib/uaccess_with_memcpy.c
-+++ b/arch/arm/lib/uaccess_with_memcpy.c
-@@ -257,6 +257,7 @@ arm_copy_to_user(void __user *to, const
- unsigned long __must_check
- arm_copy_from_user(void *to, const void __user *from, unsigned long n)
- {
-+#ifdef CONFIG_BCM2835_FAST_MEMCPY
- 	/*
- 	 * This test is stubbed out of the main function above to keep
- 	 * the overhead for small copies low by avoiding a large
-@@ -271,6 +272,11 @@ arm_copy_from_user(void *to, const void
- 	} else {
- 		n = __copy_from_user_memcpy(to, from, n);
- 	}
-+#else
-+	unsigned long ua_flags = uaccess_save_and_enable();
-+	n = __copy_from_user_std(to, from, n);
-+	uaccess_restore(ua_flags);
-+#endif
- 	return n;
- }
-