linux-kernel - [added to the 4.1 stable tree] SIGNAL: Move generic copy

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Message-Id: <1464989831-16666-91-git-send-email-sasha.levin@oracle.com>
Date:	Fri,  3 Jun 2016 17:36:26 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	stable@...r.kernel.org, stable-commits@...r.kernel.org
Cc:	James Hogan <james.hogan@...tec.com>,
	Arnd Bergmann <arnd@...db.de>,
	Ralf Baechle <ralf@...ux-mips.org>, Petr Malat <oss@...at.biz>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Christopher Ferris <cferris@...gle.com>,
	linux-arch@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sasha Levin <sasha.levin@...cle.com>
Subject: [added to the 4.1 stable tree] SIGNAL: Move generic copy_siginfo() to signal.h

From: James Hogan <james.hogan@...tec.com>

This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.

===============

[ Upstream commit ca9eb49aa9562eaadf3cea071ec7018ad6800425 ]

The generic copy_siginfo() is currently defined in
asm-generic/siginfo.h, after including uapi/asm-generic/siginfo.h which
defines the generic struct siginfo. However this makes it awkward for an
architecture to use it if it has to define its own struct siginfo (e.g.
MIPS and potentially IA64), since it means that asm-generic/siginfo.h
can only be included after defining the arch-specific siginfo, which may
be problematic if the arch-specific definition needs definitions from
uapi/asm-generic/siginfo.h.

It is possible to work around this by first including
uapi/asm-generic/siginfo.h to get the constants before defining the
arch-specific siginfo, and include asm-generic/siginfo.h after. However
uapi headers can't be included by other uapi headers, so that first
include has to be in an ifdef __kernel__, with the non __kernel__ case
including the non-UAPI header instead.

Instead of that mess, move the generic copy_siginfo() definition into
linux/signal.h, which allows an arch-specific uapi/asm/siginfo.h to
include asm-generic/siginfo.h and define the arch-specific siginfo, and
for the generic copy_siginfo() to see that arch-specific definition.

Signed-off-by: James Hogan <james.hogan@...tec.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: Petr Malat <oss@...at.biz>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Christopher Ferris <cferris@...gle.com>
Cc: linux-arch@...r.kernel.org
Cc: linux-mips@...ux-mips.org
Cc: linux-ia64@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: <stable@...r.kernel.org> # 4.0-
Patchwork: https://patchwork.linux-mips.org/patch/12478/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
---
 include/asm-generic/siginfo.h | 15 ---------------
 include/linux/signal.h        | 15 +++++++++++++++
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/include/asm-generic/siginfo.h b/include/asm-generic/siginfo.h
index 3d1a3af..a2508a8 100644
--- a/include/asm-generic/siginfo.h
+++ b/include/asm-generic/siginfo.h
@@ -17,21 +17,6 @@
 struct siginfo;
 void do_schedule_next_timer(struct siginfo *info);
 
-#ifndef HAVE_ARCH_COPY_SIGINFO
-
-#include <linux/string.h>
-
-static inline void copy_siginfo(struct siginfo *to, struct siginfo *from)
-{
-	if (from->si_code < 0)
-		memcpy(to, from, sizeof(*to));
-	else
-		/* _sigchld is currently the largest know union member */
-		memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld));
-}
-
-#endif
-
 extern int copy_siginfo_to_user(struct siginfo __user *to, const struct siginfo *from);
 
 #endif
diff --git a/include/linux/signal.h b/include/linux/signal.h
index ab1e039..883ceb1 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -28,6 +28,21 @@ struct sigpending {
 	sigset_t signal;
 };
 
+#ifndef HAVE_ARCH_COPY_SIGINFO
+
+#include <linux/string.h>
+
+static inline void copy_siginfo(struct siginfo *to, struct siginfo *from)
+{
+	if (from->si_code < 0)
+		memcpy(to, from, sizeof(*to));
+	else
+		/* _sigchld is currently the largest know union member */
+		memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld));
+}
+
+#endif
+
 /*
  * Define some primitives to manipulate sigset_t.
  */
-- 
2.5.0