x86/kasan: Rename local CPU_ENTRY_AREA variables to shorten names

Rename the CPU entry area variables in kasan_init() to shorten their
names, a future fix will reference the beginning of the per-CPU portion
of the CPU entry area, and shadow_cpu_entry_per_cpu_begin is a bit much.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Link: https://lkml.kernel.org/r/20221110203504.1985010-4-seanjc@google.com

arch/x86/mm/kasan_init_64.c

@@ -331,7 +331,7 @@ void __init kasan_populate_shadow_for_vaddr(void *va, size_t size, int nid)
 void __init kasan_init(void)
 {
 	int i;
-	void *shadow_cpu_entry_begin, *shadow_cpu_entry_end;
+	void *shadow_cea_begin, *shadow_cea_end;
 
 	memcpy(early_top_pgt, init_top_pgt, sizeof(early_top_pgt));
 
@@ -372,16 +372,16 @@ void __init kasan_init(void)
 		map_range(&pfn_mapped[i]);
 	}
 
-	shadow_cpu_entry_begin = (void *)CPU_ENTRY_AREA_BASE;
-	shadow_cpu_entry_begin = kasan_mem_to_shadow(shadow_cpu_entry_begin);
-	shadow_cpu_entry_begin = (void *)round_down(
-			(unsigned long)shadow_cpu_entry_begin, PAGE_SIZE);
+	shadow_cea_begin = (void *)CPU_ENTRY_AREA_BASE;
+	shadow_cea_begin = kasan_mem_to_shadow(shadow_cea_begin);
+	shadow_cea_begin = (void *)round_down(
+			(unsigned long)shadow_cea_begin, PAGE_SIZE);
 
-	shadow_cpu_entry_end = (void *)(CPU_ENTRY_AREA_BASE +
+	shadow_cea_end = (void *)(CPU_ENTRY_AREA_BASE +
 					CPU_ENTRY_AREA_MAP_SIZE);
-	shadow_cpu_entry_end = kasan_mem_to_shadow(shadow_cpu_entry_end);
-	shadow_cpu_entry_end = (void *)round_up(
-			(unsigned long)shadow_cpu_entry_end, PAGE_SIZE);
+	shadow_cea_end = kasan_mem_to_shadow(shadow_cea_end);
+	shadow_cea_end = (void *)round_up(
+			(unsigned long)shadow_cea_end, PAGE_SIZE);
 
 	kasan_populate_early_shadow(
 		kasan_mem_to_shadow((void *)PAGE_OFFSET + MAXMEM),
@@ -403,9 +403,9 @@ void __init kasan_init(void)
 
 	kasan_populate_early_shadow(
 		kasan_mem_to_shadow((void *)VMALLOC_END + 1),
-		shadow_cpu_entry_begin);
+		shadow_cea_begin);
 
-	kasan_populate_early_shadow(shadow_cpu_entry_end,
+	kasan_populate_early_shadow(shadow_cea_end,
 			kasan_mem_to_shadow((void *)__START_KERNEL_map));
 
 	kasan_populate_shadow((unsigned long)kasan_mem_to_shadow(_stext),