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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2011-01-19 22:27:14 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-20 18:30:17 -0800 |
| commit | 2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e (patch) | |
| tree | 0d7c54159ca8e9c4d4e113597d3c7c08d9f98e84 /kernel | |
| parent | 8d99641f6c1af806cd5d9e6badce91910219a161 (diff) | |
| download | talos-obmc-linux-2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e.tar.gz talos-obmc-linux-2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e.zip | |
ACPI: Introduce acpi_os_ioremap()
Commit ca9b600be38c ("ACPI / PM: Make suspend_nvs_save() use
acpi_os_map_memory()") attempted to prevent the code in osl.c and nvs.c
from using different ioremap() variants by making the latter use
acpi_os_map_memory() for mapping the NVS pages. However, that also
requires acpi_os_unmap_memory() to be used for unmapping them, which
causes synchronize_rcu() to be executed many times in a row
unnecessarily and introduces substantial delays during resume on some
systems.
Instead of using acpi_os_map_memory() for mapping the NVS pages in nvs.c
introduce acpi_os_ioremap() calling ioremap_cache() and make the code in
both osl.c and nvs.c use it.
Reported-by: Jeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions
