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tile: vdso: use raw_read_seqcount_begin() in vdso 

Previously we were using read_seqcount_begin(), which works fine until
lockdep is enabled in the kernel, at which point lockdep locking shows
up in the vdso and userspace will take a GPV accessing a kernel-only
SPR when calling gettimeofday() etc.

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
This commit is contained in:
Chris Metcalf 2015-06-04 13:28:16 -04:00
parent 41dd496c8d
commit 9ae4d6bf22
1 changed files with 5 additions and 5 deletions
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10
arch/tile/kernel/vdso/vgettimeofday.c
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@ -67,7 +67,7 @@ static inline int do_realtime(struct vdso_data *vdso, struct timespec *ts)
u64 ns;
do {
count = read_seqcount_begin(&vdso->tb_seq);
count = raw_read_seqcount_begin(&vdso->tb_seq);
ts->tv_sec = vdso->wall_time_sec;
ns = vdso->wall_time_snsec;
ns += vgetsns(vdso);
@ -86,7 +86,7 @@ static inline int do_monotonic(struct vdso_data *vdso, struct timespec *ts)
u64 ns;
do {
count = read_seqcount_begin(&vdso->tb_seq);
count = raw_read_seqcount_begin(&vdso->tb_seq);
ts->tv_sec = vdso->monotonic_time_sec;
ns = vdso->monotonic_time_snsec;
ns += vgetsns(vdso);
@ -105,7 +105,7 @@ static inline int do_realtime_coarse(struct vdso_data *vdso,
unsigned count;
do {
count = read_seqcount_begin(&vdso->tb_seq);
count = raw_read_seqcount_begin(&vdso->tb_seq);
ts->tv_sec = vdso->wall_time_coarse_sec;
ts->tv_nsec = vdso->wall_time_coarse_nsec;
} while (unlikely(read_seqcount_retry(&vdso->tb_seq, count)));
@ -119,7 +119,7 @@ static inline int do_monotonic_coarse(struct vdso_data *vdso,
unsigned count;
do {
count = read_seqcount_begin(&vdso->tb_seq);
count = raw_read_seqcount_begin(&vdso->tb_seq);
ts->tv_sec = vdso->monotonic_time_coarse_sec;
ts->tv_nsec = vdso->monotonic_time_coarse_nsec;
} while (unlikely(read_seqcount_retry(&vdso->tb_seq, count)));
@ -137,7 +137,7 @@ struct syscall_return_value __vdso_gettimeofday(struct timeval *tv,
/* The use of the timezone is obsolete, normally tz is NULL. */
if (unlikely(tz != NULL)) {
do {
count = read_seqcount_begin(&vdso->tz_seq);
count = raw_read_seqcount_begin(&vdso->tz_seq);
tz->tz_minuteswest = vdso->tz_minuteswest;
tz->tz_dsttime = vdso->tz_dsttime;
} while (unlikely(read_seqcount_retry(&vdso->tz_seq, count)));