https://git.ruby-lang.org/ruby.git/commit/?id=c4f45674a4

From c4f45674a431560105d1b92c7b64d8b6354d9c6a Mon Sep 17 00:00:00 2001
From: Jemma Issroff <jemmaissroff@g...>
Date: Thu, 4 Feb 2021 16:16:59 -0500
Subject: Removes unused HEAP_PAGE_BITMAP_PLANES constant from gc.c

---
 gc.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/gc.c b/gc.c
index b36688979e8..b2c5ca0a802 100644
--- a/gc.c
+++ b/gc.c
@@ -867,7 +867,6 @@ enum { https://github.com/ruby/ruby/blob/trunk/gc.c#L867
     HEAP_PAGE_OBJ_LIMIT = (unsigned int)((HEAP_PAGE_SIZE - sizeof(struct heap_page_header))/sizeof(struct RVALUE)),
     HEAP_PAGE_BITMAP_LIMIT = CEILDIV(CEILDIV(HEAP_PAGE_SIZE, sizeof(struct RVALUE)), BITS_BITLENGTH),
     HEAP_PAGE_BITMAP_SIZE = (BITS_SIZE * HEAP_PAGE_BITMAP_LIMIT),
-    HEAP_PAGE_BITMAP_PLANES = 4 /* RGENGC: mark, unprotected, uncollectible, marking */
 };
 #define HEAP_PAGE_ALIGN (1 << HEAP_PAGE_ALIGN_LOG)
 #define HEAP_PAGE_SIZE HEAP_PAGE_ALIGN
@@ -13588,7 +13587,6 @@ Init_GC(void) https://github.com/ruby/ruby/blob/trunk/gc.c#L13587
     rb_hash_aset(gc_constants, ID2SYM(rb_intern("RVALUE_SIZE")), SIZET2NUM(sizeof(RVALUE)));
     rb_hash_aset(gc_constants, ID2SYM(rb_intern("HEAP_PAGE_OBJ_LIMIT")), SIZET2NUM(HEAP_PAGE_OBJ_LIMIT));
     rb_hash_aset(gc_constants, ID2SYM(rb_intern("HEAP_PAGE_BITMAP_SIZE")), SIZET2NUM(HEAP_PAGE_BITMAP_SIZE));
-    rb_hash_aset(gc_constants, ID2SYM(rb_intern("HEAP_PAGE_BITMAP_PLANES")), SIZET2NUM(HEAP_PAGE_BITMAP_PLANES));
     rb_hash_aset(gc_constants, ID2SYM(rb_intern("HEAP_PAGE_SIZE")), SIZET2NUM(HEAP_PAGE_SIZE));
     rb_hash_aset(gc_constants, ID2SYM(rb_intern("SIZE_POOL_COUNT")), LONG2FIX(SIZE_POOL_COUNT));
     rb_hash_aset(gc_constants, ID2SYM(rb_intern("RVARGC_MAX_ALLOCATE_SIZE")), LONG2FIX(size_pool_slot_size(SIZE_POOL_COUNT - 1)));
-- 
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