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Message-ID: <539764.53941.qm@web32409.mail.mud.yahoo.com>
Date: Fri, 27 Apr 2007 21:03:33 -0700 (PDT)
From: Giridhar Pemmasani <pgiri@...oo.com>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] Allow __vmalloc with GFP_ATOMIC
Until 2.6.19, __vmalloc with GFP_ATOMIC was possible, but __get_vm_area_node
would allocate the node itself with GFP_KERNEL, causing a warning. In 2.6.19,
this was "fixed" by using the same flags that were passed to __vmalloc also
in __get_vm_area_node. However, __get_vm_area_node does
BUG_ON(in_interrupt()) now, since vmlist_lock is obtained without disabling
bottom-half's. The patch below uses bh disabled lock for vmlist_lock, so that
__vmalloc can be used in interrupt context.
In 2.6.21, __vmalloc with GFP_ATOMIC is used by arch/um/kernel/process.c;
__vmalloc is also used in ntfs, xfs, but it is not clear to me if they use it
with GFP_ATOMIC or GFP_KERNEL.
Thanks,
Giri
Signed-off-by: Giridhar Pemmasani <pgiri@...oo.com>
---
--- linux-2.6.21.orig/./arch/arm/mm/ioremap.c 2007-04-25 23:08:32.000000000
-0400
+++ linux-2.6.21.new/./arch/arm/mm/ioremap.c 2007-04-27 23:29:27.000000000
-0400
@@ -363,7 +363,7 @@
* all the mappings before the area can be reclaimed
* by someone else.
*/
- write_lock(&vmlist_lock);
+ write_lock_bh(&vmlist_lock);
for (p = &vmlist ; (tmp = *p) ; p = &tmp->next) {
if((tmp->flags & VM_IOREMAP) && (tmp->addr == addr)) {
if (tmp->flags & VM_ARM_SECTION_MAPPING) {
@@ -376,7 +376,7 @@
break;
}
}
- write_unlock(&vmlist_lock);
+ write_unlock_bh(&vmlist_lock);
#endif
if (!section_mapping)
--- linux-2.6.21.orig/./arch/i386/mm/ioremap.c 2007-04-25 23:08:32.000000000
-0400
+++ linux-2.6.21.new/./arch/i386/mm/ioremap.c 2007-04-27 23:29:27.000000000
-0400
@@ -180,12 +180,12 @@
in parallel. Reuse of the virtual address is prevented by
leaving it in the global lists until we're done with it.
cpa takes care of the direct mappings. */
- read_lock(&vmlist_lock);
+ read_lock_bh(&vmlist_lock);
for (p = vmlist; p; p = p->next) {
if (p->addr == addr)
break;
}
- read_unlock(&vmlist_lock);
+ read_unlock_bh(&vmlist_lock);
if (!p) {
printk("iounmap: bad address %p\n", addr);
--- linux-2.6.21.orig/./arch/x86_64/mm/ioremap.c 2007-04-25
23:08:32.000000000 -0400
+++ linux-2.6.21.new/./arch/x86_64/mm/ioremap.c 2007-04-27 23:29:27.000000000
-0400
@@ -175,12 +175,12 @@
in parallel. Reuse of the virtual address is prevented by
leaving it in the global lists until we're done with it.
cpa takes care of the direct mappings. */
- read_lock(&vmlist_lock);
+ read_lock_bh(&vmlist_lock);
for (p = vmlist; p; p = p->next) {
if (p->addr == addr)
break;
}
- read_unlock(&vmlist_lock);
+ read_unlock_bh(&vmlist_lock);
if (!p) {
printk("iounmap: bad address %p\n", addr);
--- linux-2.6.21.orig/./fs/proc/kcore.c 2007-04-25 23:08:32.000000000 -0400
+++ linux-2.6.21.new/./fs/proc/kcore.c 2007-04-27 23:29:27.000000000 -0400
@@ -335,7 +335,7 @@
if (!elf_buf)
return -ENOMEM;
- read_lock(&vmlist_lock);
+ read_lock_bh(&vmlist_lock);
for (m=vmlist; m && cursize; m=m->next) {
unsigned long vmstart;
unsigned long vmsize;
@@ -363,7 +363,7 @@
memcpy(elf_buf + (vmstart - start),
(char *)vmstart, vmsize);
}
- read_unlock(&vmlist_lock);
+ read_unlock_bh(&vmlist_lock);
if (copy_to_user(buffer, elf_buf, tsz)) {
kfree(elf_buf);
return -EFAULT;
--- linux-2.6.21.orig/./fs/proc/mmu.c 2007-04-25 23:08:32.000000000 -0400
+++ linux-2.6.21.new/./fs/proc/mmu.c 2007-04-27 23:29:41.000000000 -0400
@@ -47,7 +47,7 @@
prev_end = VMALLOC_START;
- read_lock(&vmlist_lock);
+ read_lock_bh(&vmlist_lock);
for (vma = vmlist; vma; vma = vma->next) {
