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| author | Petr Tesarik <petr.tesarik.ext@huawei.com> | 2023-04-06 17:35:39 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2023-04-06 17:45:12 +0300 |
| commit | bbb73a103fbbed6f63cb738d3783261c4241b4b2 (patch) | |
| tree | 084e78c946e80c5b74853c298d73e35c38186656 /tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/EventClass.py | |
| parent | 0eee5ae1025699ea93d44fdb6ef2365505082103 (diff) | |
| download | linux-bbb73a103fbbed6f63cb738d3783261c4241b4b2.tar.xz | |
swiotlb: fix a braino in the alignment check fix
The alignment mask in swiotlb_do_find_slots() masks off the high
bits which are not relevant for the alignment, so multiple
requirements are combined with a bitwise OR rather than AND.
In plain English, the stricter the alignment, the more bits must
be set in iotlb_align_mask.
Confusion may arise from the fact that the same variable is also
used to mask off the offset within a swiotlb slot, which is
achieved with a bitwise AND.
Fixes: 0eee5ae10256 ("swiotlb: fix slot alignment checks")
Reported-by: Dexuan Cui <decui@microsoft.com>
Link: https://lore.kernel.org/all/CAA42JLa1y9jJ7BgQvXeUYQh-K2mDNHd2BYZ4iZUz33r5zY7oAQ@mail.gmail.com/
Reported-by: Kelsey Steele <kelseysteele@linux.microsoft.com>
Link: https://lore.kernel.org/all/20230405003549.GA21326@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net/
Signed-off-by: Petr Tesarik <petr.tesarik.ext@huawei.com>
Tested-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/EventClass.py')
0 files changed, 0 insertions, 0 deletions