linux/include, branch v2.6.18.2

[PATCH] vmscan: Fix temp_priority race

2006-11-04T01:33:50Z

The temp_priority field in zone is racy, as we can walk through a reclaim path, and just before we copy it into prev_priority, it can be overwritten (say with DEF_PRIORITY) by another reclaimer. The same bug is contained in both try_to_free_pages and balance_pgdat, but it is fixed slightly differently. In balance_pgdat, we keep a separate priority record per zone in a local array. In try_to_free_pages there is no need to do this, as the priority level is the same for all zones that we reclaim from. Impact of this bug is that temp_priority is copied into prev_priority, and setting this artificially high causes reclaimers to set distress artificially low. They then fail to reclaim mapped pages, when they are, in fact, under severe memory pressure (their priority may be as low as 0). This causes the OOM killer to fire incorrectly. From: Andrew Morton __zone_reclaim() isn't modifying zone->prev_priority. But zone->prev_priority is used in the decision whether or not to bring mapped pages onto the inactive list. Hence there's a risk here that __zone_reclaim() will fail because zone->prev_priority ir large (ie: low urgency) and lots of mapped pages end up stuck on the active list. Fix that up by decreasing (ie making more urgent) zone->prev_priority as __zone_reclaim() scans the zone's pages. This bug perhaps explains why ZONE_RECLAIM_PRIORITY was created. It should be possible to remove that now, and to just start out at DEF_PRIORITY? Cc: Nick Piggin Cc: Christoph Lameter Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Chris Wright [chrisw: minor wiggle to fit -stable]

[PATCH] Reintroduce NODES_SPAN_OTHER_NODES for powerpc

2006-11-04T01:33:49Z

Revert "[PATCH] Remove SPAN_OTHER_NODES config definition" This reverts commit f62859bb6871c5e4a8e591c60befc8caaf54db8c. Revert "[PATCH] mm: remove arch independent NODES_SPAN_OTHER_NODES" This reverts commit a94b3ab7eab4edcc9b2cb474b188f774c331adf7. Also update the comments to indicate that this is still required and where its used. Signed-off-by: Andy Whitcroft Cc: Paul Mackerras Cc: Mike Kravetz Cc: Benjamin Herrenschmidt Acked-by: Mel Gorman Acked-by: Will Schmidt Cc: Christoph Lameter Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Chris Wright

[PATCH] fix missing ifdefs in syscall classes hookup for generic targets

2006-11-04T01:33:48Z

several targets have no ....at() family and m32r calls its only chown variant chown32(), with __NR_chown being undefined. creat(2) is also absent in some targets. Signed-off-by: Al Viro Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman Signed-off-by: Chris Wright

[PATCH] SERIAL: Fix oops when removing suspended serial port

2006-11-04T01:33:46Z

[SERIAL] Fix oops when removing suspended serial port A serial card might have been removed when the system is resumed. This results in a suspended port being shut down, which results in the ports shutdown method being called twice in a row. This causes BUGs. Avoid this by tracking the suspended state separately from the initialised state. Signed-off-by: Russell King Signed-off-by: maximilian attems Signed-off-by: Greg Kroah-Hartman Signed-off-by: Chris Wright

[PATCH] __div64_32 for 31 bit.

2006-11-04T01:33:44Z

The clocksource infrastructure introduced with commit ad596171ed635c51a9eef829187af100cbf8dcf7 broke 31 bit s390. The reason is that the do_div() primitive for 31 bit always had a restriction: it could only divide an unsigned 64 bit integer by an unsigned 31 bit integer. The clocksource code now uses do_div() with a base value that has the most significant bit set. The result is that clock->cycle_interval has a funny value which causes the linux time to jump around like mad. The solution is "obvious": implement a proper __div64_32 function for 31 bit s390. Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman Signed-off-by: Chris Wright

scx200_hrt: fix precedence bug manifesting as 27x clock in 1 MHz mode

2006-10-13T20:23:28Z

Fix paren-placement / precedence bug breaking initialization for 1 MHz clock mode. Also fix comment spelling error, and fence-post (off-by-one) error on symbol used in request_region. Addresses http://bugzilla.kernel.org/show_bug.cgi?id=7242 Thanks alexander.krause@erazor-zone.de, dzpost@dedekind.net, for the reports and patch test, and phelps@mantara.com for the independent patch and verification. Signed-off-by: Jim Cromie Cc: Cc: Cc: Acked-by: John Stultz Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman

cpu to node relationship fixup: map cpu to node

2006-10-13T20:23:26Z

Assume that a cpu is *physically* offlined at boot time... Because smpboot.c::smp_boot_cpu_map() canoot find cpu's sapicid, numa.c::build_cpu_to_node_map() cannot build cpu<->node map for offlined cpu. For such cpus, cpu_to_node map should be fixed at cpu-hot-add. This mapping should be done before cpu onlining. This patch also handles cpu hotremove case. Signed-off-by: KAMEZAWA Hiroyuki Cc: Tony Luck Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman

powerpc: fix building gdb against asm/ptrace.h

2006-10-13T20:23:25Z

Ulrich Weigand found a bug with the current version of the asm-powerpc/ptrace.h that prevents building at least the SPU target version of gdb, since some ptrace opcodes are not defined. The problem seems to have originated in the merging of 32 and 64 bit versions of that file, the problem is that some opcodes are only valid on 64 bit kernels, but are also used by 32 bit programs, so they can't depends on the __powerpc64__ symbol. Signed-off-by: Arnd Bergmann Signed-off-by: David Woodhouse Signed-off-by: Greg Kroah-Hartman

Remove offsetof() from user-visible

2006-10-13T20:23:24Z

It's not used by anything user-visible, and it make g++ unhappy. Signed-off-by: David Woodhouse Signed-off-by: Greg Kroah-Hartman

Clean up exported headers on CRIS

2006-10-13T20:23:24Z

This fixes most of the issues with exported headers on CRIS, although we do still need to deal with the asm/arch symlink. Signed-off-by: David Woodhouse Signed-off-by: Greg Kroah-Hartman