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module: struct module_ref should contains long fields

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module_ref contains two "unsigned int" fields.

Thats now too small, since some machines can open more than 2^32 files.

Check commit 518de9b39e (fs: allow for more than 2^31 files) for
reference.

We can add an aligned(2 * sizeof(unsigned long)) attribute to force
alloc_percpu() allocating module_ref areas in single cache lines.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Rusty Russell <rusty@rustcorp.com.au>
CC: Tejun Heo <tj@kernel.org>
CC: Robin Holt <holt@sgi.com>
CC: David Miller <davem@davemloft.net>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Eric Dumazet 2012-01-13 09:32:14 +10:30 • committed by Rusty Russell
parent 48fd11880b
commit bd77c04772
3 changed files with 21 additions and 10 deletions
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8
kernel/module.c
View file

@ -725,9 +725,9 @@ static int try_stop_module(struct module *mod, int flags, int *forced)
}
}
unsigned int module_refcount(struct module *mod)
unsigned long module_refcount(struct module *mod)
{
unsigned int incs = 0, decs = 0;
unsigned long incs = 0, decs = 0;
int cpu;
for_each_possible_cpu(cpu)
@ -853,7 +853,7 @@ static inline void print_unload_info(struct seq_file *m, struct module *mod)
struct module_use *use;
int printed_something = 0;
seq_printf(m, " %u ", module_refcount(mod));
seq_printf(m, " %lu ", module_refcount(mod));
/* Always include a trailing , so userspace can differentiate
between this and the old multi-field proc format. */
@ -903,7 +903,7 @@ EXPORT_SYMBOL_GPL(symbol_put_addr);
static ssize_t show_refcnt(struct module_attribute *mattr,
struct module_kobject *mk, char *buffer)
{
return sprintf(buffer, "%u\n", module_refcount(mk->mod));
return sprintf(buffer, "%lu\n", module_refcount(mk->mod));
}
static struct module_attribute refcnt = {