diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7442edbcabfc3..cf3907d21d097 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1476,6 +1476,16 @@ config RELOCATABLE
 	  relocation pass at runtime even if the kernel is loaded at the
 	  same address it was linked at.
 
+config RELR
+	bool "Use RELR relocation packing"
+	depends on RELOCATABLE && TOOLS_SUPPORT_RELR
+	default y
+	help
+	  Store the kernel's dynamic relocations in the RELR relocation packing
+	  format. Requires a compatible linker (currently only LLD supports
+	  this feature), as well as compatible NM and OBJCOPY utilities
+	  (llvm-nm and llvm-objcopy are compatible).
+
 config RANDOMIZE_BASE
 	bool "Randomize the address of the kernel image"
 	select ARM64_MODULE_PLTS if MODULES
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index bb1f1dbb34e8f..11f84450c7784 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -22,6 +22,10 @@ LDFLAGS_vmlinux		+= -shared -Bsymbolic -z notext -z norelro \
 			$(call ld-option, --no-apply-dynamic-relocs)
 endif
 
+ifeq ($(CONFIG_RELR),y)
+  LDFLAGS_vmlinux += --pack-dyn-relocs=relr
+endif
+
 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
   ifeq ($(call ld-option, --fix-cortex-a53-843419),)
 $(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 2cdacd1c141b9..cc23302e9d95e 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -102,6 +102,8 @@ pe_header:
 	 *  x23        stext() .. start_kernel()  physical misalignment/KASLR offset
 	 *  x28        __create_page_tables()     callee preserved temp register
 	 *  x19/x20    __primary_switch()         callee preserved temp registers
+	 *  x24        __primary_switch() .. relocate_kernel()
+	 *                                        current RELR displacement
 	 */
 ENTRY(stext)
 	bl	preserve_boot_args
@@ -834,14 +836,93 @@ __relocate_kernel:
 
 0:	cmp	x9, x10
 	b.hs	1f
-	ldp	x11, x12, [x9], #24
-	ldr	x13, [x9, #-8]
-	cmp	w12, #R_AARCH64_RELATIVE
+	ldp	x12, x13, [x9], #24
+	ldr	x14, [x9, #-8]
+	cmp	w13, #R_AARCH64_RELATIVE
 	b.ne	0b
-	add	x13, x13, x23			// relocate
-	str	x13, [x11, x23]
+	add	x14, x14, x23			// relocate
+	str	x14, [x12, x23]
 	b	0b
-1:	ret
+
+1:
+#ifdef CONFIG_RELR
+	/*
+	 * Apply RELR relocations.
+	 *
+	 * RELR is a compressed format for storing relative relocations. The
+	 * encoded sequence of entries looks like:
+	 * [ AAAAAAAA BBBBBBB1 BBBBBBB1 ... AAAAAAAA BBBBBB1 ... ]
+	 *
+	 * i.e. start with an address, followed by any number of bitmaps. The
+	 * address entry encodes 1 relocation. The subsequent bitmap entries
+	 * encode up to 63 relocations each, at subsequent offsets following
+	 * the last address entry.
+	 *
+	 * The bitmap entries must have 1 in the least significant bit. The
+	 * assumption here is that an address cannot have 1 in lsb. Odd
+	 * addresses are not supported. Any odd addresses are stored in the RELA
+	 * section, which is handled above.
+	 *
+	 * Excluding the least significant bit in the bitmap, each non-zero
+	 * bit in the bitmap represents a relocation to be applied to
+	 * a corresponding machine word that follows the base address
+	 * word. The second least significant bit represents the machine
+	 * word immediately following the initial address, and each bit
+	 * that follows represents the next word, in linear order. As such,
+	 * a single bitmap can encode up to 63 relocations in a 64-bit object.
+	 *
+	 * In this implementation we store the address of the next RELR table
+	 * entry in x9, the address being relocated by the current address or
+	 * bitmap entry in x13 and the address being relocated by the current
+	 * bit in x14.
+	 *
+	 * Because addends are stored in place in the binary, RELR relocations
+	 * cannot be applied idempotently. We use x24 to keep track of the
+	 * currently applied displacement so that we can correctly relocate if
+	 * __relocate_kernel is called twice with non-zero displacements (i.e.
+	 * if there is both a physical misalignment and a KASLR displacement).
+	 */
+	ldr	w9, =__relr_offset		// offset to reloc table
+	ldr	w10, =__relr_size		// size of reloc table
+	add	x9, x9, x11			// __va(.relr)
+	add	x10, x9, x10			// __va(.relr) + sizeof(.relr)
+
+	sub	x15, x23, x24			// delta from previous offset
+	cbz	x15, 7f				// nothing to do if unchanged
+	mov	x24, x23			// save new offset
+
+2:	cmp	x9, x10
+	b.hs	7f
+	ldr	x11, [x9], #8
+	tbnz	x11, #0, 3f			// branch to handle bitmaps
+	add	x13, x11, x23
+	ldr	x12, [x13]			// relocate address entry
+	add	x12, x12, x15
+	str	x12, [x13], #8			// adjust to start of bitmap
+	b	2b
+
+3:	mov	x14, x13
+4:	lsr	x11, x11, #1
+	cbz	x11, 6f
+	tbz	x11, #0, 5f			// skip bit if not set
+	ldr	x12, [x14]			// relocate bit
+	add	x12, x12, x15
+	str	x12, [x14]
+
+5:	add	x14, x14, #8			// move to next bit's address
+	b	4b
+
+6:	/*
+	 * Move to the next bitmap's address. 8 is the word size, and 63 is the
+	 * number of significant bits in a bitmap entry.
+	 */
+	add	x13, x13, #(8 * 63)
+	b	2b
+
+7:
+#endif
+	ret
+
 ENDPROC(__relocate_kernel)
 #endif
 
