kernel.git/arch/ia64/kernel/fsys.S, branch linux-3.7.y

[IA64] Liberate the signal layer from IA64 assembler

2012-05-16T21:09:55Z

Currently IA64 has a assembler implementation of sigrtprocmask. Having a single architecture implement this in assembler language is a serious maintenance problem that inhibits further evolution of the signal subsystem. Everyone who wants to do deep changes to signals would need to learn that assembler language. Whatever performance improvements IA64 gets from this it cannot be worth the price in maintainability. We have some locking problems in signal that need to be fixed, but this roadblock needs to be removed first. So just disable the special assembler IA64 implementation and fall back to a normal syscall there. Acked-by: Matt Fleming Signed-off-by: Andi Kleen Signed-off-by: Tony Luck

[IA64] Fix fast syscall version of getcpu()

2012-05-16T20:58:29Z

GETCPU(2) says: int getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache); ... When either cpu or node is NULL nothing is written to the respective pointer. But the fast system call path had no checks for NULL, and would thus return -EFAULT if either (or both) of these were NULL. Reported-by: Mike Frysinger Tested-by: Mike Frysinger Signed-off-by: Tony Luck

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2012-03-29T21:16:48Z

Pull timer core updates from Thomas Gleixner. * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: ia64: vsyscall: Add missing paranthesis alarmtimer: Don't call rtc_timer_init() when CONFIG_RTC_CLASS=n x86: vdso: Put declaration before code x86-64: Inline vdso clock_gettime helpers x86-64: Simplify and optimize vdso clock_gettime monotonic variants kernel-time: fix s/then/than/ spelling errors time: remove no_sync_cmos_clock time: Avoid scary backtraces when warning of > 11% adj alarmtimer: Make sure we initialize the rtctimer ntp: Fix leap-second hrtimer livelock x86, tsc: Skip refined tsc calibration on systems with reliable TSC rtc: Provide flag for rtc devices that don't support UIE ia64: vsyscall: Use seqcount instead of seqlock x86: vdso: Use seqcount instead of seqlock x86: vdso: Remove bogus locking in update_vsyscall_tz() time: Remove bogus comments time: Fix change_clocksource locking time: x86: Fix race switching from vsyscall to non-vsyscall clock

Disintegrate asm/system.h for IA64

2012-03-28T17:30:02Z

Disintegrate asm/system.h for IA64. Signed-off-by: David Howells Acked-by: Tony Luck cc: linux-ia64@vger.kernel.org

ia64: vsyscall: Use seqcount instead of seqlock

2012-03-16T01:17:59Z

The update of the vdso data happens under xtime_lock, so adding a nested lock is pointless. Just use a seqcount to sync the readers. Signed-off-by: Thomas Gleixner Cc: Tony Luck Signed-off-by: John Stultz

[IA64] Optimize ticket spinlocks in fsys_rt_sigprocmask

2010-09-15T22:35:48Z

Tony's fix (f574c843191728d9407b766a027f779dcd27b272) has a small bug, it incorrectly uses "r3" as a scratch register in the first of the two unlock paths ... it is also inefficient. Optimize the fast path again. Signed-off-by: Petr Tesarik Signed-off-by: Tony Luck

[IA64] fix siglock

2010-09-09T22:16:56Z

When ia64 converted to using ticket locks, an inline implementation of trylock/unlock in fsys.S was missed. This was not noticed because in most circumstances it simply resulted in using the slow path because the siglock was apparently not available (under old spinlock rules). Problems occur when the ticket spinlock has value 0x0 (when first initialised, or when it wraps around). At this point the fsys.S code acquires the lock (changing the 0x0 to 0x1. If another process attempts to get the lock at this point, it will change the value from 0x1 to 0x2 (using new ticket lock rules). Then the fsys.S code will free the lock using old spinlock rules by writing 0x0 to it. From here a variety of bad things can happen. Signed-off-by: Tony Luck

ia64/pv_ops: paravirtualize mov = ar.itc.

2009-03-26T17:50:22Z

paravirtualize mov reg = ar.itc. Signed-off-by: Isaku Yamahata Signed-off-by: Tony Luck

ia64/pv_ops: paravirtualize fsys.S.

2009-03-26T17:50:01Z

paravirtualize fsys.S. Signed-off-by: Isaku Yamahata Signed-off-by: Tony Luck

ia64/pv_ops: add hooks to paravirtualize fsyscall implementation.

2009-03-26T17:48:33Z

Add two hooks, paravirt_get_fsyscall_table() and paravirt_get_fsys_bubble_doen() to paravirtualize fsyscall implementation. This patch just add the hooks fsyscall and don't paravirtualize it. Signed-off-by: Isaku Yamahata Signed-off-by: Tony Luck