Staging
v0.5.1
https://github.com/torvalds/linux
Revision 2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e authored by Rafael J. Wysocki on 19 January 2011, 21:27:14 UTC, committed by Linus Torvalds on 21 January 2011, 02:30:17 UTC
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>
1 parent 8d99641
History
Tip revision: 2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e authored by Rafael J. Wysocki on 19 January 2011, 21:27:14 UTC
ACPI: Introduce acpi_os_ioremap()
Tip revision: 2d6d9fd
File Mode Size
Documentation
arch
block
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.gitignore -rw-r--r-- 936 bytes
.mailmap -rw-r--r-- 4.0 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 91.7 KB
Kbuild -rw-r--r-- 2.4 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 185.5 KB
Makefile -rw-r--r-- 50.9 KB
README -rw-r--r-- 17.1 KB
REPORTING-BUGS -rw-r--r-- 3.3 KB

README

back to top