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2006-07-14[PATCH] Convert idr's internal locking to _irqsave variantRoland Dreier1-6/+10
Currently, the code in lib/idr.c uses a bare spin_lock(&idp->lock) to do internal locking. This is a nasty trap for code that might call idr functions from different contexts; for example, it seems perfectly reasonable to call idr_get_new() from process context and idr_remove() from interrupt context -- but with the current locking this would lead to a potential deadlock. The simplest fix for this is to just convert the idr locking to use spin_lock_irqsave(). In particular, this fixes a very complicated locking issue detected by lockdep, involving the ib_ipoib driver's priv->lock and dev->_xmit_lock, which get involved with the ib_sa module's query_idr.lock. Cc: Arjan van de Ven <arjan@infradead.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Zach Brown <zach.brown@oracle.com>, Signed-off-by: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26[PATCH] lib: add idr_replaceJeff Mahoney1-0/+43
This patch adds idr_replace() to replace an existing pointer in a single operation. Device-mapper will use this to update the pointer it stored against a given id. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-25[PATCH] fix race in idr codeSonny Rao1-4/+12
I ran into a bug where the kernel died in the idr code: cpu 0x1d: Vector: 300 (Data Access) at [c000000b7096f710] pc: c0000000001f8984: .idr_get_new_above_int+0x140/0x330 lr: c0000000001f89b4: .idr_get_new_above_int+0x170/0x330 sp: c000000b7096f990 msr: 800000000000b032 dar: 0 dsisr: 40010000 current = 0xc000000b70d43830 paca = 0xc000000000556900 pid = 2022, comm = hwup 1d:mon> t [c000000b7096f990] c0000000000d2ad8 .expand_files+0x2e8/0x364 (unreliable) [c000000b7096faa0] c0000000001f8bf8 .idr_get_new_above+0x18/0x68 [c000000b7096fb20] c00000000002a054 .init_new_context+0x5c/0xf0 [c000000b7096fbc0] c000000000049dc8 .copy_process+0x91c/0x1404 [c000000b7096fcd0] c00000000004a988 .do_fork+0xd8/0x224 [c000000b7096fdc0] c00000000000ebdc .sys_clone+0x5c/0x74 [c000000b7096fe30] c000000000008950 .ppc_clone+0x8/0xc
2005-10-30[PATCH] Whitespace and CodingStyle cleanup for lib/idr.cJesper Juhl1-18/+17
Cleanup trailing whitespace, blank lines, CodingStyle issues etc, for lib/idr.c Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-28[PATCH] gfp_t: lib/*Al Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-23[PATCH] inotify/idr leak fixAndrew Morton1-0/+13
Fix a bug which was reported and diagnosed by Stefan Jones <stefan.jones@churchillrandoms.co.uk> IDR trees include a cache of idr_layer objects. There's no way to destroy this cache, so when we discard an overall idr tree we end up leaking some memory. Add and use idr_destroy() for this. v9fs and infiniband also need to use idr_destroy() to avoid leaks. Or, we make the cache global, like radix_tree_preload(). Which is probably better. Later. Cc: Eric Van Hensbergen <ericvh@ericvh.myip.org> Cc: Roland Dreier <rolandd@cisco.com> Cc: Robert Love <rml@novell.com> Cc: John McCutchan <ttb@tentacle.dhs.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-26[PATCH] Document idr_get_new_above() semantics, update inotifyJohn McCutchan1-1/+1
There is an off by one problem with idr_get_new_above. The comment and function name suggest that it will return an id > starting_id, but it actually returned an id >= starting_id, and kernel callers other than inotify treated it as such. The patch below fixes the comment, and fixes inotifys usage. The function name still doesn't match the behaviour, but it never did. Signed-off-by: John McCutchan <ttb@tentacle.dhs.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-21[PATCH] coverity: idr_get_new_above_int() overrun fixZaur Kambarov1-1/+1
This patch fixes overrun of array pa: 92 struct idr_layer *pa[MAX_LEVEL]; in 98 l = idp->layers; 99 pa[l--] = NULL; by passing idp->layers, set in 202 idp->layers = layers; to function sub_alloc in 203 v = sub_alloc(idp, ptr, &id); Signed-off-by: Zaur Kambarov <zkambarov@coverity.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-16Linux-2.6.12-rc2v2.6.12-rc2Linus Torvalds1-0/+408
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!