[PATCH] ARM: add helpful message when truncating physical memory
From: Russell King <hidden>
Date: 2015-07-01 21:45:54
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
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 <redacted> --- arch/arm/mm/mmu.c | 6 ++++++ 1 file changed, 6 insertions(+)
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; /*
--
2.1.0