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The commit ("iommu/mediatek: Enlarge the validate PA range
for 4GB mode") introduce the following build warning while ARCH=arm:
drivers/iommu/mtk_iommu.c: In function 'mtk_iommu_iova_to_phys':
include/linux/bitops.h:6:24: warning: left shift count >= width
of type [-Wshift-count-overflow]
#define BIT(nr) (1UL << (nr))
^
>> drivers/iommu/mtk_iommu.c:407:9: note: in expansion of macro 'BIT'
pa |= BIT(32);
drivers/iommu/mtk_iommu.c: In function 'mtk_iommu_probe':
include/linux/bitops.h:6:24: warning: left shift count >= width
of type [-Wshift-count-overflow]
#define BIT(nr) (1UL << (nr))
^
drivers/iommu/mtk_iommu.c:589:35: note: in expansion of macro 'BIT'
data->enable_4GB = !!(max_pfn > (BIT(32) >> PAGE_SHIFT));
Use BIT_ULL instead of BIT.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.