--- zzzz-none-000/linux-5.4.213/arch/arm/mm/mmu.c	2022-09-15 10:04:56.000000000 +0000
+++ alder-5690pro-762/linux-5.4.213/arch/arm/mm/mmu.c	2024-08-14 09:01:28.000000000 +0000
@@ -29,6 +29,7 @@
 #include <asm/traps.h>
 #include <asm/procinfo.h>
 #include <asm/memory.h>
+#include <asm/kasan_def.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -62,7 +63,7 @@
 #define CPOLICY_WRITEALLOC	4
 
 static unsigned int cachepolicy __initdata = CPOLICY_WRITEBACK;
-static unsigned int ecc_mask __initdata = 0;
+static unsigned int ecc_mask __initdata;
 pgprot_t pgprot_user;
 pgprot_t pgprot_kernel;
 pgprot_t pgprot_hyp_device;
@@ -123,7 +124,7 @@
 };
 
 #ifdef CONFIG_CPU_CP15
-static unsigned long initial_pmd_value __initdata = 0;
+static unsigned long initial_pmd_value __initdata;
 
 /*
  * Initialise the cache_policy variable with the initial state specified
@@ -186,6 +187,7 @@
 
 	if (selected != cachepolicy) {
 		unsigned long cr = __clear_cr(cache_policies[selected].cr_mask);
+
 		cachepolicy = selected;
 		flush_cache_all();
 		set_cr(cr);
@@ -197,6 +199,7 @@
 static int __init early_nocache(char *__unused)
 {
 	char *p = "buffered";
+
 	pr_warn("nocache is deprecated; use cachepolicy=%s\n", p);
 	early_cachepolicy(p);
 	return 0;
@@ -206,6 +209,7 @@
 static int __init early_nowrite(char *__unused)
 {
 	char *p = "uncached";
+
 	pr_warn("nowb is deprecated; use cachepolicy=%s\n", p);
 	early_cachepolicy(p);
 	return 0;
@@ -242,9 +246,9 @@
 
 #endif /* ifdef CONFIG_CPU_CP15 / else */
 
-#define PROT_PTE_DEVICE		L_PTE_PRESENT|L_PTE_YOUNG|L_PTE_DIRTY|L_PTE_XN
+#define PROT_PTE_DEVICE		(L_PTE_PRESENT|L_PTE_YOUNG|L_PTE_DIRTY|L_PTE_XN)
 #define PROT_PTE_S2_DEVICE	PROT_PTE_DEVICE
-#define PROT_SECT_DEVICE	PMD_TYPE_SECT|PMD_SECT_AP_WRITE
+#define PROT_SECT_DEVICE	(PMD_TYPE_SECT|PMD_SECT_AP_WRITE)
 
 static struct mem_type mem_types[] __ro_after_init = {
 	[MT_DEVICE] = {		  /* Strongly ordered / ARMv6 shared device */
@@ -672,6 +676,7 @@
 
 	for (i = 0; i < 16; i++) {
 		pteval_t v = pgprot_val(protection_map[i]);
+
 		protection_map[i] = __pgprot(v | user_pgprot);
 	}
 
@@ -711,6 +716,7 @@
 
 	for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
 		struct mem_type *t = &mem_types[i];
+
 		if (t->prot_l1)
 			t->prot_l1 |= PMD_DOMAIN(t->domain);
 		if (t->prot_sect)
@@ -1176,7 +1182,7 @@
 }
 early_param("vmalloc", early_vmalloc);
 
-phys_addr_t arm_lowmem_limit __initdata = 0;
+phys_addr_t arm_lowmem_limit __initdata;
 
 void __init adjust_lowmem_bounds(void)
 {
@@ -1289,8 +1295,25 @@
 	/*
 	 * Clear out all the mappings below the kernel image.
 	 */
+#ifdef CONFIG_KASAN
+	/*
+	 * KASan's shadow memory inserts itself between the TASK_SIZE
+	 * and MODULES_VADDR. Do not clear the KASan shadow memory mappings.
+	 */
+	for (addr = 0; addr < KASAN_SHADOW_START; addr += PMD_SIZE)
+		pmd_clear(pmd_off_k(addr));
+	/*
+	 * Skip over the KASan shadow area. KASAN_SHADOW_END is sometimes
+	 * equal to MODULES_VADDR and then we exit the pmd clearing. If we
+	 * are using a thumb-compiled kernel, there there will be 8MB more
+	 * to clear as KASan always offset to 16 MB below MODULES_VADDR.
+	 */
+	for (addr = KASAN_SHADOW_END; addr < MODULES_VADDR; addr += PMD_SIZE)
+		pmd_clear(pmd_off_k(addr));
+#else
 	for (addr = 0; addr < MODULES_VADDR; addr += PMD_SIZE)
 		pmd_clear(pmd_off_k(addr));
+#endif
 
 #ifdef CONFIG_XIP_KERNEL
 	/* The XIP kernel is mapped in the module area -- skip over it */