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ARM: 9114/1: oabi-compat: rework sys_semtimedop emulation

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sys_oabi_semtimedop() is one of the last users of set_fs() on Arm. To
remove this one, expose the internal code of the actual implementation
that operates on a kernel pointer and call it directly after copying.

There should be no measurable impact on the normal execution of this
function, and it makes the overly long function a little shorter, which
may help readability.

While reworking the oabi version, make it behave a little more like
the native one, using kvmalloc_array() and restructure the code
flow in a similar way.

The naming of __do_semtimedop() is not very good, I hope someone can
come up with a better name.

One regression was spotted by kernel test robot <rong.a.chen@intel.com>
and fixed before the first mailing list submission.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Arnd Bergmann 2021-08-11 08:30:23 +01:00 • committed by Russell King (Oracle)
parent 249dbe74d3
commit bdec014528
3 changed files with 99 additions and 48 deletions
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3
include/linux/syscalls.h
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@ -1373,6 +1373,9 @@ long ksys_old_shmctl(int shmid, int cmd, struct shmid_ds __user *buf);
long compat_ksys_semtimedop(int semid, struct sembuf __user *tsems,
unsigned int nsops,
const struct old_timespec32 __user *timeout);
long __do_semtimedop(int semid, struct sembuf *tsems, unsigned int nsops,
const struct timespec64 *timeout,
struct ipc_namespace *ns);
int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
int __user *optlen);