Add a common Kconfig CONFIG_ARCH_HAS_UACCESS_MCSAFE that archs can
optionally select, and fixup the declaration of _copy_to_iter_mcsafe().
Fixes: 8780356ef630 ("x86/asm/memcpy_mcsafe: Define copy_to_iter_mcsafe()")
Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
Ingo, Thomas, fyi, here is a trivial compilation fixup I will carry in
my tree based on tip/x86/dax. I missed defining the Kconfig symbol, and
my unit test was only dependent on the low level implementation.
include/linux/uio.h | 2 +-
lib/Kconfig | 3 +++
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/linux/uio.h b/include/linux/uio.h
index f5766e853a77..409c845d4cd3 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -155,7 +155,7 @@ size_t _copy_from_iter_flushcache(void *addr, size_t bytes,
struct iov_iter *i);
#endif
#ifdef CONFIG_ARCH_HAS_UACCESS_MCSAFE
-size_t _copy_to_iter_mcsafe(void *addr, size_t bytes, struct iov_iter *i);
+size_t _copy_to_iter_mcsafe(const void *addr, size_t bytes, struct iov_iter
*i);
#else
#define _copy_to_iter_mcsafe _copy_to_iter
#endif
diff --git a/lib/Kconfig b/lib/Kconfig
index 5fe577673b98..907f6e4f1cf2 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -586,6 +586,9 @@ config ARCH_HAS_PMEM_API
config ARCH_HAS_UACCESS_FLUSHCACHE
bool
+config ARCH_HAS_UACCESS_MCSAFE
+ bool
+
config STACKDEPOT
bool
select STACKTRACE
