FAILED: patch "[PATCH] riscv/mm: Add XIP_FIXUP for riscv_pfn_base" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From ca0cb9a60f6d86d4b2139c6f393a78f39edcd7cb Mon Sep 17 00:00:00 2001
From: Palmer Dabbelt <[email protected]>
Date: Fri, 4 Feb 2022 13:14:08 -0800
Subject: [PATCH] riscv/mm: Add XIP_FIXUP for riscv_pfn_base

This manifests as a crash early in boot on VexRiscv.

index eecfacac2cc5..c27294128e18 100644
@@ -232,6 +232,7 @@ static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAG
 
 #ifdef CONFIG_XIP_KERNEL
 #define pt_ops			(*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
+#define riscv_pfn_base         (*(unsigned long  *)XIP_FIXUP(&riscv_pfn_base))
 #define trampoline_pg_dir      ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
 #define fixmap_pte             ((pte_t *)XIP_FIXUP(fixmap_pte))
 #define early_pg_dir           ((pgd_t *)XIP_FIXUP(early_pg_dir))