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Date:   Wed, 6 Apr 2022 09:29:13 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Josh Poimboeuf <jpoimboe@redhat.com>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        kernel test robot <lkp@intel.com>, kbuild-all@lists.01.org,
        linux-kernel@vger.kernel.org, mbenes@suse.cz, x86@kernel.org,
        Steven Rostedt <rostedt@goodmis.org>
Subject: Re: drivers/gpu/drm/i915/i915.prelink.o: warning: objtool:
 __intel_wait_for_register_fw.cold()+0xce: relocation to !ENDBR:
 vlv_allow_gt_wake.cold+0x0
Message-ID: <20220406072913.GC34954@worktop.programming.kicks-ass.net>
References: <202204041241.Hw855BWm-lkp@intel.com>
 <YkxLqznOz0ldTz5a@hirez.programming.kicks-ass.net>
 <20220406000500.5hlaqy5zrdqsg5mg@treble>
 <87czhv11k1.ffs@tglx>
 <20220406053251.6dyfxrjmmgdwocfc@treble>
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On Tue, Apr 05, 2022 at 10:32:51PM -0700, Josh Poimboeuf wrote:
> On Wed, Apr 06, 2022 at 02:46:22AM +0200, Thomas Gleixner wrote:
> > On Tue, Apr 05 2022 at 17:05, Josh Poimboeuf wrote:
> > > On Tue, Apr 05, 2022 at 04:01:15PM +0200, Peter Zijlstra wrote:
> > >
> > > But objtool is complaining about a real problem (albeit with a cryptic
> > > warning).  I don't think we want to paper over that. See patch.
> > >
> > > Also, are in-tree users of trace_printk() even allowed??
> > 
> > See the comment in the header file you are patching:
> > 
> >  * This is intended as a debugging tool for the developer only.
> >  * Please refrain from leaving trace_printks scattered around in
> >  * your code. (Extra memory is used for special buffers that are
> >  * allocated when trace_printk() is used.)
> 
> So what do we do ... send a nastygram?  

Best would be for Steve to send a patch removing them all:


arch/powerpc/kvm/book3s_xics.c:#define XICS_DBG(fmt...) trace_printk(fmt)
drivers/gpu/drm/i915/gt/intel_gtt.h:#define DBG(...) trace_printk(__VA_ARGS__)
drivers/gpu/drm/i915/i915_gem.h:#define GEM_TRACE(...) trace_printk(__VA_ARGS__)
drivers/gpu/drm/i915/i915_gem.h:        trace_printk(__VA_ARGS__);                                      \
drivers/hwtracing/stm/dummy_stm.c:      trace_printk("[%u:%u] [pkt: %x/%x] (%llx)\n", master, channel,
drivers/infiniband/hw/hfi1/trace_dbg.h: trace_printk(fmt, ##__VA_ARGS__)
drivers/tty/n_tty.c:# define n_tty_trace(f, args...)    trace_printk(f, ##args)
drivers/usb/early/xhci-dbc.c:#define    xdbc_trace      trace_printk
fs/ext4/inline.c:       trace_printk("inode %lu\n", dir->i_ino);
fs/ext4/inline.c:               trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",


All except i915 use CPP tokens that don't exist, local developer really
has to take effort to enable it. i915 crud depends on a CONFIG_ symbols
that all{yes,mod}config will happily set for you,