Messages in this thread Patch in this message | | | Date | Tue, 2 Jan 2007 18:38:24 -0500 | From | Dave Jones <> | Subject | Re: Shrink the held_lock struct by using bitfields. |
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On Tue, Jan 02, 2007 at 06:35:58PM -0500, Dave Jones wrote:
Sent the wrong diff. Here's the fixed version...
Shrink the held_lock struct by using bitfields. This shrinks task_struct on lockdep enabled kernels by 480 bytes.
Signed-off-by: Dave Jones <davej@redhat.com>
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index ea097dd..ba81cce 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -175,11 +175,11 @@ struct held_lock { * The following field is used to detect when we cross into an * interrupt context: */ - int irq_context; - int trylock; - int read; - int check; - int hardirqs_off; + unsigned char irq_context:1; + unsigned char trylock:1; + unsigned char read:2; + unsigned char check:1; + unsigned char hardirqs_off:1; }; /* -- http://www.codemonkey.org.uk - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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