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Message-Id: <20061023061348.AC97DEF086@wolfe.lmc.cs.stonybrook.edu>
Date: Mon, 23 Oct 2006 02:13:48 -0400
From: Giridhar Pemmasani <pgiri@...oo.com>
To: linux-kernel@...r.kernel.org
Cc: pgiri@...oo.com
Subject: __vmalloc with GFP_ATOMIC causes 'sleeping from invalid context'
This is follow up of earlier patch:
http://marc.theaimsgroup.com/?l=linux-kernel&m=114833505625992&w=2
Apparently the patch has not been merged (yet), so resending it. The
patch is against 2.6.19-rc2.
Synopsis of patch: If __vmalloc is called to allocate memory with
GFP_ATOMIC in atomic context, the chain of calls results in
__get_vm_area_node allocating memory for vm_struct with GFP_KERNEL,
causing the 'sleeping from invalid context' warning. This patch fixes
it by passing the gfp flags along so __get_vm_area_node allocates
memory for vm_struct with the same flags.
Thanks,
Giri
diff -Naur linux-2.6.19-rc2.orig/include/linux/vmalloc.h linux-2.6.19-rc2/include/linux/vmalloc.h
--- linux-2.6.19-rc2.orig/include/linux/vmalloc.h 2006-10-23 01:43:35.000000000 -0400
+++ linux-2.6.19-rc2/include/linux/vmalloc.h 2006-10-23 01:45:24.000000000 -0400
@@ -60,7 +60,8 @@
extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
unsigned long start, unsigned long end);
extern struct vm_struct *get_vm_area_node(unsigned long size,
- unsigned long flags, int node);
+ unsigned long flags, int node,
+ gfp_t gfp_mask);
extern struct vm_struct *remove_vm_area(void *addr);
extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
struct page ***pages);
diff -Naur linux-2.6.19-rc2.orig/mm/vmalloc.c linux-2.6.19-rc2/mm/vmalloc.c
--- linux-2.6.19-rc2.orig/mm/vmalloc.c 2006-10-23 01:43:55.000000000 -0400
+++ linux-2.6.19-rc2/mm/vmalloc.c 2006-10-23 01:45:24.000000000 -0400
@@ -160,13 +160,15 @@
return err;
}
-struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long flags,
- unsigned long start, unsigned long end, int node)
+static struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long flags,
+ unsigned long start, unsigned long end,
+ int node, gfp_t gfp_mask)
{
struct vm_struct **p, *tmp, *area;
unsigned long align = 1;
unsigned long addr;
+ BUG_ON(in_interrupt());
if (flags & VM_IOREMAP) {
int bit = fls(size);
@@ -180,7 +182,7 @@
addr = ALIGN(start, align);
size = PAGE_ALIGN(size);
- area = kmalloc_node(sizeof(*area), GFP_KERNEL, node);
+ area = kmalloc_node(sizeof(*area), gfp_mask, node);
if (unlikely(!area))
return NULL;
@@ -236,7 +238,7 @@
struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
unsigned long start, unsigned long end)
{
- return __get_vm_area_node(size, flags, start, end, -1);
+ return __get_vm_area_node(size, flags, start, end, -1, GFP_KERNEL);
}
/**
@@ -253,9 +255,11 @@
return __get_vm_area(size, flags, VMALLOC_START, VMALLOC_END);
}
-struct vm_struct *get_vm_area_node(unsigned long size, unsigned long flags, int node)
+struct vm_struct *get_vm_area_node(unsigned long size, unsigned long flags,
+ int node, gfp_t gfp_mask)
{
- return __get_vm_area_node(size, flags, VMALLOC_START, VMALLOC_END, node);
+ return __get_vm_area_node(size, flags, VMALLOC_START, VMALLOC_END, node,
+ gfp_mask);
}
/* Caller must hold vmlist_lock */
@@ -484,7 +488,7 @@
if (!size || (size >> PAGE_SHIFT) > num_physpages)
return NULL;
- area = get_vm_area_node(size, VM_ALLOC, node);
+ area = get_vm_area_node(size, VM_ALLOC, node, gfp_mask);
if (!area)
return NULL;
-
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