linux-kernel - [PATCH v2 2/4] tools headers UAPI: add kmalloc/vmalloc related interface

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Message-ID: <1626747709-34013-3-git-send-email-linyunsheng@huawei.com>
Date:   Tue, 20 Jul 2021 10:21:47 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <mst@...hat.com>,
        <jasowang@...hat.com>
CC:     <nickhu@...estech.com>, <green.hu@...il.com>,
        <deanbo422@...il.com>, <akpm@...ux-foundation.org>,
        <yury.norov@...il.com>, <andriy.shevchenko@...ux.intel.com>,
        <ojeda@...nel.org>, <ndesaulniers@...ogle.com>, <joe@...ches.com>,
        <linux-kernel@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linuxarm@...neuler.org>
Subject: [PATCH v2 2/4] tools headers UAPI: add kmalloc/vmalloc related interface

Implement the kmalloc/vmalloc related interface based on
malloc interface in user space.

Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
---
 tools/include/linux/gfp.h  |  2 ++
 tools/include/linux/slab.h | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 tools/include/linux/slab.h

diff --git a/tools/include/linux/gfp.h b/tools/include/linux/gfp.h
index 2203075..a660ab9 100644
--- a/tools/include/linux/gfp.h
+++ b/tools/include/linux/gfp.h
@@ -1,4 +1,6 @@
 #ifndef _TOOLS_INCLUDE_LINUX_GFP_H
 #define _TOOLS_INCLUDE_LINUX_GFP_H
 
+#define __GFP_ZERO		0x100u
+
 #endif /* _TOOLS_INCLUDE_LINUX_GFP_H */
diff --git a/tools/include/linux/slab.h b/tools/include/linux/slab.h
new file mode 100644
index 0000000..f0b7da6
--- /dev/null
+++ b/tools/include/linux/slab.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __TOOLS_LINUX_SLAB_H
+#define __TOOLS_LINUX_SLAB_H
+
+#include <linux/gfp.h>
+#include <linux/cache.h>
+
+static inline void *kmalloc(size_t size, gfp_t gfp)
+{
+	void *p;
+
+	p = memalign(SMP_CACHE_BYTES, size);
+	if (!p)
+		return p;
+
+	if (gfp & __GFP_ZERO)
+		memset(p, 0, size);
+
+	return p;
+}
+
+static inline void *kzalloc(size_t size, gfp_t flags)
+{
+	return kmalloc(size, flags | __GFP_ZERO);
+}
+
+static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
+{
+	return kmalloc(n * size, flags);
+}
+
+static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
+{
+	return kmalloc_array(n, size, flags | __GFP_ZERO);
+}
+
+static inline void kfree(void *p)
+{
+	free(p);
+}
+
+#define kvmalloc_array		kmalloc_array
+#define kvfree			kfree
+#define KMALLOC_MAX_SIZE	SIZE_MAX
+
+#endif
-- 
2.7.4