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s390: avoid undefined behaviour

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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>
This commit is contained in:
Heiko Carstens 2017-11-08 11:18:29 +01:00
parent 8bc1e4ec79
commit ead7a22e9b
2 changed files with 9 additions and 9 deletions
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2
arch/s390/mm/init.c
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@ -145,7 +145,7 @@ void __init mem_init(void)
void free_initmem(void)
{
__set_memory((unsigned long)_sinittext,
(_einittext - _sinittext) >> PAGE_SHIFT,
(unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
SET_MEMORY_RW | SET_MEMORY_NX);
free_initmem_default(POISON_FREE_INITMEM);
}

8
arch/s390/mm/vmem.c
View File

@ -403,16 +403,16 @@ void __init vmem_map_init(void)
for_each_memblock(memory, reg)
vmem_add_mem(reg->base, reg->size);
__set_memory((unsigned long)_stext,
(_etext - _stext) >> PAGE_SHIFT,
(unsigned long)(_etext - _stext) >> PAGE_SHIFT,
SET_MEMORY_RO | SET_MEMORY_X);
__set_memory((unsigned long)_etext,
(__end_rodata - _etext) >> PAGE_SHIFT,
(unsigned long)(__end_rodata - _etext) >> PAGE_SHIFT,
SET_MEMORY_RO);
__set_memory((unsigned long)_sinittext,
(_einittext - _sinittext) >> PAGE_SHIFT,
(unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
SET_MEMORY_RO | SET_MEMORY_X);
pr_info("Write protected kernel read-only data: %luk\n",
(__end_rodata - _stext) >> 10);
(unsigned long)(__end_rodata - _stext) >> 10);
}
/*