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From: Arnd Bergmann <arnd@arndb.de>
To: y2038@lists.linaro.org, linux-kernel@vger.kernel.org
Cc: linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
	libc-alpha@sourceware.org, tglx@linutronix.de,
	deepa.kernel@gmail.com, viro@zeniv.linux.org.uk,
	ebiederm@xmission.com, albert.aribaud@3adev.fr,
	linux-s390@vger.kernel.org, schwidefsky@de.ibm.com,
	x86@kernel.org, catalin.marinas@arm.com, will.deacon@arm.com,
	linux-mips@linux-mips.org, jhogan@kernel.org,
	ralf@linux-mips.org, linuxppc-dev@lists.ozlabs.org,
	sparclinux@vger.kernel.org, zackw@panix.com, noloader@gmail.com,
	Arnd Bergmann <arnd@arndb.de>
Subject: [PATCH v4 11/16] y2038: xtensa: Extend sysvipc data structures
Date: Wed, 25 Apr 2018 17:06:01 +0200	[thread overview]
Message-ID: <20180425150606.954771-11-arnd@arndb.de> (raw)
In-Reply-To: <20180425132242.1500539-1-arnd@arndb.de>

xtensa, uses a nonstandard variation of the generic sysvipc
data structures, intended to have the padding moved around
so it can deal with big-endian 32-bit user space that has
64-bit time_t.

xtensa tries hard to define the structures so they work
in both big-endian and little-endian systems with padding
on the right side.
However, they only succeeded for for two of the three structures,
and their struct shmid64_ds ended up being defined in two
identical copies, and the big-endian one is wrong.

This takes just take the same approach here that we have for
the asm-generic headers and adds separate 32-bit fields for the
upper halves of the timestamps, to let libc deal with the mess
in user space.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/xtensa/include/uapi/asm/msgbuf.h | 25 ++++++++++++-----------
 arch/xtensa/include/uapi/asm/sembuf.h | 17 ++++++++--------
 arch/xtensa/include/uapi/asm/shmbuf.h | 37 ++++++++---------------------------
 3 files changed, 28 insertions(+), 51 deletions(-)

diff --git a/arch/xtensa/include/uapi/asm/msgbuf.h b/arch/xtensa/include/uapi/asm/msgbuf.h
index 36e2e103ca38..d6915e9f071c 100644
--- a/arch/xtensa/include/uapi/asm/msgbuf.h
+++ b/arch/xtensa/include/uapi/asm/msgbuf.h
@@ -7,7 +7,6 @@
  * between kernel and user space.
  *
  * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem
  * - 2 miscellaneous 32-bit values
  *
  * This file is subject to the terms and conditions of the GNU General
@@ -21,19 +20,19 @@
 struct msqid64_ds {
 	struct ipc64_perm msg_perm;
 #ifdef __XTENSA_EB__
-	unsigned int	__unused1;
-	__kernel_time_t msg_stime;	/* last msgsnd time */
-	unsigned int	__unused2;
-	__kernel_time_t msg_rtime;	/* last msgrcv time */
-	unsigned int	__unused3;
-	__kernel_time_t msg_ctime;	/* last change time */
+	unsigned long  msg_stime_high;
+	unsigned long  msg_stime;	/* last msgsnd time */
+	unsigned long  msg_rtime_high;
+	unsigned long  msg_rtime;	/* last msgrcv time */
+	unsigned long  msg_ctime_high;
+	unsigned long  msg_ctime;	/* last change time */
 #elif defined(__XTENSA_EL__)
-	__kernel_time_t msg_stime;	/* last msgsnd time */
-	unsigned int	__unused1;
-	__kernel_time_t msg_rtime;	/* last msgrcv time */
-	unsigned int	__unused2;
-	__kernel_time_t msg_ctime;	/* last change time */
-	unsigned int	__unused3;
+	unsigned long  msg_stime;	/* last msgsnd time */
+	unsigned long  msg_stime_high;
+	unsigned long  msg_rtime;	/* last msgrcv time */
+	unsigned long  msg_rtime_high;
+	unsigned long  msg_ctime;	/* last change time */
+	unsigned long  msg_ctime_high;
 #else
 # error processor byte order undefined!
 #endif
diff --git a/arch/xtensa/include/uapi/asm/sembuf.h b/arch/xtensa/include/uapi/asm/sembuf.h
index f61b6331a10c..09f348d643f1 100644
--- a/arch/xtensa/include/uapi/asm/sembuf.h
+++ b/arch/xtensa/include/uapi/asm/sembuf.h
@@ -14,7 +14,6 @@
  * between kernel and user space.
  *
  * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem
  * - 2 miscellaneous 32-bit values
  *
  */
@@ -27,15 +26,15 @@
 struct semid64_ds {
 	struct ipc64_perm sem_perm;		/* permissions .. see ipc.h */
 #ifdef __XTENSA_EL__
-	__kernel_time_t	sem_otime;		/* last semop time */
-	unsigned long	__unused1;
-	__kernel_time_t	sem_ctime;		/* last change time */
-	unsigned long	__unused2;
+	unsigned long	sem_otime;		/* last semop time */
+	unsigned long	sem_otime_high;
+	unsigned long	sem_ctime;		/* last change time */
+	unsigned long	sem_ctime_high;
 #else
-	unsigned long	__unused1;
-	__kernel_time_t	sem_otime;		/* last semop time */
-	unsigned long	__unused2;
-	__kernel_time_t	sem_ctime;		/* last change time */
+	unsigned long	sem_otime_high;
+	unsigned long	sem_otime;		/* last semop time */
+	unsigned long	sem_ctime_high;
+	unsigned long	sem_ctime;		/* last change time */
 #endif
 	unsigned long	sem_nsems;		/* no. of semaphores in array */
 	unsigned long	__unused3;
diff --git a/arch/xtensa/include/uapi/asm/shmbuf.h b/arch/xtensa/include/uapi/asm/shmbuf.h
index 26550bdc8430..554a57a6a90f 100644
--- a/arch/xtensa/include/uapi/asm/shmbuf.h
+++ b/arch/xtensa/include/uapi/asm/shmbuf.h
@@ -4,10 +4,10 @@
  *
  * The shmid64_ds structure for Xtensa architecture.
  * Note extra padding because this structure is passed back and forth
- * between kernel and user space.
+ * between kernel and user space, but the padding is on the wrong
+ * side for big-endian xtensa, for historic reasons.
  *
  * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem
  * - 2 miscellaneous 32-bit values
  *
  * This file is subject to the terms and conditions of the GNU General Public
@@ -20,42 +20,21 @@
 #ifndef _XTENSA_SHMBUF_H
 #define _XTENSA_SHMBUF_H
 
