linux-kernel - [PATCH 1/2] uapi: introduce __kernel_uapi_size

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Date:   Fri, 3 Mar 2017 03:59:30 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Arnd Bergmann <arnd@...db.de>, "H. Peter Anvin" <hpa@...or.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        linux-arch@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] uapi: introduce __kernel_uapi_size_t

__kernel_uapi_size_t is a pure UAPI type, in defined(__KERNEL__) code
it's always the same as __kernel_size_t.

It's also the same as __kernel_size_t on all architectures except x32
where sizeof(size_t) < sizeof(__kernel_size_t).

__kernel_uapi_size_t can be used as a size_t replacement in UAPI
headers, e.g. in cases when size_t might differ from __kernel_size_t.

Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---
 include/uapi/asm-generic/posix_types.h      | 10 ++++++++++
 arch/x86/include/uapi/asm/posix_types_x32.h |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/include/uapi/asm-generic/posix_types.h b/include/uapi/asm-generic/posix_types.h
index fe74fcc..e93c324 100644
--- a/include/uapi/asm-generic/posix_types.h
+++ b/include/uapi/asm-generic/posix_types.h
@@ -74,6 +74,16 @@ typedef __kernel_long_t	__kernel_ptrdiff_t;
 #endif
 #endif
 
+/*
+ * __kernel_uapi_size_t is a pure UAPI type, in defined(__KERNEL__) code
+ * it's always the same as __kernel_size_t.
+ * __kernel_uapi_size_t can be used as a size_t replacement in UAPI headers,
+ * e.g. in cases when size_t might differ from __kernel_size_t.
+ */
+#ifndef __kernel_uapi_size_t
+typedef __kernel_size_t __kernel_uapi_size_t;
+#endif
+
 #ifndef __kernel_fsid_t
 typedef struct {
 	int	val[2];
diff --git a/arch/x86/include/uapi/asm/posix_types_x32.h b/arch/x86/include/uapi/asm/posix_types_x32.h
index 85f9bda..0e36e67 100644
--- a/arch/x86/include/uapi/asm/posix_types_x32.h
+++ b/arch/x86/include/uapi/asm/posix_types_x32.h
@@ -14,6 +14,9 @@ typedef long long __kernel_long_t;
 typedef unsigned long long __kernel_ulong_t;
 #define __kernel_long_t __kernel_long_t
 
+typedef unsigned int __kernel_uapi_size_t;
+#define __kernel_uapi_size_t __kernel_uapi_size_t
+
 #include <asm/posix_types_64.h>
 
 #endif /* _ASM_X86_POSIX_TYPES_X32_H */
-- 
ldv