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time/posix-timers: Move the compat copyouts to the nanosleep implementations

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Turn restart_block.nanosleep.{rmtp,compat_rmtp} into a tagged union (kind =
1 -> native, kind = 2 -> compat, kind = 0 -> nothing) and make the places
doing actual copyout handle compat as well as native (that will become a
helper in the next commit).  Result: compat wrappers, messing with
reassignments, etc. are gone.

[ tglx: Folded in a variant of Peter Zijlstras enum patch ]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170607084241.28657-6-viro@ZenIV.linux.org.uk
This commit is contained in:
Al Viro 2017-06-07 09:42:31 +01:00 • committed by Thomas Gleixner
parent 99e6c0e6ec
commit edbeda4632
8 changed files with 142 additions and 171 deletions
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15
include/linux/restart_block.h
View file

@ -11,6 +11,14 @@ struct timespec;
struct compat_timespec;
struct pollfd;
enum timespec_type {
TT_NONE = 0,
TT_NATIVE = 1,
#ifdef CONFIG_COMPAT
TT_COMPAT = 2,
#endif
};
/*
* System call restart block.
*/
@ -29,10 +37,13 @@ struct restart_block {
/* For nanosleep */
struct {
clockid_t clockid;
struct timespec __user *rmtp;
enum timespec_type type;
union {
struct timespec __user *rmtp;
#ifdef CONFIG_COMPAT
struct compat_timespec __user *compat_rmtp;
struct compat_timespec __user *compat_rmtp;
#endif
};
u64 expires;
} nanosleep;
/* For poll */