[PATCH 4.12 63/65] Revert "MIPS: Dont unnecessarily include kmalloc.h into <asm/cache.h>."

From	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Newsgroups	linux.kernel
Subject	[PATCH 4.12 63/65] Revert "MIPS: Dont unnecessarily include kmalloc.h into <asm/cache.h>."
Date	2017-08-15 03:30 +0200
Message-ID	<ueyQc-39h-57@gated-at.bofh.it> (permalink)
References	<ueyQ9-39h-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paul Burton <paul.burton@imgtec.com>

commit ae5b0675942ab30cde96099c68a2290bd1aafcca upstream.

Commit 296e46db0073 ("MIPS: Don't unnecessarily include kmalloc.h into
<asm/cache.h>.") claimed that the inclusion of the machine's kmalloc.h
from asm/cache.h is unnecessary, but this is not true.

Without including kmalloc.h we don't get a definition for
ARCH_DMA_MINALIGN, which means we no longer suitably align DMA. Further
to this the definition of ARCH_KMALLOC_MINALIGN provided by linux/slab.h
ends up being set to the alignment of an unsigned long long value rather
than to ARCH_DMA_MINALIGN, which means that buffers allocated using
kmalloc may no longer be safely aligned for use with DMA.

Fix this by re-adding the include of kmalloc.h in asm/cache.h. This
reverts commit 296e46db0073 ("MIPS: Don't unnecessarily include
kmalloc.h into <asm/cache.h>.")

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: 296e46db0073 ("MIPS: Don't unnecessarily include kmalloc.h into <asm/cache.h>.")
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16895/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/mips/include/asm/cache.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/mips/include/asm/cache.h
+++ b/arch/mips/include/asm/cache.h
@@ -9,6 +9,8 @@
 #ifndef _ASM_CACHE_H
 #define _ASM_CACHE_H
 
+#include <kmalloc.h>
+
 #define L1_CACHE_SHIFT		CONFIG_MIPS_L1_CACHE_SHIFT
 #define L1_CACHE_BYTES		(1 << L1_CACHE_SHIFT)

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[PATCH 4.12 63/65] Revert "MIPS: Dont unnecessarily include kmalloc.h into <asm/cache.h>." Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-08-15 03:30 +0200

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