linux-stable.git/include/linux/kernel.h, branch linux-2.6.24.y

printk: add KERN_CONT annotation

2007-10-17T15:43:01+00:00

printk: add the KERN_CONT annotation (which is empty string but via
which checkpatch.pl can notice that the lacking KERN_ level is fine).
This useful for multiple calls of hand-crafted printk output done by
early debug code or similar.

Signed-off-by: Ingo Molnar 
Cc: Andy Whitcroft 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Make the pr_*() family of macros in kernel.h complete

2007-10-17T15:42:57+00:00

Other/Some pr_*() macros are already defined in kernel.h, but pr_err() was
defined multiple times in several other places

Signed-off-by: Emil Medve 
Cc: Jean Delvare 
Cc: Jeff Garzik 
Cc: "Antonino A. Daplas" 
Cc: Tony Lindgren 
Reviewed-by: Satyam Sharma 
Acked-by: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

printk: add interfaces for external access to the log buffer

2007-10-17T15:42:50+00:00

Add two new functions for reading the kernel log buffer.  The intention is for
them to be used by recovery/dump/debug code so the kernel log can be easily
retrieved/parsed in a crash scenario, but they are generic enough for other
people to dream up other fun uses.

[akpm@linux-foundation.org: buncha fixes]
Signed-off-by: Mike Frysinger 
Cc: Robin Getz 
Cc: Greg Ungerer 
Cc: Russell King 
Cc: Paul Mundt 
Acked-by: Tim Bird 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memory unplug: page offline

2007-10-16T16:43:02+00:00

Logic.
 - set all pages in  [start,end)  as isolated migration-type.
   by this, all free pages in the range will be not-for-use.
 - Migrate all LRU pages in the range.
 - Test all pages in the range's refcnt is zero or not.

Todo:
 - allocate migration destination page from better area.
 - confirm page_count(page)== 0 && PageReserved(page) page is safe to be freed..
 (I don't like this kind of page but..
 - Find out pages which cannot be migrated.
 - more running tests.
 - Use reclaim for unplugging other memory type area.

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

[BLOCK] Move sector_div() from blkdev.h to kernel.h

2007-10-12T10:40:38+00:00

We need it even if CONFIG_BLOCK is disabled, so move it outside of
the block layer include system.

Signed-off-by: Jens Axboe

PTR_ALIGN

2007-09-12T00:21:20+00:00

The AdvanSys driver wants to align some pointers, and the ALIGN macro
doesn't work for pointers.  Rather than try to make it work, add a new
PTR_ALIGN macro which is typesafe.

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

hex_dump: add missing "const" qualifiers

2007-08-11T22:47:41+00:00

Add missing "const" qualifiers to the print_hex_dump_bytes() library routines.

(akpm: rumoured to fix some compile warning somewhere)

Signed-off-by: Alan Stern 
Cc: Artem Bityutskiy 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

hexdump: use const notation

2007-08-09T15:34:23+00:00

Trivial fix: mark the buffer to hexdump as const so callers could avoid
casting their const buffers when calling print_hex_dump().

The patch is really trivial and I suggest to consider it as a fix
(it fixes GCC warnings) and push it to current tree.

Signed-off-by: Artem Bityutskiy 
Signed-off-by: Linus Torvalds

x86: Support attribute((cold)) in gcc 4.3

2007-07-22T01:37:08+00:00

gcc 4.3 supports a new __attribute__((__cold__)) to mark functions cold. Any
path directly leading to a call of this function will be unlikely. And gcc
will try to generate smaller code for the function itself.

Please use with care. The code generation advantage isn't large and in most
cases it is not worth uglifying code with this.

This patch marks some common error functions like panic(), printk()
as cold.  This will longer term make many unlikely()s unnecessary, although
we can keep them for now for older compilers.

BUG is not marked cold because there is currently no way to tell
gcc to mark a inline function told.

Also all __init and __exit functions are marked cold. With a non -Os
build this will tell the compiler to generate slightly smaller code
for them. I think it currently only uses less alignments for labels,
but that might change in the future.

One disadvantage over *likely() is that they cannot be easily instrumented
to verify them.

Another drawback is that only the latest gcc 4.3 snapshots support this.
Unfortunately we cannot detect this using the preprocessor. This means older
snapshots will fail now. I don't think that's a problem because they are
unreleased compilers that nobody should be using.

gcc also has a __hot__ attribute, but I don't see any sense in using
this in the kernel right now. But someday I hope gcc will be able
to use more aggressive optimizing for hot functions even in -Os,
if that happens it should be added.

Includes compile fix from Thomas Gleixner.

Cc: Jan Hubicka 
Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

Report that kernel is tainted if there was an OOPS

2007-07-17T17:23:02+00:00

If the kernel OOPSed or BUGed then it probably should be considered as
tainted.  Thus, all subsequent OOPSes and SysRq dumps will report the
tainted kernel.  This saves a lot of time explaining oddities in the
calltraces.

Signed-off-by: Pavel Emelianov 
Acked-by: Randy Dunlap 
Cc: 
Signed-off-by: Andrew Morton 
[ Added parisc patch from Matthew Wilson  -Linus ]
Signed-off-by: Linus Torvalds