On Tue, Jul 05, 2011 at 01:32:11AM +0200, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rjw@xxxxxxx> > Subject: ACPI: Fix lockdep false positives in acpi_power_off() > > All ACPICA locks are allocated and initialized by the same function, > acpi_os_create_lock(), with the help of a local variable called > "lock". Thus, when lockdep is enabled, it uses "lock" as the > name of all those locks and regards them as instances of the same > lock, which causes it to report possible locking problems with them > when there aren't any. > > To work around this problem, define acpi_os_create_lock() as a macro > and make it pass its argument to spin_lock_init(), so that lockdep > uses it as the name of the new lock. Define this macron in a > Linux-specific file to minimize the resulting modifications of > the OS-independent ACPICA parts. > > This change is based on an earlier patch from Andrea Righi and it > addresses a regression from 2.6.39 tracked as > https://bugzilla.kernel.org/show_bug.cgi?id=38152 > > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> > Reported-by: Borislav Petkov <bp@xxxxxxxxx> > Tested-by: Andrea Righi <andrea@xxxxxxxxxxxxxxx> Tested-by: Borislav Petkov <bp@xxxxxxxxx> -- Regards/Gruss, Boris. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
