* Arnd Bergmann | 2016-07-15 09:07:20 [+0200]:
Cc linux-rt-users@vger.kernel.org, let's have a look at the individual warnings:
thanks.
Warnings Summary: 5 9 ../kernel/sched/core.c:3473:12: warning: 'preemptible_lazy' defined but not used [-Wunused-function]
This was introduced by the rt patchset, I'd suggest adding a fix to the next v4.4-rt release. This is almost certainly harmless.
has been adressed in 4.6.4-rt8 and is harmless.
2 ../include/linux/spinlock.h:246:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
I'm missing context here, so I don't know what caused it, but the warning is not present in v4.4.12 (without -rt), so it's worth looking into.
the full log:
|In file included from include/linux/seqlock.h:35:0, | from include/linux/time.h:5, | from include/uapi/linux/timex.h:56, | from include/linux/timex.h:56, | from include/linux/sched.h:19, | from arch/arm64/include/asm/compat.h:25, | from arch/arm64/include/asm/stat.h:23, | from include/linux/stat.h:5, | from include/linux/module.h:10, | from drivers/tty/serial/amba-pl011.c:37: |drivers/tty/serial/amba-pl011.c: In function ‘pl011_console_write’: |include/linux/spinlock.h:246:3: warning: ‘flags’ may be used uninitialized in this function [-Wmaybe-uninitialized] | _raw_spin_unlock_irqrestore(lock, flags); \ | ^ |drivers/tty/serial/amba-pl011.c:2065:16: note: ‘flags’ was declared here | unsigned long flags; | ^
and relevant part of the source: |pl011_console_write(struct console *co, const char *s, unsigned int count) |{ … | unsigned long flags; | int locked = 1; | … | if (uap->port.sysrq) | locked = 0; | else if (oops_in_progress) | locked = spin_trylock_irqsave(&uap->port.lock, flags); | else | spin_lock_irqsave(&uap->port.lock, flags); … | if (locked) | spin_unlock_irqrestore(&uap->port.lock, flags); … |}
looks like a false positive to me.
Arnd
Sebastian