x86/boot/e820: Consolidate 'struct e820_entry *entry' local variable names

So the E820 code has a lot of cases of:

	struct e820_entry *ei;

... but the 'ei' name makes very little sense if you think about it, it's
not an abbreviation of anything obviously related to E820 table entries.

This results in weird looking lines such as:

               if (type && ei->type != type)

where you might have to double check what 'ei' really means, plus
weird looking secondary variable names, such as:

	u64 ei_end;

The 'ei' name was introduced in a single function over a decade ago, and
then mindlessly cargo-copied over into other functions - with usage growing
to over 60 uses altogether (!).

( My best guess is that it might have been originally meant as abbreviation
  of 'entry interval'. )

Anyway, rename these to the much more obvious:

	struct e820_entry *entry;

No change in functionality.

Cc: Alex Thorlton <athorlton@sgi.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Jackson <pj@sgi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/e820.c

@@ -73,11 +73,11 @@ int e820_any_mapped(u64 start, u64 end, unsigned type)
 	int i;
 
 	for (i = 0; i < e820_table->nr_entries; i++) {
-		struct e820_entry *ei = &e820_table->entries[i];
+		struct e820_entry *entry = &e820_table->entries[i];
 
-		if (type && ei->type != type)
+		if (type && entry->type != type)
 			continue;
-		if (ei->addr >= end || ei->addr + ei->size <= start)
+		if (entry->addr >= end || entry->addr + entry->size <= start)
 			continue;
 		return 1;
 	}
@@ -96,21 +96,21 @@ int __init e820_all_mapped(u64 start, u64 end, unsigned type)
 	int i;
 
 	for (i = 0; i < e820_table->nr_entries; i++) {
-		struct e820_entry *ei = &e820_table->entries[i];
+		struct e820_entry *entry = &e820_table->entries[i];
 
-		if (type && ei->type != type)
+		if (type && entry->type != type)
 			continue;
 
 		/* Is the region (part) in overlap with the current region? */
-		if (ei->addr >= end || ei->addr + ei->size <= start)
+		if (entry->addr >= end || entry->addr + entry->size <= start)
 			continue;
 
 		/*
 		 * If the region is at the beginning of <start,end> we move
 		 * 'start' to the end of the region since it's ok until there
 		 */
-		if (ei->addr <= start)
-			start = ei->addr + ei->size;
+		if (entry->addr <= start)
+			start = entry->addr + entry->size;
 
 		/*
 		 * If 'start' is now at or beyond 'end', we're done, full
@@ -426,34 +426,34 @@ __e820_update_range(struct e820_table *table, u64 start, u64 size, unsigned old_
 	printk(KERN_CONT "\n");
 
 	for (i = 0; i < table->nr_entries; i++) {
-		struct e820_entry *ei = &table->entries[i];
+		struct e820_entry *entry = &table->entries[i];
 		u64 final_start, final_end;
-		u64 ei_end;
+		u64 entry_end;
 
-		if (ei->type != old_type)
+		if (entry->type != old_type)
 			continue;
 
-		ei_end = ei->addr + ei->size;
+		entry_end = entry->addr + entry->size;
 
 		/* Completely covered by new range? */
-		if (ei->addr >= start && ei_end <= end) {
-			ei->type = new_type;
-			real_updated_size += ei->size;
+		if (entry->addr >= start && entry_end <= end) {
+			entry->type = new_type;
+			real_updated_size += entry->size;
 			continue;
 		}
 
 		/* New range is completely covered? */
-		if (ei->addr < start && ei_end > end) {
+		if (entry->addr < start && entry_end > end) {
 			__e820_add_region(table, start, size, new_type);
-			__e820_add_region(table, end, ei_end - end, ei->type);
-			ei->size = start - ei->addr;
+			__e820_add_region(table, end, entry_end - end, entry->type);
+			entry->size = start - entry->addr;
 			real_updated_size += size;
 			continue;
 		}
 
 		/* Partially covered: */
-		final_start = max(start, ei->addr);
-		final_end = min(end, ei_end);
+		final_start = max(start, entry->addr);
+		final_end = min(end, entry_end);
 		if (final_start >= final_end)
 			continue;
 
@@ -465,11 +465,11 @@ __e820_update_range(struct e820_table *table, u64 start, u64 size, unsigned old_
 		 * Left range could be head or tail, so need to update
 		 * its size first:
 		 */
-		ei->size -= final_end - final_start;
-		if (ei->addr < final_start)
+		entry->size -= final_end - final_start;
+		if (entry->addr < final_start)
 			continue;
 
-		ei->addr = final_end;
+		entry->addr = final_end;
 	}
 	return real_updated_size;
 }
@@ -501,33 +501,33 @@ u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type, int checkty
 	printk(KERN_CONT "\n");
 
 	for (i = 0; i < e820_table->nr_entries; i++) {
-		struct e820_entry *ei = &e820_table->entries[i];
+		struct e820_entry *entry = &e820_table->entries[i];
 		u64 final_start, final_end;
-		u64 ei_end;
+		u64 entry_end;
 
