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authorKars de Jong <jongk@linux-m68k.org>2023-02-23 12:23:49 +0100
committerGeert Uytterhoeven <geert@linux-m68k.org>2023-03-06 14:09:42 +0100
commit0d9fad91abfd723ea5070a46d98a9f4496c93ba9 (patch)
tree1f8ef0fd73d1370c937ae79ffa0ca76c535b17dd /arch/m68k/mm
parentfe15c26ee26efa11741a7b632e9f23b01aca4cc6 (diff)
m68k: mm: Fix systems with memory at end of 32-bit address space
The calculation of end addresses of memory chunks overflowed to 0 when a memory chunk is located at the end of 32-bit address space. This is the case for the HP300 architecture. Link: https://lore.kernel.org/linux-m68k/CACz-3rhUo5pgNwdWHaPWmz+30Qo9xCg70wNxdf7o5x-6tXq8QQ@mail.gmail.com/ Signed-off-by: Kars de Jong <jongk@linux-m68k.org> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Link: https://lore.kernel.org/r/20230223112349.26675-1-jongk@linux-m68k.org Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/mm')
-rw-r--r--arch/m68k/mm/motorola.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index 2a375637e007..911301224078 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -437,7 +437,7 @@ void __init paging_init(void)
}
min_addr = m68k_memory[0].addr;
- max_addr = min_addr + m68k_memory[0].size;
+ max_addr = min_addr + m68k_memory[0].size - 1;
memblock_add_node(m68k_memory[0].addr, m68k_memory[0].size, 0,
MEMBLOCK_NONE);
for (i = 1; i < m68k_num_memory;) {
@@ -452,21 +452,21 @@ void __init paging_init(void)
}
memblock_add_node(m68k_memory[i].addr, m68k_memory[i].size, i,
MEMBLOCK_NONE);
- addr = m68k_memory[i].addr + m68k_memory[i].size;
+ addr = m68k_memory[i].addr + m68k_memory[i].size - 1;
if (addr > max_addr)
max_addr = addr;
i++;
}
m68k_memoffset = min_addr - PAGE_OFFSET;
- m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6;
+ m68k_virt_to_node_shift = fls(max_addr - min_addr) - 6;
module_fixup(NULL, __start_fixup, __stop_fixup);
flush_icache();
- high_memory = phys_to_virt(max_addr);
+ high_memory = phys_to_virt(max_addr) + 1;
min_low_pfn = availmem >> PAGE_SHIFT;
- max_pfn = max_low_pfn = max_addr >> PAGE_SHIFT;
+ max_pfn = max_low_pfn = (max_addr >> PAGE_SHIFT) + 1;
/* Reserve kernel text/data/bss and the memory allocated in head.S */
memblock_reserve(m68k_memory[0].addr, availmem - m68k_memory[0].addr);