ANDROID: pstore: Use vmalloc for large allocations due to ramoops size

Android uses a 1 MiB console ramoops region, which requires kmalloc
to be changed to vmalloc in the following places:

1. pstore_mkfile(), allocation of inode->i_private
2. ramoops_pstore_read(), allocation of buf

Bug: 67383905
Change-Id: Ie4f355a5991b7cb6ad356ded7bd9d41630602bf5
Signed-off-by: Siqi Lin <siqilin@google.com>

fs/pstore/inode.c

@@ -37,6 +37,7 @@
 #include <linux/spinlock.h>
 #include <linux/uaccess.h>
 #include <linux/syslog.h>
+#include <linux/vmalloc.h>
 
 #include "internal.h"
 
@@ -217,7 +218,7 @@ static void pstore_evict_inode(struct inode *inode)
 		spin_lock_irqsave(&allpstore_lock, flags);
 		list_del(&p->list);
 		spin_unlock_irqrestore(&allpstore_lock, flags);
-		kfree(p);
+		vfree(p);
 	}
 }
 
@@ -329,7 +330,7 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
 		goto fail;
 	inode->i_mode = S_IFREG | 0444;
 	inode->i_fop = &pstore_file_operations;
-	private = kmalloc(sizeof *private + size, GFP_KERNEL);
+	private = vmalloc(sizeof *private + size);
 	if (!private)
 		goto fail_alloc;
 	private->type = type;
@@ -407,7 +408,7 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
 
 fail_lockedalloc:
 	mutex_unlock(&d_inode(root)->i_mutex);
-	kfree(private);
+	vfree(private);
 fail_alloc:
 	iput(inode);
 

fs/pstore/platform.c

@@ -36,6 +36,7 @@
 #include <linux/hardirq.h>
 #include <linux/jiffies.h>
 #include <linux/workqueue.h>
+#include <linux/vmalloc.h>
 
 #include "internal.h"
 
@@ -580,7 +581,7 @@ void pstore_get_records(int quiet)
 							big_oops_buf_sz);
 
 			if (unzipped_len > 0) {
-				kfree(buf);
+				vfree(buf);
 				buf = big_oops_buf;
 				size = unzipped_len;
 				compressed = false;
@@ -594,7 +595,7 @@ void pstore_get_records(int quiet)
 				  compressed, (size_t)size, time, psi);
 		if (unzipped_len < 0) {
 			/* Free buffer other than big oops */
-			kfree(buf);
+			vfree(buf);
 			buf = NULL;
 		} else
 			unzipped_len = -1;

fs/pstore/ram.c

@@ -250,7 +250,7 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
 	/* ECC correction notice */
 	ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
 
-	*buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL);
+	*buf = vmalloc(size + ecc_notice_size + 1);
 	if (*buf == NULL)
 		return -ENOMEM;