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compat: Get rid of (get|put)_compat_time(val|spec)

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We have two APIs for compatiblity timespec/val, with confusingly
similar names.  compat_(get|put)_time(val|spec) *do* handle the case
where COMPAT_USE_64BIT_TIME is set, whereas
(get|put)_compat_time(val|spec) do not.  This is an accident waiting
to happen.

Clean it up by favoring the full-service version; the limited version
is replaced with double-underscore versions static to kernel/compat.c.

A common pattern is to convert a struct timespec to kernel format in
an allocation on the user stack.  Unfortunately it is open-coded in
several places.  Since this allocation isn't actually needed if
COMPAT_USE_64BIT_TIME is true (since user format == kernel format)
encapsulate that whole pattern into the function
compat_convert_timespec().  An equivalent function should be written
for struct timeval if it is needed in the future.

Finally, get rid of compat_(get|put)_timeval_convert(): each was only
used once, and the latter was not even doing what the function said
(no conversion actually was being done.)  Moving the conversion into
compat_sys_settimeofday() itself makes the code much more similar to
sys_settimeofday() itself.

v3: Remove unused compat_convert_timeval().

v2: Drop bogus "const" in the destination argument for
    compat_convert_time*().

Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Hans Verkuil <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Manfred Spraul <[email protected]>
Cc: Mateusz Guzik <[email protected]>
Cc: Rafael Aquini <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Tested-by: H.J. Lu <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
H. Peter Anvin 2014-02-01 18:54:11 -08:00
commit 81993e81a9
7 changed files with 75 additions and 97 deletions
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6
fs/compat.c
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@ -92,8 +92,8 @@ asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filena
struct timespec tv[2];
if (t) {
if (get_compat_timespec(&tv[0], &t[0]) ||
get_compat_timespec(&tv[1], &t[1]))
if (compat_get_timespec(&tv[0], &t[0]) ||
compat_get_timespec(&tv[1], &t[1]))
return -EFAULT;
if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
@ -512,7 +512,7 @@ compat_sys_io_getevents(aio_context_t ctx_id,
nr * sizeof(struct io_event))))
goto out;
if (timeout) {
if (get_compat_timespec(&t, timeout))
if (compat_get_timespec(&t, timeout))
goto out;
ut = compat_alloc_user_space(sizeof(*ut));