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authorRafael J. Wysocki <rjw@sisk.pl>2011-01-19 22:27:14 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-20 18:30:17 -0800
commit2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e (patch)
tree0d7c54159ca8e9c4d4e113597d3c7c08d9f98e84 /kernel
parent8d99641f6c1af806cd5d9e6badce91910219a161 (diff)
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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
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