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authorRussell King <rmk+kernel@arm.linux.org.uk>2015-06-25 10:52:58 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2015-06-29 14:33:31 +0100
commiteeb3fee8f6cca5e7bf1647d9e327c7b40e384578 (patch)
tree15a144989b561303c1f228603e93b9b644686146 /arch/arm/mm
parentb4d103d1a45fed0da2f31c905eb5e053c84a41c6 (diff)
ARM: add helpful message when truncating physical memory
Add a nmessage to suggest that HIGHMEM is enabled when physical memory is truncated due to lack of virtual address space to map it in the low memory mapping. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm')
-rw-r--r--arch/arm/mm/mmu.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 904d1532e6d0..79de062c6077 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1072,6 +1072,7 @@ void __init sanity_check_meminfo(void)
int highmem = 0;
phys_addr_t vmalloc_limit = __pa(vmalloc_min - 1) + 1;
struct memblock_region *reg;
+ bool should_use_highmem = false;
for_each_memblock(memory, reg) {
phys_addr_t block_start = reg->base;
@@ -1090,6 +1091,7 @@ void __init sanity_check_meminfo(void)
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;
}
@@ -1100,6 +1102,7 @@ void __init sanity_check_meminfo(void)
&block_start, &block_end, &vmalloc_limit);
memblock_remove(vmalloc_limit, overlap_size);
block_end = vmalloc_limit;
+ should_use_highmem = true;
}
}
@@ -1134,6 +1137,9 @@ 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;
/*