Commit d6a9642b authored Jun 10, 2021 by Joerg Roedel

iommu/vt-d: Fix linker error on 32-bit



A recent commit broke the build on 32-bit x86. The linker throws these
messages:

	ld: drivers/iommu/intel/perf.o: in function `dmar_latency_snapshot':
	perf.c:(.text+0x40c): undefined reference to `__udivdi3'
	ld: perf.c:(.text+0x458): undefined reference to `__udivdi3'

The reason are the 64-bit divides in dmar_latency_snapshot(). Use the
div_u64() helper function for those.

Fixes: 55ee5e67 ("iommu/vt-d: Add common code for dmar latency performance monitors")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20210610083120.29224-1-joro@8bytes.org

parent 7a0f06c1

drivers/iommu/intel/perf.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -141,14 +141,14 @@ int dmar_latency_snapshot(struct intel_iommu iommu, char str, size_t size)
		if (val == UINT_MAX)
		val = 0;
		else
		val /= 1000;
		val = div_u64(val, 1000);
		break;
		case COUNTS_MAX:
		val /= 1000;
		val = div_u64(val, 1000);
		break;
		case COUNTS_SUM:
		if (lstat[i].samples)
		val /= (lstat[i].samples * 1000);
		val = div_u64(val, (lstat[i].samples * 1000));
		else
		val = 0;
		break;