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| author | David S. Miller <davem@davemloft.net> | 2015-07-14 03:28:09 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-07-14 03:28:09 +0300 |
| commit | 638d3c63811e31b2745f7fdd568b38c8abcffe03 (patch) | |
| tree | 606426ab4de84e59c5f50e1e3cce6e24819d45af /arch/x86/kernel/tsc.c | |
| parent | 74fe61f17e999a458d5f64ca2aa9a0282ca32198 (diff) | |
| parent | f760b87f8f12eb262f14603e65042996fe03720e (diff) | |
| download | linux-638d3c63811e31b2745f7fdd568b38c8abcffe03.tar.xz | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts:
net/bridge/br_mdb.c
Minor conflict in br_mdb.c, in 'net' we added a memset of the
on-stack 'ip' variable whereas in 'net-next' we assign a new
member 'vid'.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/x86/kernel/tsc.c')
| -rw-r--r-- | arch/x86/kernel/tsc.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 505449700e0c..7437b41f6a47 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -598,10 +598,19 @@ static unsigned long quick_pit_calibrate(void) if (!pit_expect_msb(0xff-i, &delta, &d2)) break; + delta -= tsc; + + /* + * Extrapolate the error and fail fast if the error will + * never be below 500 ppm. + */ + if (i == 1 && + d1 + d2 >= (delta * MAX_QUICK_PIT_ITERATIONS) >> 11) + return 0; + /* * Iterate until the error is less than 500 ppm */ - delta -= tsc; if (d1+d2 >= delta >> 11) continue; |