Remove kmalloc call in handling writes to lparcfg

There are only 4 valid name=value pairs for writes to /proc/ppc64/lparcfg. Current code allocates a buffer to copy this information in from the user. Since the longest name=value pair will easily fit into a buffer of 64 characters, simply put the buffer on the stack instead of allocating the buffer.

NOTE: This patch applies on top of the CMO patches.

---

Index: linux-2.6.git/arch/powerpc/kernel/lparcfg.c
===================================================================
@@ -573,29 +573,27 @@

static ssize_t lparcfg_write(struct file *file, const char __user * buf,
size_t count, loff_t * off)
{
- char *kbuf;
+ int kbuf_sz = 64;

+	char kbuf[kbuf_sz];
	char *tmp;
	u64 new_entitled, *new_entitled_ptr = &new_entitled;
	u8 new_weight, *new_weight_ptr = &new_weight;

- ssize_t retval = -ENOMEM;
+ ssize_t retval;

	if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
			firmware_has_feature(FW_FEATURE_ISERIES))
		return -EINVAL;

- kbuf = kmalloc(count, GFP_KERNEL);
- if (!kbuf)
- goto out;
+ if (count > kbuf_sz)
+ return -EINVAL;

- retval = -EFAULT;
if (copy_from_user(kbuf, buf, count))
- goto out;
+ return -EFAULT;

-	retval = -EINVAL;
	kbuf[count - 1] = '\0';
	tmp = strchr(kbuf, '=');
	if (!tmp)

- goto out;
+ return -EINVAL;

	*tmp++ = '\0';

@@ -603,32 +601,32 @@

		char *endp;
		*new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
		if (endp == tmp)

- goto out;
+ return -EINVAL;

		retval = update_ppp(new_entitled_ptr, NULL);
	} else if (!strcmp(kbuf, "capacity_weight")) {
		char *endp;
		*new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
		if (endp == tmp)

- goto out;
+ return -EINVAL;

		retval = update_ppp(NULL, new_weight_ptr);
	} else if (!strcmp(kbuf, "entitled_memory")) {
		char *endp;
		*new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
		if (endp == tmp)

- goto out;
+ return -EINVAL;

		retval = update_mpp(new_entitled_ptr, NULL);
	} else if (!strcmp(kbuf, "entitled_memory_weight")) {
		char *endp;
		*new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
		if (endp == tmp)

- goto out;
+ return -EINVAL;

		retval = update_mpp(NULL, new_weight_ptr);
	} else

- goto out;
+ return -EINVAL;

	if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
		retval = count;
@@ -644,8 +642,6 @@
		retval = -EIO;
	}

-out:

-	kfree(kbuf);
	return retval;
}