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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2017-11-08 11:18:29 +0100 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2017-11-08 22:11:20 +0100 |
| commit | ead7a22e9b6eff225afb127f8835a1d3da271a89 (patch) | |
| tree | 296023c7e837c5cfecc4f0ee935232161e9472ae /arch/s390/mm | |
| parent | 8bc1e4ec79c0fcd48ff8914566fe960c34f27bc2 (diff) | |
| download | linux-ead7a22e9b6eff225afb127f8835a1d3da271a89.tar.bz2 | |
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>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/init.c | 4 | ||||
| -rw-r--r-- | arch/s390/mm/vmem.c | 14 |
2 files changed, 9 insertions, 9 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 3b567838b905..a26fb8ee4a6b 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -144,8 +144,8 @@ void __init mem_init(void) void free_initmem(void) { - __set_memory((unsigned long) _sinittext, - (_einittext - _sinittext) >> PAGE_SHIFT, + __set_memory((unsigned long)_sinittext, + (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT, SET_MEMORY_RW | SET_MEMORY_NX); free_initmem_default(POISON_FREE_INITMEM); } diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index f890f2ad951b..24671beb2def 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -402,17 +402,17 @@ 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, + __set_memory((unsigned long)_stext, + (unsigned long)(_etext - _stext) >> PAGE_SHIFT, SET_MEMORY_RO | SET_MEMORY_X); - __set_memory((unsigned long) _etext, - (__end_rodata - _etext) >> PAGE_SHIFT, + __set_memory((unsigned long)_etext, + (unsigned long)(__end_rodata - _etext) >> PAGE_SHIFT, SET_MEMORY_RO); - __set_memory((unsigned long) _sinittext, - (_einittext - _sinittext) >> PAGE_SHIFT, + __set_memory((unsigned long)_sinittext, + (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); } /* |