linux-kernel - Re: [PATCH 10/16] compile error: MIPS: add definitions for extended context

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Date:	Sun, 25 Oct 2015 22:10:02 +0100
From:	Hauke Mehrtens <hauke@...ke-m.de>
To:	Paul Burton <paul.burton@...tec.com>, linux-mips@...ux-mips.org,
	Ralf Baechle <ralf@...ux-mips.org>
CC:	Matthew Fortune <matthew.fortune@...tec.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>,
	Alex Smith <alex@...x-smith.me.uk>,
	linux-kernel@...r.kernel.org,
	Michal Nazarewicz <mina86@...a86.com>,
	Richard Weinberger <richard@....at>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	Markos Chandras <markos.chandras@...tec.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	"Maciej W. Rozycki" <macro@...esourcery.com>
Subject: Re: [PATCH 10/16] compile error: MIPS: add definitions for extended
 context

This patch is causing a build error for me on 4.3-rc7.

  CC      arch/mips/kernel/signal.o
arch/mips/kernel/signal.c: In function 'sc_to_extcontext':
arch/mips/kernel/signal.c:143:12: error: 'struct ucontext' has no member
named 'uc_extcontext'
  return &uc->uc_extcontext;
            ^
In file included from include/linux/poll.h:11:0,
                 from include/linux/ring_buffer.h:7,
                 from include/linux/trace_events.h:5,
                 from include/trace/syscall.h:6,
                 from include/linux/syscalls.h:81,
                 from arch/mips/kernel/signal.c:26:
arch/mips/kernel/signal.c: In function 'save_msa_extcontext':
arch/mips/kernel/signal.c:171:40: error: dereferencing pointer to
incomplete type 'struct msa_extcontext'
   err = __put_user(read_msa_csr(), &msa->csr);
                                        ^
./arch/mips/include/asm/uaccess.h:441:15: note: in definition of macro
'__put_user_nocheck'
  __typeof__(*(ptr)) __pu_val;     \
               ^
arch/mips/kernel/signal.c:171:9: note: in expansion of macro '__put_user'
   err = __put_user(read_msa_csr(), &msa->csr);
         ^
arch/mips/kernel/signal.c:186:20: error: 'MSA_EXTCONTEXT_MAGIC'
undeclared (first use in this function)
  err |= __put_user(MSA_EXTCONTEXT_MAGIC, &msa->ext.magic);
                    ^
./arch/mips/include/asm/uaccess.h:444:14: note: in definition of macro
'__put_user_nocheck'
  __pu_val = (x);       \
              ^
arch/mips/kernel/signal.c:186:9: note: in expansion of macro '__put_user'
  err |= __put_user(MSA_EXTCONTEXT_MAGIC, &msa->ext.magic);
         ^
arch/mips/kernel/signal.c:186:20: note: each undeclared identifier is
reported only once for each function it appears in
  err |= __put_user(MSA_EXTCONTEXT_MAGIC, &msa->ext.magic);
                    ^
./arch/mips/include/asm/uaccess.h:444:14: note: in definition of macro
'__put_user_nocheck'
  __pu_val = (x);       \
              ^
arch/mips/kernel/signal.c:186:9: note: in expansion of macro '__put_user'
  err |= __put_user(MSA_EXTCONTEXT_MAGIC, &msa->ext.magic);
         ^
.......


When I include uapi/asm/ucontext.h instead of asm/ucontext.h in signal.c
it compiles again.

Hauke
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