linux-kernel - [PATCH] vmalloc_32 should use GFP

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Date:	Wed, 18 Jul 2007 16:25:34 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linux Kernel list <linux-kernel@...r.kernel.org>
Cc:	linux-mm@...ck.org, Dave Airlie <airlied@...il.com>,
	Andrew Morton <akpm@...l.org>
Subject: [PATCH] vmalloc_32 should use GFP_KERNEL

I've noticed lots of failures of vmalloc_32 on machines where it
shouldn't have failed unless it was doing an atomic operation.

Looking closely, I noticed that:

#if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)
#define GFP_VMALLOC32 GFP_DMA32
#elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA)
#define GFP_VMALLOC32 GFP_DMA
#else
#define GFP_VMALLOC32 GFP_KERNEL
#endif

Which seems to be incorrect, it should always -or- in the DMA flags
on top of GFP_KERNEL, thus this patch.

Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---

This fixes frequent errors launchin X with the nouveau DRM for example.

Index: linux-work/mm/vmalloc.c
===================================================================
--- linux-work.orig/mm/vmalloc.c	2007-07-18 16:22:00.000000000 +1000
+++ linux-work/mm/vmalloc.c	2007-07-18 16:22:11.000000000 +1000
@@ -578,9 +578,9 @@ void *vmalloc_exec(unsigned long size)
 }
 
 #if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)
-#define GFP_VMALLOC32 GFP_DMA32
+#define GFP_VMALLOC32 GFP_DMA32 | GFP_KERNEL
 #elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA)
-#define GFP_VMALLOC32 GFP_DMA
+#define GFP_VMALLOC32 GFP_DMA | GFP_KERNEL
 #else
 #define GFP_VMALLOC32 GFP_KERNEL
 #endif


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