-		if (checktype && ei->type != old_type)
+		if (checktype && entry->type != old_type)
 			continue;
 
-		ei_end = ei->addr + ei->size;
+		entry_end = entry->addr + entry->size;
 
 		/* Completely covered? */
-		if (ei->addr >= start && ei_end <= end) {
-			real_removed_size += ei->size;
-			memset(ei, 0, sizeof(struct e820_entry));
+		if (entry->addr >= start && entry_end <= end) {
+			real_removed_size += entry->size;
+			memset(entry, 0, sizeof(struct e820_entry));
 			continue;
 		}
 
 		/* Is the new range completely covered? */
-		if (ei->addr < start && ei_end > end) {
-			e820_add_region(end, ei_end - end, ei->type);
-			ei->size = start - ei->addr;
+		if (entry->addr < start && entry_end > end) {
+			e820_add_region(end, entry_end - end, entry->type);
+			entry->size = start - entry->addr;
 			real_removed_size += size;
 			continue;
 		}
 
 		/* Partially covered: */
-		final_start = max(start, ei->addr);
-		final_end = min(end, ei_end);
+		final_start = max(start, entry->addr);
+		final_end = min(end, entry_end);
 		if (final_start >= final_end)
 			continue;
 
@@ -537,11 +537,11 @@ u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type, int checkty
 		 * Left range could be head or tail, so need to update
 		 * the size first:
 		 */
-		ei->size -= final_end - final_start;
-		if (ei->addr < final_start)
+		entry->size -= final_end - final_start;
+		if (entry->addr < final_start)
 			continue;
 
-		ei->addr = final_end;
+		entry->addr = final_end;
 	}
 	return real_removed_size;
 }
@@ -697,15 +697,15 @@ void __init e820_mark_nosave_regions(unsigned long limit_pfn)
 	unsigned long pfn = 0;
 
 	for (i = 0; i < e820_table->nr_entries; i++) {
-		struct e820_entry *ei = &e820_table->entries[i];
+		struct e820_entry *entry = &e820_table->entries[i];
 
-		if (pfn < PFN_UP(ei->addr))
-			register_nosave_region(pfn, PFN_UP(ei->addr));
+		if (pfn < PFN_UP(entry->addr))
+			register_nosave_region(pfn, PFN_UP(entry->addr));
 
-		pfn = PFN_DOWN(ei->addr + ei->size);
+		pfn = PFN_DOWN(entry->addr + entry->size);
 
-		if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN)
-			register_nosave_region(PFN_UP(ei->addr), pfn);
+		if (entry->type != E820_RAM && entry->type != E820_RESERVED_KERN)
+			register_nosave_region(PFN_UP(entry->addr), pfn);
 
 		if (pfn >= limit_pfn)
 			break;
@@ -722,10 +722,10 @@ static int __init e820_mark_nvs_memory(void)
 	int i;
 
 	for (i = 0; i < e820_table->nr_entries; i++) {
-		struct e820_entry *ei = &e820_table->entries[i];
+		struct e820_entry *entry = &e820_table->entries[i];
 
-		if (ei->type == E820_NVS)
-			acpi_nvs_register(ei->addr, ei->size);
+		if (entry->type == E820_NVS)
+			acpi_nvs_register(entry->addr, entry->size);
 	}
 
 	return 0;
@@ -770,15 +770,15 @@ static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type)
 	unsigned long max_arch_pfn = MAX_ARCH_PFN;
 
 	for (i = 0; i < e820_table->nr_entries; i++) {
-		struct e820_entry *ei = &e820_table->entries[i];
+		struct e820_entry *entry = &e820_table->entries[i];
 		unsigned long start_pfn;
 		unsigned long end_pfn;
 
-		if (ei->type != type)
+		if (entry->type != type)
 			continue;
 
-		start_pfn = ei->addr >> PAGE_SHIFT;
-		end_pfn = (ei->addr + ei->size) >> PAGE_SHIFT;
+		start_pfn = entry->addr >> PAGE_SHIFT;
+		end_pfn = (entry->addr + entry->size) >> PAGE_SHIFT;
 
 		if (start_pfn >= limit_pfn)
 			continue;
@@ -1155,16 +1155,16 @@ void __init e820__memblock_setup(void)
 	memblock_allow_resize();
 
 	for (i = 0; i < e820_table->nr_entries; i++) {
-		struct e820_entry *ei = &e820_table->entries[i];
+		struct e820_entry *entry = &e820_table->entries[i];
 
-		end = ei->addr + ei->size;
+		end = entry->addr + entry->size;
 		if (end != (resource_size_t)end)
 			continue;
 
-		if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN)
+		if (entry->type != E820_RAM && entry->type != E820_RESERVED_KERN)
 			continue;
 
-		memblock_add(ei->addr, ei->size);
+		memblock_add(entry->addr, entry->size);
 	}
 
 	/* Throw away partial pages: */