summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--arch/mips/kernel/irixelf.c11
-rw-r--r--arch/sparc64/kernel/binfmt_aout32.c12
-rw-r--r--arch/x86_64/ia32/ia32_aout.c12
-rw-r--r--arch/x86_64/mm/k8topology.c23
-rw-r--r--arch/x86_64/mm/numa.c10
-rw-r--r--arch/x86_64/mm/srat.c19
-rw-r--r--fs/binfmt_aout.c17
-rw-r--r--fs/binfmt_elf.c12
-rw-r--r--include/asm-x86_64/numa.h2
-rw-r--r--include/linux/nodemask.h9
-rw-r--r--mm/mmap.c54
11 files changed, 138 insertions, 43 deletions
diff --git a/arch/mips/kernel/irixelf.c b/arch/mips/kernel/irixelf.c
index aee1f399e15b..43c254299e4a 100644
--- a/arch/mips/kernel/irixelf.c
+++ b/arch/mips/kernel/irixelf.c
@@ -127,7 +127,9 @@ static void set_brk(unsigned long start, unsigned long end)
end = PAGE_ALIGN(end);
if (end <= start)
return;
+ down_write(&current->mm->mmap_sem);
do_brk(start, end - start);
+ up_write(&current->mm->mmap_sem);
}
@@ -375,7 +377,9 @@ static unsigned int load_irix_interp(struct elfhdr * interp_elf_ex,
/* Map the last of the bss segment */
if (last_bss > len) {
+ down_write(&current->mm->mmap_sem);
do_brk(len, (last_bss - len));
+ up_write(&current->mm->mmap_sem);
}
kfree(elf_phdata);
@@ -562,7 +566,9 @@ void irix_map_prda_page (void)
unsigned long v;
struct prda *pp;
+ down_write(&current->mm->mmap_sem);
v = do_brk (PRDA_ADDRESS, PAGE_SIZE);
+ up_write(&current->mm->mmap_sem);
if (v < 0)
return;
@@ -852,8 +858,11 @@ static int load_irix_library(struct file *file)
len = (elf_phdata->p_filesz + elf_phdata->p_vaddr+ 0xfff) & 0xfffff000;
bss = elf_phdata->p_memsz + elf_phdata->p_vaddr;
- if (bss > len)
+ if (bss > len) {
+ down_write(&current->mm->mmap_sem);
do_brk(len, bss-len);
+ up_write(&current->mm->mmap_sem);
+ }
kfree(elf_phdata);
return 0;
}
diff --git a/arch/sparc64/kernel/binfmt_aout32.c b/arch/sparc64/kernel/binfmt_aout32.c
index c54d806e13d2..1afe88f6abc0 100644
--- a/arch/sparc64/kernel/binfmt_aout32.c
+++ b/arch/sparc64/kernel/binfmt_aout32.c
@@ -49,7 +49,9 @@ static void set_brk(unsigned long start, unsigned long end)
end = PAGE_ALIGN(end);
if (end <= start)
return;
+ down_write(&current->mm->mmap_sem);
do_brk(start, end - start);
+ up_write(&current->mm->mmap_sem);
}
/*
@@ -246,10 +248,14 @@ static int load_aout32_binary(struct linux_binprm * bprm, struct pt_regs * regs)
if (N_MAGIC(ex) == NMAGIC) {
loff_t pos = fd_offset;
/* Fuck me plenty... */
+ down_write(&current->mm->mmap_sem);
error = do_brk(N_TXTADDR(ex), ex.a_text);
+ up_write(&current->mm->mmap_sem);
bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
ex.a_text, &pos);
+ down_write(&current->mm->mmap_sem);
error = do_brk(N_DATADDR(ex), ex.a_data);
+ up_write(&current->mm->mmap_sem);
bprm->file->f_op->read(bprm->file, (char __user *)N_DATADDR(ex),
ex.a_data, &pos);
goto beyond_if;
@@ -257,8 +263,10 @@ static int load_aout32_binary(struct linux_binprm * bprm, struct pt_regs * regs)
if (N_MAGIC(ex) == OMAGIC) {
loff_t pos = fd_offset;
+ down_write(&current->mm->mmap_sem);
do_brk(N_TXTADDR(ex) & PAGE_MASK,
ex.a_text+ex.a_data + PAGE_SIZE - 1);
+ up_write(&current->mm->mmap_sem);
bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
ex.a_text+ex.a_data, &pos);
} else {
@@ -272,7 +280,9 @@ static int load_aout32_binary(struct linux_binprm * bprm, struct pt_regs * regs)
if (!bprm->file->f_op->mmap) {
loff_t pos = fd_offset;
+ down_write(&current->mm->mmap_sem);
do_brk(0, ex.a_text+ex.a_data);
+ up_write(&current->mm->mmap_sem);
bprm->file->f_op->read(bprm->file,
(char __user *)N_TXTADDR(ex),
ex.a_text+ex.a_data, &pos);
@@ -389,7 +399,9 @@ static int load_aout32_library(struct file *file)
len = PAGE_ALIGN(ex.a_text + ex.a_data);
bss = ex.a_text + ex.a_data + ex.a_bss;
if (bss > len) {
+ down_write(&current->mm->mmap_sem);
error = do_brk(start_addr + len, bss - len);