unsigned long addr = (unsigned long) vma->addr;
@@ -72,6 +72,6 @@
if (VMALLOC_END - prev_end > vmi->largest_chunk)
vmi->largest_chunk = VMALLOC_END - prev_end;
- read_unlock(&vmlist_lock);
+ read_unlock_bh(&vmlist_lock);
}
}
--- linux-2.6.21.orig/./mm/vmalloc.c 2007-04-25 23:08:32.000000000 -0400
+++ linux-2.6.21.new/./mm/vmalloc.c 2007-04-27 23:33:17.000000000 -0400
@@ -168,7 +168,7 @@
unsigned long align = 1;
unsigned long addr;
- BUG_ON(in_interrupt());
+ BUG_ON(in_irq());
if (flags & VM_IOREMAP) {
int bit = fls(size);
@@ -193,7 +193,7 @@
*/
size += PAGE_SIZE;
- write_lock(&vmlist_lock);
+ write_lock_bh(&vmlist_lock);
for (p = &vmlist; (tmp = *p) != NULL ;p = &tmp->next) {
if ((unsigned long)tmp->addr < addr) {
if((unsigned long)tmp->addr + tmp->size >= addr)
@@ -220,12 +220,12 @@
area->pages = NULL;
area->nr_pages = 0;
area->phys_addr = 0;
- write_unlock(&vmlist_lock);
+ write_unlock_bh(&vmlist_lock);
return area;
out:
- write_unlock(&vmlist_lock);
+ write_unlock_bh(&vmlist_lock);
kfree(area);
if (printk_ratelimit())
printk(KERN_WARNING "allocation failed: out of vmalloc space - use
vmalloc=<size> to increase size.\n");
@@ -305,9 +305,9 @@
struct vm_struct *remove_vm_area(void *addr)
{
struct vm_struct *v;
- write_lock(&vmlist_lock);
+ write_lock_bh(&vmlist_lock);
v = __remove_vm_area(addr);
- write_unlock(&vmlist_lock);
+ write_unlock_bh(&vmlist_lock);
return v;
}
@@ -364,7 +364,7 @@
*/
void vfree(void *addr)
{
- BUG_ON(in_interrupt());
+ BUG_ON(in_irq());
__vunmap(addr, 1);
}
EXPORT_SYMBOL(vfree);
@@ -380,7 +380,7 @@
*/
void vunmap(void *addr)
{
- BUG_ON(in_interrupt());
+ BUG_ON(in_irq());
__vunmap(addr, 0);
}
EXPORT_SYMBOL(vunmap);
@@ -530,10 +530,10 @@
ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
PAGE_KERNEL);
if (ret) {
- write_lock(&vmlist_lock);
+ write_lock_bh(&vmlist_lock);
area = __find_vm_area(ret);
area->flags |= VM_USERMAP;
- write_unlock(&vmlist_lock);
+ write_unlock_bh(&vmlist_lock);
}
return ret;
}
@@ -604,10 +604,10 @@
ret = __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
if (ret) {
- write_lock(&vmlist_lock);
+ write_lock_bh(&vmlist_lock);
area = __find_vm_area(ret);
area->flags |= VM_USERMAP;
- write_unlock(&vmlist_lock);
+ write_unlock_bh(&vmlist_lock);
}
return ret;
}
@@ -623,7 +623,7 @@
if ((unsigned long) addr + count < count)
count = -(unsigned long) addr;
- read_lock(&vmlist_lock);
+ read_lock_bh(&vmlist_lock);
for (tmp = vmlist; tmp; tmp = tmp->next) {
vaddr = (char *) tmp->addr;
if (addr >= vaddr + tmp->size - PAGE_SIZE)
@@ -647,7 +647,7 @@
} while (--n > 0);
}
finished:
- read_unlock(&vmlist_lock);
+ read_unlock_bh(&vmlist_lock);
return buf - buf_start;
}
@@ -661,7 +661,7 @@
if ((unsigned long) addr + count < count)
count = -(unsigned long) addr;
- read_lock(&vmlist_lock);
+ read_lock_bh(&vmlist_lock);
for (tmp = vmlist; tmp; tmp = tmp->next) {
vaddr = (char *) tmp->addr;
if (addr >= vaddr + tmp->size - PAGE_SIZE)
@@ -684,7 +684,7 @@
} while (--n > 0);
}
finished:
- read_unlock(&vmlist_lock);
+ read_unlock_bh(&vmlist_lock);
return buf - buf_start;
}
@@ -712,7 +712,7 @@
if ((PAGE_SIZE-1) & (unsigned long)addr)
return -EINVAL;
- read_lock(&vmlist_lock);
+ read_lock_bh(&vmlist_lock);
area = __find_vm_area(addr);
if (!area)
goto out_einval_locked;
@@ -722,7 +722,7 @@
if (usize + (pgoff << PAGE_SHIFT) > area->size - PAGE_SIZE)
goto out_einval_locked;
- read_unlock(&vmlist_lock);
+ read_unlock_bh(&vmlist_lock);
addr += pgoff << PAGE_SHIFT;
do {
@@ -742,7 +742,7 @@
return ret;
out_einval_locked:
- read_unlock(&vmlist_lock);
+ read_unlock_bh(&vmlist_lock);
return -EINVAL;
}
EXPORT_SYMBOL(remap_vmalloc_range);
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