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>

diff --git a/arch/tile/kernel/vdso/vgettimeofday.c b/arch/tile/kernel/vdso/vgettimeofday.c
index 8bb21eda07d8d0e3eff6a9fac689725ff939d31a..e63310c49742ca3036f9ed50556ff382bc36722b 100644 (file)
--- a/arch/tile/kernel/vdso/vgettimeofday.c
+++ b/arch/tile/kernel/vdso/vgettimeofday.c
@@ -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        /* The use of the timezone is obsolete, normally tz is NULL.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)));