linux.git/include/asm-x86/cacheflush.h, branch v2.6.25

x86: include proper prototypes for rodata_test

2008-02-14T22:30:20+00:00

extern should not appear in C files.  Also, the definitions
do not match the prototype currently, not sure what way you
want to go with this, I've switched the prototype to return
int, but I can see going to the void return as well.

Signed-off-by: Harvey Harrison 
Signed-off-by: Ingo Molnar

x86: introduce page pool in cpa

2008-02-09T22:24:09+00:00

DEBUG_PAGEALLOC was not possible on 64-bit due to its early-bootup
hardcoded reliance on PSE pages, and the unrobustness of the runtime
splitup of large pages. The splitup ended in recursive calls to
alloc_pages() when a page for a pte split was requested.

Avoid the recursion with a preallocated page pool, which is used to
split up large mappings and gets refilled in the return path of
kernel_map_pages after the split has been done. The size of the page
pool is adjusted to the available memory.

This part just implements the page pool and the initialization w/o
using it yet.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

x86: fix clflush_page_range logic

2008-01-30T12:34:09+00:00

only present ptes must be flushed.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

x86: add testcases for RODATA and NX protections/attributes

2008-01-30T12:34:08+00:00

Latest update; I now have 4 NX tests, but 2 fail so they're #if 0'd.
I also cleaned up the NX test code quite a bit, and got rid of the ugly
exception table sorting stuff.

From: Arjan van de Ven 

This patch adds testcases for the CONFIG_DEBUG_RODATA configuration option
as well as the NX CPU feature/mappings. Both testcases can move to tests/
once that patch gets merged into mainline.
(I'm half considering moving the rodata test into mm/init.c but I'll
wait with that until init.c is unified)

As part of this I had to fix a not-quite-right alignment in the vmlinux.lds.h
for the RODATA sections, which lead to 1 page less being marked read only.

Signed-off-by: Arjan van de Ven 
Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner

x86: cpa: move flush to cpa

2008-01-30T12:34:07+00:00

The set_memory_* and set_pages_* family of API's currently requires the
callers to do a global tlb flush after the function call; forgetting this is
a very nasty deathtrap. This patch moves the global tlb flush into
each of the callers

Signed-off-by: Arjan van de Ven 
Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner

x86: make various pageattr.c functions static

2008-01-30T12:34:07+00:00

change_page_attr_add is only used in pageattr.c now, so we can
make this function static.
change_page_attr() isn't used anywere at all anymore; this function
is a really bad API anyway so just remove the bloat entirely.

Signed-off-by: Arjan van de Ven 
Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner

x86: cpa: set_memory_notpresent()

2008-01-30T12:34:07+00:00

Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner

x86: deprecate change_page_attr() for drivers

2008-01-30T12:34:06+00:00

With the introduction of the new API, no driver or non-archcore code needs
to use c-p-a anymore, so this patch also deprecates the EXPORT_SYMBOL of CPA
(it's a horrible API after all).

Signed-off-by: Arjan van de Ven 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

x86: a new API for drivers/etc to control cache and other page attributes

2008-01-30T12:34:06+00:00

Right now, if drivers or other code want to change, say, a cache attribute of a
page, the only API they have is change_page_attr(). c-p-a is a really bad API
for this, because it forces the caller to know *ALL* the attributes he wants
for the page, not just the 1 thing he wants to change. So code that wants to
set a page uncachable, needs to be aware of the NX status as well etc etc etc.

This patch introduces a set of new APIs for this, set_pages_ and
set_memory_, that offer a logical change to the user, and leave all
attributes not implied by the requested logical change alone.

Signed-off-by: Arjan van de Ven 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

x86: do not PSE on CONFIG_DEBUG_PAGEALLOC=y

2008-01-30T12:33:58+00:00

get more testing of the c_p_a() code done by not turning off
PSE on DEBUG_PAGEALLOC.

this simplifies the early pagetable setup code, and tests
the largepage-splitup code quite heavily.

In the end, all the largepages will be split up pretty quickly,
so there's no difference to how DEBUG_PAGEALLOC worked before.

Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner