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y2038: sparc: Extend sysvipc data structures

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sparc, 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.

Unlike most architectures, sparc actually succeeded in
defining this right for big-endian CPUs, but as everyone else
got it wrong, we just use the same hack everywhere.

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>
This commit is contained in:
Arnd Bergmann
2015-05-05 23:19:43 +02:00
parent f69c97f6a4
commit 91b9b0d718
4 changed files with 41 additions and 50 deletions
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22
arch/sparc/include/uapi/asm/msgbuf.h
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@@ -8,25 +8,22 @@
* between kernel and user space.
*
* Pad space is left for:
* - 64-bit time_t to solve y2038 problem
* - 2 miscellaneous 32-bit values
*/
#if defined(__sparc__) && defined(__arch64__)
# define PADDING(x)
#else
# define PADDING(x) unsigned int x;
#endif
struct msqid64_ds {
struct ipc64_perm msg_perm;
PADDING(__pad1)
#if defined(__sparc__) && defined(__arch64__)
__kernel_time_t msg_stime; /* last msgsnd time */
PADDING(__pad2)
__kernel_time_t msg_rtime; /* last msgrcv time */
PADDING(__pad3)
__kernel_time_t msg_ctime; /* last change time */
#else
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 */
#endif
unsigned long msg_cbytes; /* current number of bytes on queue */
unsigned long msg_qnum; /* number of messages in queue */
unsigned long msg_qbytes; /* max number of bytes on queue */
@@ -35,5 +32,4 @@ struct msqid64_ds {
unsigned long __unused1;
unsigned long __unused2;
};
#undef PADDING
#endif /* _SPARC_MSGBUF_H */