Merge remote-tracking branch 'qcom_sm8250/lineage-20' into lineage-21

Change-Id: I3159ae2c81329a81f9f6d4feba3fd1324a86b4f6

init/Kconfig

@@ -8,6 +8,23 @@ config DEFCONFIG_LIST
 	default ARCH_DEFCONFIG
 	default "arch/$(ARCH)/defconfig"
 
+config CC_VERSION_TEXT
+	string
+	default "$(CC_VERSION_TEXT)"
+	help
+	  This is used in unclear ways:
+
+	  - Re-run Kconfig when the compiler is updated
+	    The 'default' property references the environment variable,
+	    CC_VERSION_TEXT so it is recorded in include/config/auto.conf.cmd.
+	    When the compiler is updated, Kconfig will be invoked.
+
+	  - Ensure full rebuild when the compier is updated
+	    include/linux/kconfig.h contains this option in the comment line so
+	    fixdep adds include/config/cc/version/text.h into the auto-generated
+	    dependency. When the compiler is updated, syncconfig will touch it
+	    and then every file will be rebuilt.
+
 config CC_IS_GCC
 	def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
 

init/Makefile

@@ -33,4 +33,4 @@ include/generated/compile.h: FORCE
 	@$($(quiet)chk_compile.h)
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@	\
 	"$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)"	\
-	"$(CC) $(KBUILD_CFLAGS)" "$(LD)"
+	$(CONFIG_CC_VERSION_TEXT) "$(LD)"

init/do_mounts.c

@@ -167,6 +167,24 @@ static dev_t devt_from_partuuid(const char *uuid_str)
 	}
 	return res;
 }
+
+/**
+ * match_dev_by_label - callback for finding a partition using its label
+ * @dev:	device passed in by the caller
+ * @data:	opaque pointer to the label to match
+ *
+ * Returns 1 if the device matches, and 0 otherwise.
+ */
+static int match_dev_by_label(struct device *dev, const void *data)
+{
+	const char *label = data;
+	struct hd_struct *part = dev_to_part(dev);
+
+	if (part->info && !strcmp(label, part->info->volname))
+		return 1;
+
+	return 0;
+}
 #endif
 
 /*
@@ -190,6 +208,8 @@ static dev_t devt_from_partuuid(const char *uuid_str)
  *	   a partition with a known unique id.
  *	8) <major>:<minor> major and minor number of the device separated by
  *	   a colon.
+ *	9) PARTLABEL=<name> with name being the GPT partition label.
+ *	   MSDOS partitions do not support labels!
  *
  *	If name doesn't have fall into the categories above, we return (0,0).
  *	block_class is used to check if something is a disk name. If the disk
@@ -211,6 +231,17 @@ dev_t name_to_dev_t(const char *name)
 		if (!res)
 			goto fail;
 		goto done;
+	} else if (strncmp(name, "PARTLABEL=", 10) == 0) {
+		struct device *dev;
+
+		dev = class_find_device(&block_class, NULL, name + 10,
+					&match_dev_by_label);
+		if (!dev)
+			goto fail;
+
+		res = dev->devt;
+		put_device(dev);
+		goto done;
 	}
 #endif