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Message-ID: <f24d23310706120647n4e125964i3885bd5c340b8903@mail.gmail.com>
Date: Tue, 12 Jun 2007 19:17:07 +0530
From: "debian developer" <debiandev@...il.com>
To: "Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] lockdep: variuos fixes
What exactly is being copyright'ed here?
On 6/12/07, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> - update the copyright notices
> - use the default hash function
> - fix a thinko in a BUILD_BUG_ON
> - add a WARN_ON to spot inconsitent naming
> - fix a termination issue in /proc/lock_stat
>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Acked-by: Ingo Molnar <mingo@...e.hu>
> ---
> include/linux/lockdep.h | 3 ++-
> kernel/lockdep.c | 20 +++++++++++---------
> kernel/lockdep_proc.c | 6 +++++-
> 3 files changed, 18 insertions(+), 11 deletions(-)
>
> Index: linux-2.6/kernel/lockdep.c
> ===================================================================
> --- linux-2.6.orig/kernel/lockdep.c
> +++ linux-2.6/kernel/lockdep.c
> @@ -5,7 +5,8 @@
> *
> * Started by Ingo Molnar:
> *
> - * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@...hat.com>
> + * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@...hat.com>
> + * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@...hat.com>
> *
> * this code maps all the lock dependencies as they occur in a live kernel
> * and will warn about the following classes of locking bugs:
> @@ -37,6 +38,7 @@
> #include <linux/debug_locks.h>
> #include <linux/irqflags.h>
> #include <linux/utsname.h>
> +#include <linux/hash.h>
>
> #include <asm/sections.h>
>
> @@ -238,8 +240,7 @@ LIST_HEAD(all_lock_classes);
> */
> #define CLASSHASH_BITS (MAX_LOCKDEP_KEYS_BITS - 1)
> #define CLASSHASH_SIZE (1UL << CLASSHASH_BITS)
> -#define CLASSHASH_MASK (CLASSHASH_SIZE - 1)
> -#define __classhashfn(key) ((((unsigned long)key >> CLASSHASH_BITS) + (unsigned long)key) & CLASSHASH_MASK)
> +#define __classhashfn(key) hash_long((unsigned long)key, CLASSHASH_BITS)
> #define classhashentry(key) (classhash_table + __classhashfn((key)))
>
> static struct list_head classhash_table[CLASSHASH_SIZE];
> @@ -250,9 +251,7 @@ static struct list_head classhash_table[
> */
> #define CHAINHASH_BITS (MAX_LOCKDEP_CHAINS_BITS-1)
> #define CHAINHASH_SIZE (1UL << CHAINHASH_BITS)
> -#define CHAINHASH_MASK (CHAINHASH_SIZE - 1)
> -#define __chainhashfn(chain) \
> - (((chain >> CHAINHASH_BITS) + chain) & CHAINHASH_MASK)
> +#define __chainhashfn(chain) hash_long(chain, CHAINHASH_BITS)
> #define chainhashentry(chain) (chainhash_table + __chainhashfn((chain)))
>
> static struct list_head chainhash_table[CHAINHASH_SIZE];
> @@ -680,7 +679,7 @@ look_up_lock_class(struct lockdep_map *l
> * (or spin_lock_init()) call - which acts as the key. For static
> * locks we use the lock object itself as the key.
> */
> - BUILD_BUG_ON(sizeof(struct lock_class_key) > sizeof(struct lock_class));
> + BUILD_BUG_ON(sizeof(struct lock_class_key) > sizeof(struct lockdep_map));
>
> key = lock->key->subkeys + subclass;
>
> @@ -690,9 +689,12 @@ look_up_lock_class(struct lockdep_map *l
> * We can walk the hash lockfree, because the hash only
> * grows, and we are careful when adding entries to the end:
> */
> - list_for_each_entry(class, hash_head, hash_entry)
> - if (class->key == key)
> + list_for_each_entry(class, hash_head, hash_entry) {
> + if (class->key == key) {
> + WARN_ON_ONCE(class->name != lock->name);
> return class;
> + }
> + }
>
> return NULL;
> }
> Index: linux-2.6/include/linux/lockdep.h
> ===================================================================
> --- linux-2.6.orig/include/linux/lockdep.h
> +++ linux-2.6/include/linux/lockdep.h
> @@ -1,7 +1,8 @@
> /*
> * Runtime locking correctness validator
> *
> - * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@...hat.com>
> + * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@...hat.com>
> + * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@...hat.com>
> *
> * see Documentation/lockdep-design.txt for more details.
> */
> Index: linux-2.6/kernel/lockdep_proc.c
> ===================================================================
> --- linux-2.6.orig/kernel/lockdep_proc.c
> +++ linux-2.6/kernel/lockdep_proc.c
> @@ -5,7 +5,8 @@
> *
> * Started by Ingo Molnar:
> *
> - * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@...hat.com>
> + * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@...hat.com>
> + * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@...hat.com>
> *
> * Code for /proc/lockdep and /proc/lockdep_stats:
> *
> @@ -498,6 +499,9 @@ static void *ls_start(struct seq_file *m
> if (data->iter == data->stats)
> seq_header(m);
>
> + if (data->iter == data->iter_end)
> + data->iter = NULL;
> +
> return data->iter;
> }
>
>
> --
>
> -
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