linux-kernel - [PATCH] alpha: fix vmalloc breakage

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Date:	Thu, 8 Jan 2009 02:01:44 +0300
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Richard Henderson <rth@...ddle.net>, linux-kernel@...r.kernel.org
Subject: [PATCH] alpha: fix vmalloc breakage

On alpha, we have to map some stuff in the VMALLOC space very
early in the boot process (to make SRM console callbacks work
and so on, see arch/alpha/mm/init.c). For old VM allocator,
we just manually placed a vm_struct onto the global vmlist
and this worked for ages.
Unfortunately, the new allocator isn't aware of this, so it constantly
tries to allocate the VM space which is already in use, making vmalloc
on alpha defunct.

This patch forces KVA to import vmlist entries on init.

Signed-off-by: Ivan Kokshaysky <ink@...assic.park.msu.ru>
---
 mm/vmalloc.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index c5db9a7..0dd9c2e 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -24,6 +24,7 @@
 #include <linux/rbtree.h>
 #include <linux/radix-tree.h>
 #include <linux/rcupdate.h>
+#include <linux/bootmem.h>
 
 #include <asm/atomic.h>
 #include <asm/uaccess.h>
@@ -984,6 +985,8 @@ EXPORT_SYMBOL(vm_map_ram);
 
 void __init vmalloc_init(void)
 {
+	struct vmap_area *va;
+	struct vm_struct *tmp;
 	int i;
 
 	for_each_possible_cpu(i) {
@@ -996,6 +999,16 @@ void __init vmalloc_init(void)
 		vbq->nr_dirty = 0;
 	}
 
+	/* Import existing vmlist entries. */
+	for (tmp = vmlist; tmp; tmp = tmp->next) {
+		va = alloc_bootmem(sizeof(struct vmap_area));
+		if (!va)
+			break;
+		va->flags = tmp->flags | VM_VM_AREA;
+		va->va_start = (unsigned long)tmp->addr;
+		va->va_end = va->va_start + tmp->size;
+		__insert_vmap_area(va);
+	}
 	vmap_initialized = true;
 }
 
--
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