Merge branch 'pstore-efi' of git://git.kernel.org/pub/scm/linux/kerne…

…l/git/aegl/linux-2.6

* 'pstore-efi' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
  efivars: Introduce PSTORE_EFI_ATTRIBUTES
  efivars: Use string functions in pstore_write
  efivars: introduce utf16_strncmp
  efivars: String functions
  efi: Add support for using efivars as a pstore backend
  pstore: Allow the user to explicitly choose a backend
  pstore: Make "part" unsigned
  pstore: Add extra context for writes and erases
  pstore: Extend API for more flexibility in new backends

Documentation/ABI/testing/pstore

@@ -39,3 +39,9 @@ Description:	Generic interface to platform dependent persistent storage.
 		multiple) files based on the record size of the underlying
 		persistent storage until at least this amount is reached.
 		Default is 10 Kbytes.
+
+		Pstore only supports one backend at a time. If multiple
+		backends are available, the preferred backend may be
+		set by passing the pstore.backend= argument to the kernel at
+		boot time.
+

Documentation/kernel-parameters.txt

@@ -2153,6 +2153,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			[HW,MOUSE] Controls Logitech smartscroll autorepeat.
 			0 = disabled, 1 = enabled (default).
 
+	pstore.backend=	Specify the name of the pstore backend to use
+
 	pt.		[PARIDE]
 			See Documentation/blockdev/paride.txt.
 

drivers/acpi/apei/erst.c

@@ -932,8 +932,11 @@ static int erst_check_table(struct acpi_table_erst *erst_tab)
 static int erst_open_pstore(struct pstore_info *psi);
 static int erst_close_pstore(struct pstore_info *psi);
 static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
-		       struct timespec *time);
-static u64 erst_writer(enum pstore_type_id type, size_t size);
+			   struct timespec *time, struct pstore_info *psi);
+static u64 erst_writer(enum pstore_type_id type, unsigned int part,
+		       size_t size, struct pstore_info *psi);
+static int erst_clearer(enum pstore_type_id type, u64 id,
+			struct pstore_info *psi);
 
 static struct pstore_info erst_info = {
 	.owner		= THIS_MODULE,
@@ -942,7 +945,7 @@ static struct pstore_info erst_info = {
 	.close		= erst_close_pstore,
 	.read		= erst_reader,
 	.write		= erst_writer,
-	.erase		= erst_clear
+	.erase		= erst_clearer
 };
 
 #define CPER_CREATOR_PSTORE						\
@@ -983,7 +986,7 @@ static int erst_close_pstore(struct pstore_info *psi)
 }
 
 static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
-		       struct timespec *time)
+			   struct timespec *time, struct pstore_info *psi)
 {
 	int rc;
 	ssize_t len = 0;
@@ -1037,7 +1040,8 @@ static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
 	return (rc < 0) ? rc : (len - sizeof(*rcd));
 }
 
-static u64 erst_writer(enum pstore_type_id type, size_t size)
+static u64 erst_writer(enum pstore_type_id type, unsigned int part,
+		       size_t size, struct pstore_info *psi)
 {
 	struct cper_pstore_record *rcd = (struct cper_pstore_record *)
 					(erst_info.buf - sizeof(*rcd));
@@ -1080,6 +1084,12 @@ static u64 erst_writer(enum pstore_type_id type, size_t size)
 	return rcd->hdr.record_id;
 }
 
+static int erst_clearer(enum pstore_type_id type, u64 id,
+			struct pstore_info *psi)
+{
+	return erst_clear(id);
+}
+
 static int __init erst_init(void)
 {
 	int rc = 0;