John David Anglin 7633453978 parisc: fixes and cleanups in page cache flushing (1/4) ... This is the first patch in a series of 4, with which the page cache flushing of parisc will gets fixed and enhanced. This even fixes the nasty "minifail" bug (http://wiki.parisc-linux.org/TestCases?highlight=%28minifail%29) which prevented parisc to stay an official debian port. Basically the flush in copy_user_page together with the TLB patch from commit 7139bc1579 is what fixes the minifail bug. This patch still uses the TMPALIAS approach. The new copy_user_page implementation calls flush_dcache_page_asm to flush the user dcache page (crucial for minifail fix) via a kernel TMPALIAS mapping. After that, it just copies the page using the kernel mapping. It does a final flush if needed. Generally it is hard to avoid doing some cache flushes using the kernel mapping (e.g., copy_to_user_page and copy_from_user_page). This patch depends on a subsequent change to pacache.S implementing clear_page_asm and copy_page_asm. These are optimized routines to clear and copy a page. The calls in clear_user_page and copy_user_page could be replaced by calls to memset and memcpy, respectively. I tested prefetch optimizations in clear_page_asm and copy_page_asm but didn't see any significant performance improvement on rp3440. I'm not sure if these are routines are significantly faster than memset and/or memcpy, but they are there for further performance evaluation. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>		2013-02-20 22:49:19 +01:00
..
configs	kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT	2011-01-20 17:02:05 -08:00
hpux	[PARISC] hpux: Remove obsolete regs parameter from do_execve() in hpux_execve()	2013-01-30 13:26:57 +11:00
include	parisc: fixes and cleanups in page cache flushing (1/4)	2013-02-20 22:49:19 +01:00
kernel	parisc: fixes and cleanups in page cache flushing (1/4)	2013-02-20 22:49:19 +01:00
lib	[PARISC] update parisc to use generic strncpy_from_user()	2012-05-31 11:14:37 +01:00
math-emu	parisc: avoid undefined shift in cnv_float.h	2013-01-07 23:06:22 +01:00
mm	parisc: Use generic init_task	2012-05-05 13:00:24 +02:00
oprofile	oprofile: more whitespace fixes	2008-10-15 20:55:51 +02:00
defpalo.conf	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
install.sh	kbuild: use INSTALLKERNEL to select customized installkernel script	2009-09-20 12:18:14 +02:00
Kconfig	parisc: add CONFIG_MLONGCALLS option to enable linkage of huge vmlinux executables	2013-02-20 22:46:57 +01:00
Kconfig.debug	parisc: add strict copy size checks (v2)	2010-03-06 22:54:09 +00:00
Makefile	parisc: add CONFIG_MLONGCALLS option to enable linkage of huge vmlinux executables	2013-02-20 22:46:57 +01:00
nm	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00