From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: <linuxppc-dev@ozlabs.org>
Subject: [RFC/PATCH 7/9] powerpc: Fix kmalloc alignmenent on non-coherent DMA
Date: Mon, 19 Nov 2007 19:25:06 +1100 [thread overview]
Message-ID: <20071119082553.C13E4DDE3D@ozlabs.org> (raw)
In-Reply-To: <1195460700.350036.781662541765.qpush@grosgo>
On platforms doing non-coherent DMA (4xx, 8xx, ...), it's important that
kmalloc minimum alignment is set to the cache line size, to avoid sharing
cache lines between different objects.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
include/asm-powerpc/page_32.h | 4 ++++
1 file changed, 4 insertions(+)
Index: linux-work/include/asm-powerpc/page_32.h
===================================================================
--- linux-work.orig/include/asm-powerpc/page_32.h 2007-11-19 15:01:08.000000000 +1100
+++ linux-work/include/asm-powerpc/page_32.h 2007-11-19 15:01:17.000000000 +1100
@@ -6,6 +6,10 @@
#define PPC_MEMSTART 0
+#ifdef CONFIG_NOT_COHERENT_CACHE
+#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
+#endif
+
#ifndef __ASSEMBLY__
/*
* The basic type of a PTE - 64 bits for those CPUs with > 32 bit
next prev parent reply other threads:[~2007-11-19 8:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-19 8:25 [RFC/PATCH 0/9] powerpc: 4xx PCI work in progress Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 1/9] powerpc: Make isa_mem_base common to 32 and 64 bits Benjamin Herrenschmidt
2007-11-19 10:32 ` Christoph Hellwig
2007-11-19 19:49 ` Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 2/9] powerpc: Merge pci_process_bridge_OF_ranges() Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 3/9] powerpc: Fix declaration of pcibios_free_controller Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 4/9] powerpc: Fix powerpc 32 bits resource fixup for 64 bits resources Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 5/9] powerpc: Fix 440/440A machine check handling Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 6/9] powerpc: Add xmon function to dump 44x TLB Benjamin Herrenschmidt
2007-11-19 8:25 ` Benjamin Herrenschmidt [this message]
2007-11-19 8:25 ` [RFC/PATCH 8/9] powerpc 4xx PCI support Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 9/9] powerpc: PCI support for 4xx Ebony board Benjamin Herrenschmidt
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