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| author | Yabin Cui <yabinc@google.com> | 2019-08-29 14:28:38 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-03 22:01:17 +0200 |
| commit | 13af88f312fc57becacfcbb1cc77f844281a30ec (patch) | |
| tree | 18aac4c7b5bb7c26325f1be6c46f0fb241d3bf85 /lib/packing.c | |
| parent | 89e89b05ef5b58ab33070cc5b59d74ca8cff86fe (diff) | |
| download | linux-13af88f312fc57becacfcbb1cc77f844281a30ec.tar.gz linux-13af88f312fc57becacfcbb1cc77f844281a30ec.tar.bz2 linux-13af88f312fc57becacfcbb1cc77f844281a30ec.zip | |
coresight: tmc-etr: Fix updating buffer in not-snapshot mode.
TMC etr always copies all available data to perf aux buffer, which
may exceed the available space in perf aux buffer. It isn't suitable
for not-snapshot mode, because:
1) It may overwrite previously written data.
2) It may make the perf_event_mmap_page->aux_head report having more
or less data than the reality.
So change to only copy the latest data fitting the available space in
perf aux buffer.
Signed-off-by: Yabin Cui <yabinc@google.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20190829202842.580-14-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/packing.c')
0 files changed, 0 insertions, 0 deletions