[PATCH] tools: Copy linux/align.h into tools/

[PATCH] tools: Copy linux/align.h into tools/

[Ackerley Tng]

This provides alignment macros for use in selftests.

Also clean up tools/include/linux/bitmap.h's inline definition of
IS_ALIGNED().

Signed-off-by: Ackerley Tng <ackerleytng@google.com>
---
 tools/include/linux/align.h  | 15 +++++++++++++++
 tools/include/linux/bitmap.h |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 tools/include/linux/align.h

diff --git a/tools/include/linux/align.h b/tools/include/linux/align.h
new file mode 100644
index 000000000000..2b4acec7b95a
--- /dev/null
+++ b/tools/include/linux/align.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_ALIGN_H
+#define _LINUX_ALIGN_H
+
+#include <linux/const.h>
+
+/* @a is a power of 2 value */
+#define ALIGN(x, a)		__ALIGN_KERNEL((x), (a))
+#define ALIGN_DOWN(x, a)	__ALIGN_KERNEL((x) - ((a) - 1), (a))
+#define __ALIGN_MASK(x, mask)	__ALIGN_KERNEL_MASK((x), (mask))
+#define PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a)))
+#define PTR_ALIGN_DOWN(p, a)	((typeof(p))ALIGN_DOWN((unsigned long)(p), (a)))
+#define IS_ALIGNED(x, a)		(((x) & ((typeof(x))(a) - 1)) == 0)
+
+#endif	/* _LINUX_ALIGN_H */
diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h
index f3566ea0f932..8c6852dba04f 100644
--- a/tools/include/linux/bitmap.h
+++ b/tools/include/linux/bitmap.h
@@ -3,6 +3,7 @@
 #define _TOOLS_LINUX_BITMAP_H
 
 #include <string.h>
+#include <linux/align.h>
 #include <linux/bitops.h>
 #include <linux/find.h>
 #include <stdlib.h>
@@ -126,7 +127,6 @@ static inline bool bitmap_and(unsigned long *dst, const unsigned long *src1,
 #define BITMAP_MEM_ALIGNMENT (8 * sizeof(unsigned long))
 #endif
 #define BITMAP_MEM_MASK (BITMAP_MEM_ALIGNMENT - 1)
-#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
 
 static inline bool bitmap_equal(const unsigned long *src1,
 				const unsigned long *src2, unsigned int nbits)
-- 
2.39.2.722.g9855ee24e9-goog

Re: [PATCH] tools: Copy linux/align.h into tools/

[Sean Christopherson]

On Mon, Feb 27, 2023, Ackerley Tng wrote:
> This provides alignment macros for use in selftests.
> 
> Also clean up tools/include/linux/bitmap.h's inline definition of
> IS_ALIGNED().
> 
> Signed-off-by: Ackerley Tng <ackerleytng@google.com>
> ---
>  tools/include/linux/align.h  | 15 +++++++++++++++
>  tools/include/linux/bitmap.h |  2 +-
>  2 files changed, 16 insertions(+), 1 deletion(-)
>  create mode 100644 tools/include/linux/align.h

Anyone object to pulling in align.h?  I'd be more than happy to take this through
the KVM tree, which is the motivation/context (we want to use the various macros
in KVM selftests).

Thanks!