linux-toradex.git/include/linux/cpumask.h, branch v2.6.20.8

[PATCH] bitmap: parse input from kernel and user buffers

2006-10-11T18:14:22+00:00

lib/bitmap.c:bitmap_parse() is a library function that received as input a
user buffer.  This seemed to have originated from the way the write_proc
function of the /proc filesystem operates.

This has been reworked to not use kmalloc and eliminates a lot of
get_user() overhead by performing one access_ok before using __get_user().

We need to test if we are in kernel or user space (is_user) and access the
buffer differently.  We cannot use __get_user() to access kernel addresses
in all cases, for example in architectures with separate address space for
kernel and user.

This function will be useful for other uses as well; for example, taking
input for /sysfs instead of /proc, so it was changed to accept kernel
buffers.  We have this use for the Linux UWB project, as part as the
upcoming bandwidth allocator code.

Only a few routines used this function and they were changed too.

Signed-off-by: Reinette Chatre 
Signed-off-by: Inaky Perez-Gonzalez 
Cc: Paul Jackson 
Cc: Joe Korty 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] for_each_cpu_mask() warning fix

2006-06-25T17:01:12+00:00

On UP, this:

       cpumask_t mask = node_to_cpumask(numa_node_id());

       for_each_cpu_mask(cpu, mask)

does this:

mm/readahead.c: In function `node_readahead_aging':
mm/readahead.c:850: warning: unused variable `mask'

which is unpleasantly fixed by this:

Acked-by: Paul Jackson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] remove for_each_cpu()

2006-06-25T17:00:54+00:00

Convert a few stragglers over to for_each_possible_cpu(), remove
for_each_cpu().

Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] for_each_possible_cpu: defines for_each_possible_cpu

2006-03-28T17:16:04+00:00

for_each_cpu() is a for-loop over cpu_possible_map.  for_each_online_cpu is
for-loop cpu over cpu_online_map.  .....for_each_cpu() is not sufficiently
explicit and can lead to mistakes.

This patch adds for_each_possible_cpu() in preparation for the removal of
for_each_cpu().

Signed-off-by: KAMEZAWA Hiroyuki 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] cpumask: uninline any_online_cpu()

2006-03-25T16:23:00+00:00

           text    data     bss     dec     hex filename
before: 3605597 1363528  363328 5332453  515de5 vmlinux
after:  3605295 1363612  363200 5332107  515c8b vmlinux

218 bytes saved.

Also, optimise any_online_cpu() out of existence on CONFIG_SMP=n.

This function seems inefficient.  Can't we simply AND the two masks, then use
find_first_bit()?

Cc: Paul Jackson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] cpumask: uninline highest_possible_processor_id()

2006-03-25T16:23:00+00:00

Shrinks the only caller (net/bridge/netfilter/ebtables.c) by 174 bytes.

Also, optimise highest_possible_processor_id() out of existence on
CONFIG_SMP=n.

Cc: Paul Jackson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] cpumask: uninline next_cpu()

2006-03-25T16:22:59+00:00

           text    data     bss     dec     hex filename
before: 3488027 1322496  360128 5170651  4ee5db vmlinux
after:  3485112 1322480  359968 5167560  4ed9c8 vmlinux

2931 bytes saved

Cc: Paul Jackson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] cpumask: uninline first_cpu()

2006-03-25T16:22:59+00:00

           text    data     bss     dec     hex filename
before: 3490577 1322408  360000 5172985  4eeef9 vmlinux
after:  3488027 1322496  360128 5170651  4ee5db vmlinux

Cc: Paul Jackson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] x86: don't initialise cpu_possible_map to all ones

2006-02-10T16:13:12+00:00

Initialising cpu_possible_map to all-ones with CONFIG_HOTPLUG_CPU means that

a) All for_each_cpu() loops will iterate across all NR_CPUS CPUs, rather
   than over possible ones.  That can be quite expensive.

b) Soon we'll be allocating per-cpu areas only for possible CPUs.  So with
   CPU_MASK_ALL, we'll be wasting memory.

I also switched voyager over to not use CPU_MASK_ALL in the non-CPU-hotplug
case.  Should be OK..

I note that parisc is also using CPU_MASK_ALL.  Suggest that it stop doing
that.

Cc: James Bottomley 
Cc: Kyle McMartin 
Cc: Paul Jackson 
Cc: Ashok Raj 
Cc: Zwane Mwaikambo 
Cc: Paul Jackson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] remove bogus asm/bug.h includes.

2006-02-08T01:56:35+00:00

A bunch of asm/bug.h includes are both not needed (since it will get
pulled anyway) and bogus (since they are done too early).  Removed.

Signed-off-by: Al Viro