+ up_write(&current->mm->mmap_sem);
retval = error;
if (error != start_addr + len)
goto out;
diff --git a/arch/x86_64/ia32/ia32_aout.c b/arch/x86_64/ia32/ia32_aout.c
index 6ac57fcf1340..2014f2113cd8 100644
--- a/arch/x86_64/ia32/ia32_aout.c
+++ b/arch/x86_64/ia32/ia32_aout.c
@@ -115,7 +115,9 @@ static void set_brk(unsigned long start, unsigned long end)
end = PAGE_ALIGN(end);
if (end <= start)
return;
+ down_write(&current->mm->mmap_sem);
do_brk(start, end - start);
+ up_write(&current->mm->mmap_sem);
}
#if CORE_DUMP
@@ -325,7 +327,10 @@ static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
pos = 32;
map_size = ex.a_text+ex.a_data;
+ down_write(&current->mm->mmap_sem);
error = do_brk(text_addr & PAGE_MASK, map_size);
+ up_write(&current->mm->mmap_sem);
+
if (error != (text_addr & PAGE_MASK)) {
send_sig(SIGKILL, current, 0);
return error;
@@ -361,7 +366,9 @@ static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
loff_t pos = fd_offset;
+ down_write(&current->mm->mmap_sem);
do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
+ up_write(&current->mm->mmap_sem);
bprm->file->f_op->read(bprm->file,(char *)N_TXTADDR(ex),
ex.a_text+ex.a_data, &pos);
flush_icache_range((unsigned long) N_TXTADDR(ex),
@@ -469,8 +476,9 @@ static int load_aout_library(struct file *file)
error_time = jiffies;
}
#endif
-
+ down_write(&current->mm->mmap_sem);
do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
+ up_write(&current->mm->mmap_sem);
file->f_op->read(file, (char *)start_addr,
ex.a_text + ex.a_data, &pos);
@@ -494,7 +502,9 @@ static int load_aout_library(struct file *file)
len = PAGE_ALIGN(ex.a_text + ex.a_data);
bss = ex.a_text + ex.a_data + ex.a_bss;
if (bss > len) {
+ down_write(&current->mm->mmap_sem);
error = do_brk(start_addr + len, bss - len);
+ up_write(&current->mm->mmap_sem);
retval = error;
if (error != start_addr + len)
goto out;
diff --git a/arch/x86_64/mm/k8topology.c b/arch/x86_64/mm/k8topology.c
index b3acd04b3b30..55a2e67e32a6 100644
--- a/arch/x86_64/mm/k8topology.c
+++ b/arch/x86_64/mm/k8topology.c
@@ -47,6 +47,10 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
int nodeid, i, nb;
int found = 0;
u32 reg;
+ unsigned numnodes;
+ nodemask_t nodes_parsed;
+
+ nodes_clear(nodes_parsed);
nb = find_northbridge();
if (nb < 0)
@@ -55,10 +59,9 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb);
reg = read_pci_config(0, nb, 0, 0x60);
- for (i = 0; i <= ((reg >> 4) & 7); i++)
- node_set_online(i);
+ numnodes = ((reg >> 4) & 7) + 1;
- printk(KERN_INFO "Number of nodes %d (%x)\n", num_online_nodes(), reg);
+ printk(KERN_INFO "Number of nodes %d\n", numnodes);
memset(&nodes,0,sizeof(nodes));
prevbase = 0;
@@ -70,11 +73,11 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
nodeid = limit & 7;
if ((base & 3) == 0) {
- if (i < num_online_nodes())
+ if (i < numnodes)
printk("Skipping disabled node %d\n", i);
continue;
}
- if (nodeid >= num_online_nodes()) {
+ if (nodeid >= numnodes) {
printk("Ignoring excess node %d (%lx:%lx)\n", nodeid,
base, limit);
continue;
@@ -90,7 +93,7 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
nodeid, (base>>8)&3, (limit>>8) & 3);
return -1;
}
- if (node_online(nodeid)) {
+ if (node_isset(nodeid, nodes_parsed)) {
printk(KERN_INFO "Node %d already present. Skipping\n",
nodeid);
continue;
@@ -138,12 +141,14 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
nodes[nodeid].end = limit;
prevbase = base;
+
+ node_set(nodeid, nodes_parsed);
}
if (!found)
return -1;
- memnode_shift = compute_hash_shift(nodes);
+ memnode_shift = compute_hash_shift(nodes, numnodes);
if (memnode_shift < 0) {
printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n");
return -1;
@@ -154,8 +159,8 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
if (nodes[i].start != nodes[i].end) {