@@ -854,6 +935,9 @@ __primary_switch:
 	adrp	x1, init_pg_dir
 	bl	__enable_mmu
 #ifdef CONFIG_RELOCATABLE
+#ifdef CONFIG_RELR
+	mov	x24, #0				// no RELR displacement yet
+#endif
 	bl	__relocate_kernel
 #ifdef CONFIG_RANDOMIZE_BASE
 	ldr	x8, =__primary_switched
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 7fa0083749078..31716afa30f65 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -200,6 +200,15 @@ SECTIONS
 	__rela_offset	= ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR);
 	__rela_size	= SIZEOF(.rela.dyn);
 
+#ifdef CONFIG_RELR
+	.relr.dyn : ALIGN(8) {
+		*(.relr.dyn)
+	}
+
+	__relr_offset	= ABSOLUTE(ADDR(.relr.dyn) - KIMAGE_VADDR);
+	__relr_size	= SIZEOF(.relr.dyn);
+#endif
+
 	. = ALIGN(SEGMENT_ALIGN);
 	__initdata_end = .;
 	__init_end = .;
diff --git a/init/Kconfig b/init/Kconfig
index 99da78db04405..a148c795fde39 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -30,6 +30,9 @@ config CC_CAN_LINK
 config CC_HAS_ASM_GOTO
 	def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC))
 
+config TOOLS_SUPPORT_RELR
+	def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
+
 config CC_HAS_WARN_MAYBE_UNINITIALIZED
 	def_bool $(cc-option,-Wmaybe-uninitialized)
 	help
diff --git a/scripts/tools-support-relr.sh b/scripts/tools-support-relr.sh
new file mode 100755
index 0000000000000..97a2c844a95e4
--- /dev/null
+++ b/scripts/tools-support-relr.sh
@@ -0,0 +1,16 @@
+#!/bin/sh -eu
+# SPDX-License-Identifier: GPL-2.0
+
+tmp_file=$(mktemp)
+trap "rm -f $tmp_file.o $tmp_file $tmp_file.bin" EXIT
+
+cat << "END" | "$CC" -c -x c - -o $tmp_file.o >/dev/null 2>&1
+void *p = &p;
+END
+"$LD" $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr -o $tmp_file
+
+# Despite printing an error message, GNU nm still exits with exit code 0 if it
+# sees a relr section. So we need to check that nothing is printed to stderr.
+test -z "$("$NM" $tmp_file 2>&1 >/dev/null)"
+
+"$OBJCOPY" -O binary $tmp_file $tmp_file.bin
