1 files changed, 94 insertions, 0 deletions
diff --git a/debian/patches-rt/0027-sh-highmem-Remove-all-traces-of-unused-cruft.patch b/debian/patches-rt/0027-sh-highmem-Remove-all-traces-of-unused-cruft.patch
new file mode 100644
index 000000000..bcf3a9b1f
--- /dev/null
+++ b/debian/patches-rt/0027-sh-highmem-Remove-all-traces-of-unused-cruft.patch
@@ -0,0 +1,94 @@
+From 61e1ac8c3bd29dec41ae2f631bb142e26b790de2 Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Tue, 3 Nov 2020 10:27:16 +0100
+Subject: [PATCH 027/323] sh/highmem: Remove all traces of unused cruft
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz
+
+For whatever reasons SH has highmem bits all over the place but does
+not enable it via Kconfig. Remove the bitrot.
+
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+---
+ arch/sh/include/asm/fixmap.h     |  8 --------
+ arch/sh/include/asm/kmap_types.h | 15 ---------------
+ arch/sh/mm/init.c                |  8 --------
+ 3 files changed, 31 deletions(-)
+ delete mode 100644 arch/sh/include/asm/kmap_types.h
+
+diff --git a/arch/sh/include/asm/fixmap.h b/arch/sh/include/asm/fixmap.h
+index f38adc189b83..b07fbc7f7bc6 100644
+--- a/arch/sh/include/asm/fixmap.h
++++ b/arch/sh/include/asm/fixmap.h
+@@ -13,9 +13,6 @@
+ #include <linux/kernel.h>
+ #include <linux/threads.h>
+ #include <asm/page.h>
+-#ifdef CONFIG_HIGHMEM
+-#include <asm/kmap_types.h>
+-#endif
+ 
+ /*
+  * Here we define all the compile-time 'special' virtual
+@@ -53,11 +50,6 @@ enum fixed_addresses {
+ 	FIX_CMAP_BEGIN,
+ 	FIX_CMAP_END = FIX_CMAP_BEGIN + (FIX_N_COLOURS * NR_CPUS) - 1,
+ 
+-#ifdef CONFIG_HIGHMEM
+-	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */
+-	FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1,
+-#endif
+-
+ #ifdef CONFIG_IOREMAP_FIXED
+ 	/*
+ 	 * FIX_IOREMAP entries are useful for mapping physical address
+diff --git a/arch/sh/include/asm/kmap_types.h b/arch/sh/include/asm/kmap_types.h
+deleted file mode 100644
+index b78107f923dd..000000000000
+--- a/arch/sh/include/asm/kmap_types.h
++++ /dev/null
+@@ -1,15 +0,0 @@
+-/* SPDX-License-Identifier: GPL-2.0 */
+-#ifndef __SH_KMAP_TYPES_H
+-#define __SH_KMAP_TYPES_H
+-
+-/* Dummy header just to define km_type. */
+-
+-#ifdef CONFIG_DEBUG_HIGHMEM
+-#define  __WITH_KM_FENCE
+-#endif
+-
+-#include <asm-generic/kmap_types.h>
+-
+-#undef __WITH_KM_FENCE
+-
+-#endif
+diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
+index 3348e0c4d769..0db6919af8d3 100644
+--- a/arch/sh/mm/init.c
++++ b/arch/sh/mm/init.c
+@@ -362,9 +362,6 @@ void __init mem_init(void)
+ 	mem_init_print_info(NULL);
+ 	pr_info("virtual kernel memory layout:\n"
+ 		"    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+-#ifdef CONFIG_HIGHMEM
+-		"    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+-#endif
+ 		"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
+ 		"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
+ #ifdef CONFIG_UNCACHED_MAPPING
+@@ -376,11 +373,6 @@ void __init mem_init(void)
+ 		FIXADDR_START, FIXADDR_TOP,
+ 		(FIXADDR_TOP - FIXADDR_START) >> 10,
+ 
+-#ifdef CONFIG_HIGHMEM
+-		PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
+-		(LAST_PKMAP*PAGE_SIZE) >> 10,
+-#endif
+-
+ 		(unsigned long)VMALLOC_START, VMALLOC_END,
+ 		(VMALLOC_END - VMALLOC_START) >> 20,
+ 
+-- 
+2.43.0
+