forked from Minki/linux
s390: avoid undefined behaviour
At a couple of places smatch emits warnings like this: arch/s390/mm/vmem.c:409 vmem_map_init() warn: right shifting more than type allows In fact shifting a signed type right is undefined. Avoid this and add an unsigned long cast. The shifted values are always positive. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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@ -145,7 +145,7 @@ void __init mem_init(void)
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void free_initmem(void)
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{
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__set_memory((unsigned long)_sinittext,
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(_einittext - _sinittext) >> PAGE_SHIFT,
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(unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
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SET_MEMORY_RW | SET_MEMORY_NX);
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free_initmem_default(POISON_FREE_INITMEM);
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}
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@ -403,16 +403,16 @@ void __init vmem_map_init(void)
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for_each_memblock(memory, reg)
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vmem_add_mem(reg->base, reg->size);
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__set_memory((unsigned long)_stext,
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(_etext - _stext) >> PAGE_SHIFT,
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(unsigned long)(_etext - _stext) >> PAGE_SHIFT,
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SET_MEMORY_RO | SET_MEMORY_X);
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__set_memory((unsigned long)_etext,
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(__end_rodata - _etext) >> PAGE_SHIFT,
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(unsigned long)(__end_rodata - _etext) >> PAGE_SHIFT,
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SET_MEMORY_RO);
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__set_memory((unsigned long)_sinittext,
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(_einittext - _sinittext) >> PAGE_SHIFT,
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(unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
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SET_MEMORY_RO | SET_MEMORY_X);
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pr_info("Write protected kernel read-only data: %luk\n",
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(__end_rodata - _stext) >> 10);
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(unsigned long)(__end_rodata - _stext) >> 10);
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}
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/*
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