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[PATCH] spufs: fix context-switch decrementer code 

We found that when the 'decrementer' is saved, the PPE saves the current
time 'csa->suspend_time'. When restoring the 'decrementer', (Step 34)
decrementer seems to be adjusted with the number of cycles th= at a spu
thread has not been running.

In that code it is missing a substract ('-') because 'delta_time' is
assigned a not substracted(see bellow).

Acked-by: Mark Nutter <mnutter@us.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Jordi Caubet 2006-04-12 17:44:27 +02:00 committed by Paul Mackerras
parent f48b8296b3
commit 183b73ae7c
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/platforms/cell/spufs/switch.c
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@ -1297,7 +1297,7 @@ static inline void setup_decr(struct spu_state *csa, struct spu *spu)
cycles_t resume_time = get_cycles();
cycles_t delta_time = resume_time - csa->suspend_time;
csa->lscsa->decr.slot[0] = delta_time;
csa->lscsa->decr.slot[0] -= delta_time;
}
}