linux-kernel - Re: [REGRESSION] uml: signal.c build errors

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Date:	Wed, 24 Oct 2012 10:08:35 +0200
From:	Richard Weinberger <richard@....at>
To:	Matthew Leach <matthew@...tleach.net>
CC:	linux-kernel@...r.kernel.org,
	Martin Pärtel <martin.partel@...il.com>
Subject: Re: [REGRESSION] uml: signal.c build errors

On 24.10.2012 01:18, Matthew Leach wrote:
> Hi,
>
> When building UML against 3.7-rc2 I encounter the following build error:
>
> # make ARCH=uml
> scripts/kconfig/conf --silentoldconfig arch/x86/um/Kconfig
>    CHK     include/generated/uapi/linux/version.h
>    UPD     include/generated/uapi/linux/version.h
>    WRAP    arch/um/include/generated/asm/clkdev.h
>    SYSHDR  arch/x86/syscalls/../include/generated/uapi/asm/unistd_32.h
>    SYSHDR  arch/x86/syscalls/../include/generated/uapi/asm/unistd_64.h
>    SYSHDR  arch/x86/syscalls/../include/generated/uapi/asm/unistd_x32.h
>
> ...
>
>    CC      arch/um/os-Linux/signal.o
> arch/um/os-Linux/signal.c:18:8: error: conflicting types for ‘sig_info’
> In file included from arch/um/os-Linux/signal.c:12:0:
> /home/matthew/Development/linux/arch/um/include/shared/as-layout.h:64:15: note: previous declaration of ‘sig_info’ was here
> arch/um/os-Linux/signal.c:19:2: warning: initialization from incompatible pointer type [enabled by default]
> arch/um/os-Linux/signal.c:19:2: warning: (near initialization for ‘sig_info[5]’) [enabled by default]
> arch/um/os-Linux/signal.c:20:2: warning: initialization from incompatible pointer type [enabled by default]
> arch/um/os-Linux/signal.c:20:2: warning: (near initialization for ‘sig_info[8]’) [enabled by default]
> arch/um/os-Linux/signal.c:21:2: warning: initialization from incompatible pointer type [enabled by default]
> arch/um/os-Linux/signal.c:21:2: warning: (near initialization for ‘sig_info[4]’) [enabled by default]
> arch/um/os-Linux/signal.c:22:2: warning: initialization from incompatible pointer type [enabled by default]
> arch/um/os-Linux/signal.c:22:2: warning: (near initialization for ‘sig_info[28]’) [enabled by default]
> arch/um/os-Linux/signal.c:23:2: warning: initialization from incompatible pointer type [enabled by default]
> arch/um/os-Linux/signal.c:23:2: warning: (near initialization for ‘sig_info[7]’) [enabled by default]
> arch/um/os-Linux/signal.c:24:2: warning: initialization from incompatible pointer type [enabled by default]
> arch/um/os-Linux/signal.c:24:2: warning: (near initialization for ‘sig_info[11]’) [enabled by default]
> arch/um/os-Linux/signal.c:25:2: warning: initialization from incompatible pointer type [enabled by default]
> arch/um/os-Linux/signal.c:25:2: warning: (near initialization for ‘sig_info[29]’) [enabled by default]
> arch/um/os-Linux/signal.c:26:2: warning: initialization from incompatible pointer type [enabled by default]
> arch/um/os-Linux/signal.c:26:2: warning: (near initialization for ‘sig_info[26]’) [enabled by default]
> arch/um/os-Linux/signal.c:133:1: warning: initialization from incompatible pointer type [enabled by default]
> arch/um/os-Linux/signal.c:133:1: warning: (near initialization for ‘handlers[26]’) [enabled by default]
> make[1]: *** [arch/um/os-Linux/signal.o] Error 1
> make: *** [arch/um/os-Linux] Error 2
>
> I have tracked this down to [1] where, indeed, the type of sig_info is
> different; the second parameter in signal.c is 'siginfo_t' where as in
> as-layout.h the second parameter's type is declared as 'struct siginfo'.
>
> [1]: d3c1cfcdb43e023ab1b1c7a555cd9e929026500a

Does this patch fix the issue?
Are you using glibc 2.17?

Thanks,
//richard

---
diff --git a/arch/um/include/shared/as-layout.h b/arch/um/include/shared/as-layout.h
index 694c792..48fcbb0 100644
--- a/arch/um/include/shared/as-layout.h
+++ b/arch/um/include/shared/as-layout.h
@@ -60,9 +60,6 @@ extern unsigned long host_task_size;

  extern int linux_main(int argc, char **argv);

-struct siginfo;
-extern void (*sig_info[])(int, struct siginfo *si, struct uml_pt_regs *);
-
  #endif

  #endif
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 4625949..3a72936 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -23,6 +23,9 @@
  #include <skas_ptrace.h>
  #include <sysdep/stub.h>

+#include <signal.h>
+extern void (*sig_info[NSIG])(int, siginfo_t *, struct uml_pt_regs *);
+
  int is_skas_winch(int pid, int fd, void *data)
  {
  	return pid == getpgrp();

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