/* assume 1:1 NODE:CPU */
cpu_to_node[i] = i;
- setup_node_bootmem(i, nodes[i].start, nodes[i].end);
- }
+ setup_node_bootmem(i, nodes[i].start, nodes[i].end);
+ }
}
numa_init_array();
diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c
index b1a7db4f4d6d..ecc0c60989c0 100644
--- a/arch/x86_64/mm/numa.c
+++ b/arch/x86_64/mm/numa.c
@@ -34,9 +34,7 @@ cpumask_t node_to_cpumask[MAX_NUMNODES];
int numa_off __initdata;
-unsigned long nodes_present;
-
-int __init compute_hash_shift(struct node *nodes)
+int __init compute_hash_shift(struct node *nodes, int numnodes)
{
int i;
int shift = 24;
@@ -45,7 +43,7 @@ int __init compute_hash_shift(struct node *nodes)
/* When in doubt use brute force. */
while (shift < 48) {
memset(memnodemap,0xff,sizeof(*memnodemap) * NODEMAPSIZE);
- for_each_online_node(i) {
+ for (i = 0; i < numnodes; i++) {
if (nodes[i].start == nodes[i].end)
continue;
for (addr = nodes[i].start;
@@ -197,7 +195,7 @@ static int numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
(nodes[i].end - nodes[i].start) >> 20);
node_set_online(i);
}
- memnode_shift = compute_hash_shift(nodes);
+ memnode_shift = compute_hash_shift(nodes, numa_fake);
if (memnode_shift < 0) {
memnode_shift = 0;
printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n");
@@ -274,7 +272,7 @@ void __init paging_init(void)
/* [numa=off] */
__init int numa_setup(char *opt)
{
- if (!strcmp(opt,"off"))
+ if (!strncmp(opt,"off",3))
numa_off = 1;
#ifdef CONFIG_NUMA_EMU
if(!strncmp(opt, "fake=", 5)) {
diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
index 1db7483a0564..3bd04832f041 100644
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -20,17 +20,20 @@
static struct acpi_table_slit *acpi_slit;
-static DECLARE_BITMAP(nodes_parsed, MAX_NUMNODES) __initdata;
+static nodemask_t nodes_parsed __initdata;
+static nodemask_t nodes_found __initdata;
static struct node nodes[MAX_NUMNODES] __initdata;
static __u8 pxm2node[256] __initdata = { [0 ... 255] = 0xff };
static __init int setup_node(int pxm)
{
- if (pxm2node[pxm] == 0xff) {
- if (num_online_nodes() >= MAX_NUMNODES)
+ unsigned node = pxm2node[pxm];
+ if (node == 0xff) {
+ if (nodes_weight(nodes_found) >= MAX_NUMNODES)
return -1;
- pxm2node[pxm] = num_online_nodes();
- node_set_online(num_online_nodes());
+ node = first_unset_node(nodes_found);
+ node_set(node, nodes_found);
+ pxm2node[pxm] = node;
}
return pxm2node[pxm];
}
@@ -140,7 +143,7 @@ acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
return;
}
nd = &nodes[node];
- if (!test_and_set_bit(node, &nodes_parsed)) {
+ if (!node_test_and_set(node, nodes_parsed)) {
nd->start = start;
nd->end = end;
} else {
@@ -163,7 +166,7 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
int i;
if (acpi_numa <= 0)
return -1;
- memnode_shift = compute_hash_shift(nodes);
+ memnode_shift = compute_hash_shift(nodes, nodes_weight(nodes_parsed));
if (memnode_shift < 0) {
printk(KERN_ERR
"SRAT: No NUMA node hash function found. Contact maintainer\n");
@@ -171,7 +174,7 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
return -1;
}
for (i = 0; i < MAX_NUMNODES; i++) {
- if (!test_bit(i, &nodes_parsed))
+ if (!node_isset(i, nodes_parsed))
continue;
cutoff_node(i, start, end);
if (nodes[i].start == nodes[i].end)
diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
index 8075fdff2364..a53d9a9e0de4 100644
--- a/fs/binfmt_aout.c
+++ b/fs/binfmt_aout.c
@@ -50,7 +50,10 @@ static int set_brk(unsigned long start, unsigned long end)
start = PAGE_ALIGN(start);
end = PAGE_ALIGN(end);
if (end > start) {
- unsigned long addr = do_brk(start, end - start);
+ unsigned long addr;
+ down_write(&current->mm->mmap_sem);
+ addr = do_brk(start, end - start);
+ up_write(&current->mm->mmap_sem);
if (BAD_ADDR(addr))
return addr;
}
