pstore/pmsg: drop bounce buffer

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Removing a bounce buffer copy operation in the pmsg driver path is
always better. We also gain in overall performance by not requesting
a vmalloc on every write as this can cause precious RT tasks, such
as user facing media operation, to stall while memory is being
reclaimed. Added a write_buf_user to the pstore functions, a backup
platform write_buf_user that uses the small buffer that is part of
the instance, and implemented a ramoops write_buf_user that only
supports PSTORE_TYPE_PMSG.

Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Signed-off-by: Kees Cook <keescook@chromium.org>

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This commit is contained in:

Mark Salyzyn 2016-09-01 08:13:46 -07:00 • committed by Kees Cook

parent 79d955af71

commit 5bf6d1b927

6 changed files with 119 additions and 36 deletions

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36

fs/pstore/platform.c

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33

fs/pstore/pmsg.c

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19

fs/pstore/ram.c

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47

fs/pstore/ram_core.c

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11

include/linux/pstore.h

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5

include/linux/pstore_ram.h

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