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From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Cc: Rob Herring <rob.herring@calxeda.com>
Subject: [PATCH 1/5] linux/types: import __aligned_x64 from the kernel
Date: Fri, 15 Feb 2013 14:35:13 +0100	[thread overview]
Message-ID: <1360935317-7386-1-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <20130215125941.GB19322@game.jcrosoft.org>

need it by upcoming EFI GPT support

Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 include/linux/types.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/types.h b/include/linux/types.h
index 76c6b67..14f8315 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -142,6 +142,19 @@ typedef __u64 __bitwise __be64;
 typedef __u16 __bitwise __sum16;
 typedef __u32 __bitwise __wsum;
 
+/*
+ * aligned_u64 should be used in defining kernel<->userspace ABIs to avoid
+ * common 32/64-bit compat problems.
+ * 64-bit values align to 4-byte boundaries on x86_32 (and possibly other
+ * architectures) and to 8-byte boundaries on 64-bit architectures.  The new
+ * aligned_64 type enforces 8-byte alignment so that structs containing
+ * aligned_64 values have the same alignment on 32-bit and 64-bit architectures.
+ * No conversions are necessary between 32-bit user-space and a 64-bit kernel.
+ */
+#define __aligned_u64 __u64 __attribute__((aligned(8)))
+#define __aligned_be64 __be64 __attribute__((aligned(8)))
+#define __aligned_le64 __le64 __attribute__((aligned(8)))
+
 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 typedef u64 phys_addr_t;
 typedef u64 phys_size_t;
-- 
1.7.10.4


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  reply	other threads:[~2013-02-15 13:36 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-15 12:59 [PATCH 0/5 v3] add EFI GUID Partition Table support Jean-Christophe PLAGNIOL-VILLARD
2013-02-15 13:35 ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2013-02-15 13:35   ` [PATCH 2/5] filetype: add GPT support Jean-Christophe PLAGNIOL-VILLARD
2013-02-15 17:32     ` Sascha Hauer
2013-02-15 17:36       ` Jean-Christophe PLAGNIOL-VILLARD
2013-02-15 17:48         ` Sascha Hauer
2013-02-15 13:35   ` [PATCH 3/5] partitons: add framework Jean-Christophe PLAGNIOL-VILLARD
2013-02-15 17:37     ` Sascha Hauer
2013-02-15 13:35   ` [PATCH 4/5] disk: introduce partition name Jean-Christophe PLAGNIOL-VILLARD
2013-02-15 17:43     ` Sascha Hauer
2013-02-16 11:29       ` Jean-Christophe PLAGNIOL-VILLARD
2013-02-15 13:35   ` [PATCH 5/5] disk: partitions: add EFI GUID Partition Table Jean-Christophe PLAGNIOL-VILLARD
2013-02-15 17:46     ` Sascha Hauer
  -- strict thread matches above, loose matches on Subject: below --
2013-02-16 11:38 [PATCH 0/5 v4] add EFI GUID Partition Table support Jean-Christophe PLAGNIOL-VILLARD
2013-02-16 13:47 ` [PATCH 1/5] linux/types: import __aligned_x64 from the kernel Jean-Christophe PLAGNIOL-VILLARD
2013-02-14 22:42 [PATCH 0/5] add EFI GUID Partition Table support Jean-Christophe PLAGNIOL-VILLARD
2013-02-14 22:44 ` [PATCH 1/5] linux/types: import __aligned_x64 from the kernel Jean-Christophe PLAGNIOL-VILLARD
2013-02-14 15:47 [PATCH 0/5] add EFI GUID Partition Table support Jean-Christophe PLAGNIOL-VILLARD
2013-02-14 15:52 ` [PATCH 1/5] linux/types: import __aligned_x64 from the kernel Jean-Christophe PLAGNIOL-VILLARD

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