| commit | f7676254f179eac6b5244a80195ec8ae0e9d4606 | |
| author | Thomas Gleixner <tglx@linutronix.de> | |
| Sat, 6 Sep 2008 01:03:32 +0000 (6 03:03 +0200) | ||
| committer | Thomas Gleixner <tglx@linutronix.de> | |
| Sat, 6 Sep 2008 05:21:17 +0000 (6 07:21 +0200) | ||
| tree | 23074b023b683fa9940ff6543192eff2b6019350 | treesnapshot (tar.gz zip) |
| parent | 7300711e8c6824fcfbd42a126980ff50439d8dd0 | commitdiff |
x86: HPET fix moronic 32/64bit thinko
We use the HPET only in 32bit mode because:
1) some HPETs are 32bit only
2) on i386 there is no way to read/write the HPET atomic 64bit wide
The HPET code unification done by the "moron of the year" did
not take into account that unsigned long is different on 32 and
64 bit.
This thinko results in a possible endless loop in the clockevents
code, when the return comparison fails due to the 64bit/332bit
unawareness.
unsigned long cnt = (u32) hpet_read() + delta can wrap over 32bit.
but the final compare will fail and return -ETIME causing endless
loops.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
We use the HPET only in 32bit mode because:
1) some HPETs are 32bit only
2) on i386 there is no way to read/write the HPET atomic 64bit wide
The HPET code unification done by the "moron of the year" did
not take into account that unsigned long is different on 32 and
64 bit.
This thinko results in a possible endless loop in the clockevents
code, when the return comparison fails due to the 64bit/332bit
unawareness.
unsigned long cnt = (u32) hpet_read() + delta can wrap over 32bit.
but the final compare will fail and return -ETIME causing endless
loops.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| arch/x86/kernel/hpet.c | diffblobblamehistory |