diff options
Diffstat (limited to 'arch/s390/kernel/setup.c')
| -rw-r--r-- | arch/s390/kernel/setup.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index ae3810c04872..93cf9bce98a1 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -531,14 +531,19 @@ static void __init setup_memory_end(void) { unsigned long vmax, vmalloc_size, tmp; - /* Choose kernel address space layout: 2, 3, or 4 levels. */ + /* Choose kernel address space layout: 3 or 4 levels. */ vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; - tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; - tmp = tmp * (sizeof(struct page) + PAGE_SIZE); - if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) + if (IS_ENABLED(CONFIG_KASAN)) { vmax = _REGION2_SIZE; /* 3-level kernel page table */ - else - vmax = _REGION1_SIZE; /* 4-level kernel page table */ + } else { + tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; + tmp = tmp * (sizeof(struct page) + PAGE_SIZE); + if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) + vmax = _REGION2_SIZE; /* 3-level kernel page table */ + else + vmax = _REGION1_SIZE; /* 4-level kernel page table */ + } + /* module area is at the end of the kernel address space. */ MODULES_END = vmax; MODULES_VADDR = MODULES_END - MODULES_LEN; @@ -556,6 +561,11 @@ static void __init setup_memory_end(void) /* Take care that memory_end is set and <= vmemmap */ memory_end = min(memory_end ?: max_physmem_end, tmp); +#ifdef CONFIG_KASAN + /* fit in kasan shadow memory region between 1:1 and vmemmap */ + memory_end = min(memory_end, KASAN_SHADOW_START); + vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END); +#endif max_pfn = max_low_pfn = PFN_DOWN(memory_end); memblock_remove(memory_end, ULONG_MAX); |