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Howlett" To: Martin Kaiser Cc: Andrew Morton , maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] maple_tree: fix tracepoint string pointers Message-ID: Mail-Followup-To: "Liam R. 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List-Unsubscribe: * Martin Kaiser [251031 06:23]: > Thus wrote Andrew Morton (akpm@linux-foundation.org): > > > > - trace_ma_op(__func__, mas); > > > + trace_ma_op(TP_FCT, mas); > > > > What could cause the storage for __func__ to disappear as you suggest? > > I see your point. For __func__, the compiler generates a local symbol in > .rodata that should always be accessible by its address. > > One case that doesn't work without my patch would be trace-cmd record to save > the binary ringbuffer and trace-cmd report to parse it in userspace. The > address of __func__ can't be dereferenced from userspace but tracepoint_string > will add an entry to /sys/kernel/tracing/printk_formats > Thanks. Is there some way to detect such things at compile? Acked-by: Liam R. Howlett