linux-kernel - Re: linux-next: build warning after merge of the ftrace tree

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Date: Wed, 15 May 2024 00:49:31 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Vincent Donnefort
 <vdonnefort@...gle.com>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the ftrace tree

On Wed, 15 May 2024 12:48:08 +1000
Stephen Rothwell <sfr@...b.auug.org.au> wrote:

> Hi all,
> 
> After merging the ftrace tree, today's linux-next build (powerpc
> ppc64_defconfig) produced this warning:

Interesting, as I didn't get reports from it via zero-day bot.

> 
> In file included from arch/powerpc/include/asm/page.h:332,
>                  from arch/powerpc/include/asm/mmu.h:144,
>                  from arch/powerpc/include/asm/paca.h:18,
>                  from arch/powerpc/include/asm/current.h:13,
>                  from include/linux/thread_info.h:23,
>                  from include/asm-generic/preempt.h:5,
>                  from ./arch/powerpc/include/generated/asm/preempt.h:1,
>                  from include/linux/preempt.h:79,
>                  from include/linux/alloc_tag.h:11,
>                  from include/linux/percpu.h:5,
>                  from include/linux/context_tracking_state.h:5,
>                  from include/linux/hardirq.h:5,
>                  from include/linux/interrupt.h:11,
>                  from include/linux/trace_recursion.h:5,
>                  from kernel/trace/ring_buffer.c:7:
> kernel/trace/ring_buffer.c: In function '__rb_map_vma':
> kernel/trace/ring_buffer.c:6286:72: warning: passing argument 1 of 'virt_to_pfn' makes pointer from integer without a cast [-Wint-conversion]
>  6286 |                 struct page *page = virt_to_page(cpu_buffer->subbuf_ids[s]);
>       |                                                  ~~~~~~~~~~~~~~~~~~~~~~^~~
>       |                                                                        |
>       |                                                                        long unsigned int
> include/asm-generic/memory_model.h:37:45: note: in definition of macro '__pfn_to_page'
>    37 | #define __pfn_to_page(pfn)      (vmemmap + (pfn))
>       |                                             ^~~
> kernel/trace/ring_buffer.c:6286:37: note: in expansion of macro 'virt_to_page'
>  6286 |                 struct page *page = virt_to_page(cpu_buffer->subbuf_ids[s]);
>       |                                     ^~~~~~~~~~~~
> arch/powerpc/include/asm/page.h:228:53: note: expected 'const void *' but argument is of type 'long unsigned int'
>   228 | static inline unsigned long virt_to_pfn(const void *kaddr)
>       |                                         ~~~~~~~~~~~~^~~~~
> 
> Introduced by commit
> 
>   117c39200d9d ("ring-buffer: Introducing ring-buffer mapping functions")
> 
> My arm multi_v7_defconfig build produced a similar warning.
> 
> Is this really intended for v6.10?  It seems a bit late.
> 

Well, I submitted this for the v6.9 merge window, and Linus had issues
with it. So we've been tweaking it for the entire time and it was ready
a bit earlier, but due to my vacation and traveling I missed pushing it
to next. :-p

Most the code has been well tested, but because it is late, I kept it
as a separate topic branch in case Linus still isn't happy with it.

-- Steve