xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

sparc32, leon: Remove separate "ticker" timer for SMP

Browse Source 
This reduces the need from two timers to one timer.

Moreover, without this patch, when the "ticker" timer triggers timer_cs_read via
tick_periodic it reads the value of the usual timer it can get an wrapped timer
value without timer_cs_internal_counter having been updated leading to the clock
going backwards. This effectively hangs one cpu that gets stuck in
update_wall_time with an offset slightly smaller than 0xffffffffffffffff.

Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andreas Larsson
2013-06-10 08:53:28 +02:00
committed by David S. Miller
parent 117a0c5fc9
commit 1ffbc51a0d
3 changed files with 26 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/sparc/include/asm/leon.h
View File

@@ -135,7 +135,7 @@ static inline int sparc_leon3_cpuid(void)
#ifdef CONFIG_SMP
# define LEON3_IRQ_IPI_DEFAULT 13
# define LEON3_IRQ_TICKER (leon3_ticker_irq)
# define LEON3_IRQ_TICKER (leon3_gptimer_irq)
# define LEON3_IRQ_CROSS_CALL 15
#endif