iommufd/selftest: Fix iommufd_test_dirty() to handle <u8 bitmaps

BugLink: https://bugs.launchpad.net/bugs/2083196

[ Upstream commit 9560393b830b415b2151b3dd8e065257cccbffa7 ]

The calculation returns 0 if it sets less than the number of bits per
byte. For calculating memory allocation from bits, lets round it up to
one byte.

Link: https://lore.kernel.org/r/20240627110105.62325-3-joao.m.martins@oracle.com
Reported-by: Matt Ochs <mochs@nvidia.com>
Fixes: a9af47e382 ("iommufd/selftest: Test IOMMU_HWPT_GET_DIRTY_BITMAP")
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Matt Ochs <mochs@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>

This commit is contained in:

Joao Martins

2024-06-27 12:00:56 +01:00

committed by

Mehmet Basaran

parent 48a66e1c0e

commit 259aca1b11

1 changed files with 1 additions and 1 deletions

									
										drivers/iommu/iommufd/selftest.c
									
		+1
		-1
	
												View File
												
				@@ -1334,7 +1334,7 @@ static int iommufd_test_dirty(struct iommufd_ucmd *ucmd, unsigned int mockpt_id,

					}

					max = length / page_size;

					bitmap_size = max / BITS_PER_BYTE;

					bitmap_size = DIV_ROUND_UP(max, BITS_PER_BYTE);

					tmp = kvzalloc(bitmap_size, GFP_KERNEL_ACCOUNT);

					if (!tmp) {