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-rw-r--r--arch/arm/kernel/setup.c4
-rw-r--r--arch/arm/mm/mmu.c66
-rw-r--r--arch/arm/mm/nommu.c8
3 files changed, 30 insertions, 48 deletions
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 34e3f3c45634..8a8051cf57d1 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -81,7 +81,7 @@ __setup("fpe=", fpe_setup);
extern void init_default_cache_policy(unsigned long);
extern void paging_init(const struct machine_desc *desc);
extern void early_paging_init(const struct machine_desc *);
-extern void sanity_check_meminfo(void);
+extern void adjust_lowmem_bounds(void);
extern enum reboot_mode reboot_mode;
extern void setup_dma_zone(const struct machine_desc *desc);
@@ -1093,7 +1093,7 @@ void __init setup_arch(char **cmdline_p)
setup_dma_zone(mdesc);
xen_early_init();
efi_init();
- sanity_check_meminfo();
+ adjust_lowmem_bounds();
arm_memblock_init(mdesc);
early_ioremap_reset();
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 4001dd15818d..b8f70a3bb7f8 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1152,13 +1152,11 @@ early_param("vmalloc", early_vmalloc);
phys_addr_t arm_lowmem_limit __initdata = 0;
-void __init sanity_check_meminfo(void)
+void __init adjust_lowmem_bounds(void)
{
phys_addr_t memblock_limit = 0;
- int highmem = 0;
u64 vmalloc_limit;
struct memblock_region *reg;
- bool should_use_highmem = false;
/*
* Let's use our own (unoptimized) equivalent of __pa() that is
@@ -1172,43 +1170,18 @@ void __init sanity_check_meminfo(void)
for_each_memblock(memory, reg) {
phys_addr_t block_start = reg->base;
phys_addr_t block_end = reg->base + reg->size;
- phys_addr_t size_limit = reg->size;
- if (reg->base >= vmalloc_limit)
- highmem = 1;
- else
- size_limit = vmalloc_limit - reg->base;
-
-
- if (!IS_ENABLED(CONFIG_HIGHMEM) || cache_is_vipt_aliasing()) {
-
- if (highmem) {
- pr_notice("Ignoring RAM at %pa-%pa (!CONFIG_HIGHMEM)\n",
- &block_start, &block_end);
- memblock_remove(reg->base, reg->size);
- should_use_highmem = true;
- continue;
- }
-
- if (reg->size > size_limit) {
- phys_addr_t overlap_size = reg->size - size_limit;
-
- pr_notice("Truncating RAM at %pa-%pa",
- &block_start, &block_end);
- block_end = vmalloc_limit;
- pr_cont(" to -%pa", &block_end);
- memblock_remove(vmalloc_limit, overlap_size);
- should_use_highmem = true;
- }
- }
-
- if (!highmem) {
- if (block_end > arm_lowmem_limit) {
- if (reg->size > size_limit)
- arm_lowmem_limit = vmalloc_limit;
- else
- arm_lowmem_limit = block_end;
- }
+ if (reg->base < vmalloc_limit) {
+ if (block_end > arm_lowmem_limit)
+ /*
+ * Compare as u64 to ensure vmalloc_limit does
+ * not get truncated. block_end should always
+ * fit in phys_addr_t so there should be no
+ * issue with assignment.
+ */
+ arm_lowmem_limit = min_t(u64,
+ vmalloc_limit,
+ block_end);
/*
* Find the first non-pmd-aligned page, and point
@@ -1233,9 +1206,6 @@ void __init sanity_check_meminfo(void)
}
}
- if (should_use_highmem)
- pr_notice("Consider using a HIGHMEM enabled kernel.\n");
-
high_memory = __va(arm_lowmem_limit - 1) + 1;
/*
@@ -1248,6 +1218,18 @@ void __init sanity_check_meminfo(void)
if (!memblock_limit)
memblock_limit = arm_lowmem_limit;
+ if (!IS_ENABLED(CONFIG_HIGHMEM) || cache_is_vipt_aliasing()) {
+ if (memblock_end_of_DRAM() > arm_lowmem_limit) {
+ phys_addr_t end = memblock_end_of_DRAM();
+
+ pr_notice("Ignoring RAM at %pa-%pa\n",
+ &memblock_limit, &end);
+ pr_notice("Consider using a HIGHMEM enabled kernel.\n");
+
+ memblock_remove(memblock_limit, end - memblock_limit);
+ }
+ }
+
memblock_set_current_limit(memblock_limit);
}
diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c
index 2740967727e2..13a25d6282f8 100644
--- a/arch/arm/mm/nommu.c
+++ b/arch/arm/mm/nommu.c
@@ -85,7 +85,7 @@ static unsigned long irbar_read(void)
}
/* MPU initialisation functions */
-void __init sanity_check_meminfo_mpu(void)
+void __init adjust_lowmem_bounds_mpu(void)
{
phys_addr_t phys_offset = PHYS_OFFSET;
phys_addr_t aligned_region_size, specified_mem_size, rounded_mem_size;
@@ -274,7 +274,7 @@ void __init mpu_setup(void)
}
}
#else
-static void sanity_check_meminfo_mpu(void) {}
+static void adjust_lowmem_bounds_mpu(void) {}
static void __init mpu_setup(void) {}
#endif /* CONFIG_ARM_MPU */
@@ -295,10 +295,10 @@ void __init arm_mm_memblock_reserve(void)
#endif
}
-void __init sanity_check_meminfo(void)
+void __init adjust_lowmem_bounds(void)
{
phys_addr_t end;
- sanity_check_meminfo_mpu();
+ adjust_lowmem_bounds_mpu();
end = memblock_end_of_DRAM();
high_memory = __va(end - 1) + 1;
memblock_set_current_limit(end);