linux-kernel - Re: [PATCH 4/7] mm/vmalloc: Use a trace_alloc_vmap

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Date:   Tue, 18 Oct 2022 18:17:55 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 4/7] mm/vmalloc: Use a trace_alloc_vmap_area event

Hello, Steven.

> 
> [auto build test ERROR on akpm-mm/mm-everything]
> [also build test ERROR on linus/master v6.1-rc1 next-20221017]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Uladzislau-Rezki-Sony/Add-basic-trace-events-for-vmap-vmalloc/20221018-000544
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> patch link:    https://lore.kernel.org/r/20221017160233.16582-7-urezki%40gmail.com
> patch subject: [PATCH 4/7] mm/vmalloc: Use a trace_alloc_vmap_area event
> config: um-i386_defconfig
> compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
> reproduce (this is a W=1 build):
>         # https://github.com/intel-lab-lkp/linux/commit/fbc853c689b29d3bb9fe250b2653fd2dd8046fc7
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Uladzislau-Rezki-Sony/Add-basic-trace-events-for-vmap-vmalloc/20221018-000544
>         git checkout fbc853c689b29d3bb9fe250b2653fd2dd8046fc7
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from include/trace/events/vmap.h:123,
>                     from mm/vmalloc.c:47:
> >> include/trace/define_trace.h:84:34: fatal error: trace/events/kernel_vmap.h: No such file or directory
>       84 | # define __TRACE_INCLUDE(system) <trace/events/system.h>
>          |                                  ^
>    compilation terminated.
>
I can reproduce it. It seems it happens so far only on the ARCH=um case.
For regular arm/x86 i do not see such build error.

If i rename the TRACE_SYSTEM macro to something different then "vmap"
it compiles fine. In case of:

#define TRACE_SYSTEM vmap

the prefix "kernel_" is added, thus the header name becomes as kernel_vmap.h

Steven can you give some indications? Or any thoughts about it?

Thank you in advance!

--
Uladzislau Rezki