-#if defined (__XTENSA_EL__)
 struct shmid64_ds {
 	struct ipc64_perm	shm_perm;	/* operation perms */
 	size_t			shm_segsz;	/* size of segment (bytes) */
-	__kernel_time_t		shm_atime;	/* last attach time */
-	unsigned long		__unused1;
-	__kernel_time_t		shm_dtime;	/* last detach time */
-	unsigned long		__unused2;
-	__kernel_time_t		shm_ctime;	/* last change time */
-	unsigned long		__unused3;
+	unsigned long		shm_atime;	/* last attach time */
+	unsigned long		shm_atime_high;
+	unsigned long		shm_dtime;	/* last detach time */
+	unsigned long		shm_dtime_high;
+	unsigned long		shm_ctime;	/* last change time */
+	unsigned long		shm_ctime_high;
 	__kernel_pid_t		shm_cpid;	/* pid of creator */
 	__kernel_pid_t		shm_lpid;	/* pid of last operator */
 	unsigned long		shm_nattch;	/* no. of current attaches */
 	unsigned long		__unused4;
 	unsigned long		__unused5;
 };
-#elif defined (__XTENSA_EB__)
-struct shmid64_ds {
-	struct ipc64_perm	shm_perm;	/* operation perms */
-	size_t			shm_segsz;	/* size of segment (bytes) */
-	__kernel_time_t		shm_atime;	/* last attach time */
-	unsigned long		__unused1;
-	__kernel_time_t		shm_dtime;	/* last detach time */
-	unsigned long		__unused2;
-	__kernel_time_t		shm_ctime;	/* last change time */
-	unsigned long		__unused3;
-	__kernel_pid_t		shm_cpid;	/* pid of creator */
-	__kernel_pid_t		shm_lpid;	/* pid of last operator */
-	unsigned long		shm_nattch;	/* no. of current attaches */
-	unsigned long		__unused4;
-	unsigned long		__unused5;
-};
-#else
-# error endian order not defined
-#endif
-
 
 struct shminfo64 {
 	unsigned long	shmmax;
-- 
2.9.0

  parent reply	other threads:[~2018-04-25 15:06 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-25 13:22 [GIT PULL, PATCH v4 00/16] y2038: IPC system call conversion Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 01/16] y2038: asm-generic: Extend sysvipc data structures Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 02/16] y2038: x86: " Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 03/16] y2038: alpha: Remove unneeded ipc uapi header files Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 04/16] y2038: ia64: " Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 05/16] y2038: s390: " Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 06/16] y2038: arm64: Extend sysvipc compat data structures Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 07/16] y2038: mips: Extend sysvipc " Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 08/16] y2038: parisc: " Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 09/16] y2038: sparc: " Arnd Bergmann
2018-04-25 15:06 ` [PATCH v4 10/16] y2038: powerpc: " Arnd Bergmann
2018-04-25 15:06 ` Arnd Bergmann [this message]
2018-04-25 15:06 ` [PATCH v4 12/16] y2038: ipc: Use ktime_get_real_seconds consistently Arnd Bergmann
2018-04-25 15:06 ` [PATCH v4 13/16] y2038: ipc: Report long times to user space Arnd Bergmann
2018-04-25 15:06 ` [PATCH v4 14/16] y2038: ipc: Use __kernel_timespec Arnd Bergmann
2018-04-25 15:06 ` [PATCH v4 15/16] y2038: ipc: Enable COMPAT_32BIT_TIME Arnd Bergmann
2018-04-25 15:06 ` [PATCH v4 16/16] y2038: ipc: Redirect ipc(SEMTIMEDOP, ...) to compat_ksys_semtimedop Arnd Bergmann

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