This series removes "select ARCH_USES_GETTIMEOFFSET" from arch/m68k and converts users of arch_gettimeoffset to the clocksource API. Various bugs are fixed along the way.
Those platforms which do not actually implement arch_gettimeoffset (apollo, q40, sun3, sun3x) use the "jiffies" clocksource by default. The difficulty with these patches is the use of the timer interrupt to update the counter for the clock source. The timer interrupt handler races with clocksource read method, and both of those functions race with the timer hardware. Hence, more testing and code review would be appreciated. Changed since v2: - Reinstated patch "m68k: hp300: Convert to clocksource API", and added a new patch "m68k: hp300: Handle timer counter overflow" to address monotonicity issues. - Omitted a minor cleanup patch which may be merged independently. - Various other changes summarized in the relevant patches. Changed since v1: - Dropped patches 1/13 and 2/13. These were a failed attempt to fix 5cfc8ee0bb51 and 4ad4c76b7afb. By adopting the clocksource API we can fix this issue in mainline. By backporting this series we can fix it for -stable (for m68k at least). - Dropped patch "m68k: hp300: Convert to clocksource API" and added patch "m68k: hp300: Remove hp300_gettimeoffset". - Added a new patch to address an old m68k bug pointed out by Thomas Gleixner. The bug can arise when a timer interrupt handler gets interrupted. - Added new patches to address old mvme16x and mvme147 bugs pointed out by Thomas Gleixner. The bug could cause the clock to jump backwards. - Various other changes summarized in the relevant patches. Finn Thain (14): m68k: Call timer_interrupt() with interrupts disabled m68k: mac: Fix VIA timer counter accesses m68k: apollo, q40, sun3, sun3x: Remove arch_gettimeoffset implementations m68k: Drop ARCH_USES_GETTIMEOFFSET m68k: amiga: Convert to clocksource API m68k: atari: Convert to clocksource API m68k: bvme6000: Convert to clocksource API m68k: hp300: Convert to clocksource API m68k: hp300: Handle timer counter overflow m68k: mac: Convert to clocksource API m68k: mvme147: Convert to clocksource API m68k: mvme147: Handle timer counter overflow m68k: mvme16x: Convert to clocksource API m68k: mvme16x: Handle timer counter overflow arch/m68k/Kconfig | 1 - arch/m68k/amiga/cia.c | 9 ++ arch/m68k/amiga/config.c | 67 +++++++++----- arch/m68k/apollo/config.c | 7 -- arch/m68k/atari/ataints.c | 4 +- arch/m68k/atari/config.c | 2 - arch/m68k/atari/time.c | 70 +++++++++++---- arch/m68k/bvme6000/config.c | 76 ++++++++++------ arch/m68k/hp300/config.c | 1 - arch/m68k/hp300/time.c | 73 +++++++++++---- arch/m68k/hp300/time.h | 1 - arch/m68k/include/asm/mvme147hw.h | 2 +- arch/m68k/mac/config.c | 3 - arch/m68k/mac/via.c | 145 ++++++++++++++++++++---------- arch/m68k/mvme147/config.c | 73 ++++++++++----- arch/m68k/mvme16x/config.c | 97 ++++++++++++++------ arch/m68k/q40/config.c | 9 -- arch/m68k/q40/q40ints.c | 19 ++-- arch/m68k/sun3/config.c | 2 - arch/m68k/sun3/intersil.c | 7 -- arch/m68k/sun3/sun3ints.c | 3 + arch/m68k/sun3x/config.c | 1 - arch/m68k/sun3x/time.c | 21 +++-- arch/m68k/sun3x/time.h | 1 - 24 files changed, 449 insertions(+), 245 deletions(-) -- 2.18.1