@@ -323,10 +326,14 @@ static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
loff_t pos = fd_offset;
/* Fuck me plenty... */
/* <AOL></AOL> */
+ down_write(&current->mm->mmap_sem);
error = do_brk(N_TXTADDR(ex), ex.a_text);
+ up_write(&current->mm->mmap_sem);
bprm->file->f_op->read(bprm->file, (char *) N_TXTADDR(ex),
ex.a_text, &pos);
+ down_write(&current->mm->mmap_sem);
error = do_brk(N_DATADDR(ex), ex.a_data);
+ up_write(&current->mm->mmap_sem);
bprm->file->f_op->read(bprm->file, (char *) N_DATADDR(ex),
ex.a_data, &pos);
goto beyond_if;
@@ -346,8 +353,9 @@ static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
pos = 32;
map_size = ex.a_text+ex.a_data;
#endif
-
+ down_write(&current->mm->mmap_sem);
error = do_brk(text_addr & PAGE_MASK, map_size);
+ up_write(&current->mm->mmap_sem);
if (error != (text_addr & PAGE_MASK)) {
send_sig(SIGKILL, current, 0);
return error;
@@ -382,7 +390,9 @@ static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
loff_t pos = fd_offset;
+ down_write(&current->mm->mmap_sem);
do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
+ up_write(&current->mm->mmap_sem);
bprm->file->f_op->read(bprm->file,
(char __user *)N_TXTADDR(ex),
ex.a_text+ex.a_data, &pos);
@@ -487,8 +497,9 @@ static int load_aout_library(struct file *file)
file->f_dentry->d_name.name);
error_time = jiffies;
}
-
+ down_write(&current->mm->mmap_sem);
do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
+ up_write(&current->mm->mmap_sem);
file->f_op->read(file, (char __user *)start_addr,
ex.a_text + ex.a_data, &pos);
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index a66bc8df6d6f..6eb6971bdee2 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -88,7 +88,10 @@ static int set_brk(unsigned long start, unsigned long end)
start = ELF_PAGEALIGN(start);
end = ELF_PAGEALIGN(end);
if (end > start) {
- unsigned long addr = do_brk(start, end - start);
+ unsigned long addr;
+ down_write(&current->mm->mmap_sem);
+ addr = do_brk(start, end - start);
+ up_write(&current->mm->mmap_sem);
if (BAD_ADDR(addr))
return addr;
}
@@ -409,7 +412,9 @@ static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
/* Map the last of the bss segment */
if (last_bss > elf_bss) {
+ down_write(&current->mm->mmap_sem);
error = do_brk(elf_bss, last_bss - elf_bss);
+ up_write(&current->mm->mmap_sem);
if (BAD_ADDR(error))
goto out_close;
}
@@ -449,7 +454,9 @@ static unsigned long load_aout_interp(struct exec * interp_ex,
goto out;
}
+ down_write(&current->mm->mmap_sem);
do_brk(0, text_data);
+ up_write(&current->mm->mmap_sem);
if (!interpreter->f_op || !interpreter->f_op->read)
goto out;
if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0)
@@ -457,8 +464,11 @@ static unsigned long load_aout_interp(struct exec * interp_ex,
flush_icache_range((unsigned long)addr,
(unsigned long)addr + text_data);
+
+ down_write(&current->mm->mmap_sem);
do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
interp_ex->a_bss);
+ up_write(&current->mm->mmap_sem);
elf_entry = interp_ex->a_entry;
out:
diff --git a/include/asm-x86_64/numa.h b/include/asm-x86_64/numa.h
index 21843b35ef18..3574f604542b 100644
--- a/include/asm-x86_64/numa.h
+++ b/include/asm-x86_64/numa.h
@@ -8,7 +8,7 @@ struct node {
u64 start,end;
};
-extern int compute_hash_shift(struct node *nodes);
+extern int compute_hash_shift(struct node *nodes, int numnodes);
#define ZONE_ALIGN (1UL << (MAX_ORDER+PAGE_SHIFT))
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 4de843d94147..16475a23efa7 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -38,6 +38,8 @@
*
* int first_node(mask) Number lowest set bit, or MAX_NUMNODES
* int next_node(node, mask) Next node past 'node', or MAX_NUMNODES
+ * int first_unset_node(mask) First node not set in mask, or
+ * MAX_NUMNODES.
