Commit 183b73ae authored Apr 12, 2006 by Jordi Caubet Committed by Paul Mackerras Apr 13, 2006

[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>

parent f48b8296

arch/powerpc/platforms/cell/spufs/switch.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}
		}