linux-kernel - Re: [PATCH] tool/perf: fix perf compiling errors

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Date:   Thu, 21 Sep 2017 12:01:38 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Li Zhijian <lizhijian@...fujitsu.com>
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, linux-kernel@...r.kernel.org,
        philip.li@...el.com
Subject: Re: [PATCH] tool/perf: fix perf compiling errors

Em Thu, Sep 21, 2017 at 02:01:13PM +0800, Li Zhijian escreveu:
> since f045b8c, we failed to build perf with LIBCLANGLLVM=1, this patch is to
> fix the following compiling errors
> --------------
> lizhijian@...well-OptiPlex-9020:~/lkp/linux/tools/perf$ make LLVM_CONFIG=/usr/bin/llvm-config-3.9 LIBCLANGLLVM=1
>   CXX      util/c++/clang-test.o
> In file included from /home/lizj/linux/tools/include/linux/list.h:5:0,
>                  from /home/lizj/linux/tools/perf/util/namespaces.h:13,
>                  from /home/lizj/linux/tools/perf/util/util.h:15,
>                  from /home/lizj/linux/tools/perf/util/util-cxx.h:20,
>                  from util/c++/clang-c.h:5,
>                  from util/c++/clang-test.cpp:2:
> /home/lizj/linux/tools/include/linux/list.h: In function ‘void list_del(list_head*)’:
> /home/lizj/linux/tools/include/linux/poison.h:14:31: error: pointer of type ‘void *’ used in arithmetic [-Werror=pointer-arith]
>  # define POISON_POINTER_DELTA 0
>                                ^
> /home/lizj/linux/tools/include/linux/poison.h:22:41: note: in expansion of macro ‘POISON_POINTER_DELTA’
>  #define LIST_POISON1  ((void *) 0x100 + POISON_POINTER_DELTA)
>                                          ^
> /home/lizj/linux/tools/include/linux/list.h:107:16: note: in expansion of macro ‘LIST_POISON1’
>   entry->next = LIST_POISON1;
>                 ^
> In file included from /home/lizj/linux/tools/perf/util/namespaces.h:13:0,
>                  from /home/lizj/linux/tools/perf/util/util.h:15,
>                  from /home/lizj/linux/tools/perf/util/util-cxx.h:20,
>                  from util/c++/clang-c.h:5,
>                  from util/c++/clang-test.cpp:2:
> /home/lizj/linux/tools/include/linux/list.h:107:14: error: invalid conversion from ‘void*’ to ‘list_head*’ [-fpermissive]


> +++ b/tools/perf/util/namespaces.h
> @@ -10,7 +10,6 @@
>  #define __PERF_NAMESPACES_H
>  
>  #include "../perf.h"
> -#include <linux/list.h>
>  #include <linux/refcount.h>

Well, you can't do that, as namespaces.h needs list.h, a bit after te
above hunk:

  9 #ifndef __PERF_NAMESPACES_H 
 10 #define __PERF_NAMESPACES_H 
 11  
 12 #include "../perf.h" 
 13 #include <linux/list.h> 
 14 #include <linux/refcount.h> 
 15  
 16 struct namespaces_event; 
 17  
 18 struct namespaces { 
 19         struct list_head list; 
 20         u64 end_time; 
 21         struct perf_ns_link_info link_info[]; 
 22 }; 


Can you try with the following patch instead?


diff --git a/tools/include/linux/poison.h b/tools/include/linux/poison.h
index 51334edec506..f306a7642509 100644
--- a/tools/include/linux/poison.h
+++ b/tools/include/linux/poison.h
@@ -14,6 +14,10 @@
 # define POISON_POINTER_DELTA 0
 #endif
 
+#ifdef __cplusplus
+#define LIST_POISON1  NULL
+#define LIST_POISON2  NULL
+#else
 /*
  * These are non-NULL pointers that will result in page faults
  * under normal circumstances, used to verify that nobody uses
@@ -21,6 +25,7 @@
  */
 #define LIST_POISON1  ((void *) 0x100 + POISON_POINTER_DELTA)
 #define LIST_POISON2  ((void *) 0x200 + POISON_POINTER_DELTA)
+#endif
 
 /********** include/linux/timer.h **********/
 /*