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module_param: split perm field into flags and perm

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Impact: cleanup

Rather than hack KPARAM_KMALLOCED into the perm field, separate it out.
Since the perm field was 32 bits and only needs 16, we don't add bloat.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2009-06-12 21:46:56 -06:00
parent 9a71af2c36
commit 45fcc70c0b
2 changed files with 9 additions and 8 deletions
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9
kernel/params.c
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@@ -24,9 +24,6 @@
#include <linux/err.h>
#include <linux/slab.h>
/* We abuse the high bits of "perm" to record whether we kmalloc'ed. */
#define KPARAM_KMALLOCED 0x80000000
#if 0
#define DEBUGP printk
#else
@@ -220,13 +217,13 @@ int param_set_charp(const char *val, struct kernel_param *kp)
return -ENOSPC;
}
if (kp->perm & KPARAM_KMALLOCED)
if (kp->flags & KPARAM_KMALLOCED)
kfree(*(char **)kp->arg);
/* This is a hack. We can't need to strdup in early boot, and we
* don't need to; this mangled commandline is preserved. */
if (slab_is_available()) {
kp->perm |= KPARAM_KMALLOCED;
kp->flags |= KPARAM_KMALLOCED;
*(char **)kp->arg = kstrdup(val, GFP_KERNEL);
if (!kp->arg)
return -ENOMEM;
@@ -591,7 +588,7 @@ void destroy_params(const struct kernel_param *params, unsigned num)
unsigned int i;
for (i = 0; i < num; i++)
if (params[i].perm & KPARAM_KMALLOCED)
if (params[i].flags & KPARAM_KMALLOCED)
kfree(*(char **)params[i].arg);
}