On 06/05/2014 06:19 PM, Pranith Kumar wrote:
use the documented atomic_cmpxchg instead of __cmpxchg64This kills the last user of said API in drivers code. Signed-off-by: Pranith Kumar <bobby.pr...@gmail.com> --- drivers/iommu/intel-iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 6bb3277..270113f 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -293,7 +293,7 @@ static inline u64 dma_pte_addr(struct dma_pte *pte) return pte->val & VTD_PAGE_MASK; #else /* Must have a full atomic 64-bit read */ - return __cmpxchg64(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK; + return atomic_cmpxchg(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK;
This is not equivalent. The __cmpxchg64() is specifically being used in this case when !CONFIG_64BIT for a full 64-bit RMW, whereas atomic_cmpxchg() uses ints which would be 32-bit RMW. Regards, Peter Hurley -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