*
* nodemask_t nodemask_of_node(node) Return nodemask with bit 'node' set
* NODE_MASK_ALL Initializer - all bits set
@@ -235,6 +237,13 @@ static inline int __next_node(int n, const nodemask_t *srcp, int nbits)
m; \
})
+#define first_unset_node(mask) __first_unset_node(&(mask))
+static inline int __first_unset_node(const nodemask_t *maskp)
+{
+ return min_t(int,MAX_NUMNODES,
+ find_first_zero_bit(maskp->bits, MAX_NUMNODES));
+}
+
#define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES)
#if MAX_NUMNODES <= BITS_PER_LONG
diff --git a/mm/mmap.c b/mm/mmap.c
index f0d1f464ee00..21329bf3dea3 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1475,7 +1475,6 @@ static int acct_stack_growth(struct vm_area_struct * vma, unsigned long size, un
int expand_stack(struct vm_area_struct * vma, unsigned long address)
{
int error;
- unsigned long size, grow;
if (!(vma->vm_flags & VM_GROWSUP))
return -EFAULT;
@@ -1495,12 +1494,19 @@ int expand_stack(struct vm_area_struct * vma, unsigned long address)
*/
address += 4 + PAGE_SIZE - 1;
address &= PAGE_MASK;
- size = address - vma->vm_start;
- grow = (address - vma->vm_end) >> PAGE_SHIFT;
+ error = 0;
- error = acct_stack_growth(vma, size, grow);
- if (!error)
- vma->vm_end = address;
+ /* Somebody else might have raced and expanded it already */
+ if (address > vma->vm_end) {
+ unsigned long size, grow;
+
+ size = address - vma->vm_start;
+ grow = (address - vma->vm_end) >> PAGE_SHIFT;
+
+ error = acct_stack_growth(vma, size, grow);
+ if (!error)
+ vma->vm_end = address;
+ }
anon_vma_unlock(vma);
return error;
}
@@ -1528,7 +1534,6 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
int expand_stack(struct vm_area_struct *vma, unsigned long address)
{
int error;
- unsigned long size, grow;
/*
* We must make sure the anon_vma is allocated
@@ -1544,13 +1549,20 @@ int expand_stack(struct vm_area_struct *vma, unsigned long address)
* anon_vma lock to serialize against concurrent expand_stacks.
*/
address &= PAGE_MASK;
- size = vma->vm_end - address;
- grow = (vma->vm_start - address) >> PAGE_SHIFT;
+ error = 0;
+
+ /* Somebody else might have raced and expanded it already */
+ if (address < vma->vm_start) {
+ unsigned long size, grow;
- error = acct_stack_growth(vma, size, grow);
- if (!error) {
- vma->vm_start = address;
- vma->vm_pgoff -= grow;
+ size = vma->vm_end - address;
+ grow = (vma->vm_start - address) >> PAGE_SHIFT;
+
+ error = acct_stack_growth(vma, size, grow);
+ if (!error) {
+ vma->vm_start = address;
+ vma->vm_pgoff -= grow;
+ }
}
anon_vma_unlock(vma);
return error;
@@ -1858,6 +1870,16 @@ asmlinkage long sys_munmap(unsigned long addr, size_t len)
return ret;
}
+static inline void verify_mm_writelocked(struct mm_struct *mm)
+{
+#ifdef CONFIG_DEBUG_KERNEL
+ if (unlikely(down_read_trylock(&mm->mmap_sem))) {
+ WARN_ON(1);
+ up_read(&mm->mmap_sem);
+ }
+#endif
+}
+
/*
* this is really a simplified "do_mmap". it only handles
* anonymous maps. eventually we may be able to do some
@@ -1891,6 +1913,12 @@ unsigned long do_brk(unsigned long addr, unsigned long len)
}
/*
+ * mm->mmap_sem is required to protect against another thread
+ * changing the mappings in case we sleep.
+ */
+ verify_mm_writelocked(mm);
+
+ /*
* Clear old maps. this also does some error checking for us
*/
munmap_back:
generated by cgit v1.2.3 (git 2.46.0) at 2025-12-08 13:10:30 +0000