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ARC Fixes for 3.12
* Handling unaligned access in zero delay loops * spinlock livelock fix for SMP systemC model * fixing 32bit overflow in access_ok * better setup of clockevents -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAABAgAGBQJSSP42AAoJEGnX8d3iisJeH1wP/RJMY8sJBSipS0vg8YVO/0YJ gryBNNljppc8H+SFBrgzq//+YvO3KyEibNTm17ZfDijahCfEBzXpdjoXQCW3gOt9 8MlWhvLTNHbcCwwCroKAMfXkXu1DIcwgbw7FeOWmYYkgK/GhU5TTFyQBtoUvMMDM G/nEik1rdKi9tzXMi333c43YGCxn7ezwQbNZk3vNzpFTa/CuKUobiW0ohjyiWeEw RdENsnwtxtCE9HuPqTaf0/YQnpP5EkoMZw6USHJ81/QseEgLbAst6Vh4E/g6EpLM nC/73f9VouVr3ozKxa0FgcNaF5/fJf8NaqrnbbBLuy6/kb0u0PSt061vF02gUTkA F40bqB3hD7mzvt8YjMHDMm70WT1+5q7I/qlKzxxjDtdEjLNGJt/JAMgpocV3CTww Br5x6Sq8GT1GEvM5kMm/+eUh/BZBvvLscKOmzCoI5+/PZZgttuv4Lzm29unFsgor 1axQndW4vBh49OsltJTs/mI6mRpYL5IH8J7Umy4MhENzeqBUhQLtfZmDhl7RdxpA XHDtSXEotsaoVZCsHOncleTnenv4Yc0MqyYUhQdff+tXemHGIyBH012ohbrvKP28 fJKDubTz3FzzH2CMZ4q2HyeNTQRNwG+3PpER+gKXYm38WXBgmKNzj602kaCeiadX aC7DgC+cCiD3F6mtQEak =wN+V -----END PGP SIGNATURE----- Merge tag 'arc-fixes-for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC Fixes from Vineet Gupta: - Handle unaligned access in zero delay loops - spinlock livelock fix for SMP systemC model - fix 32bit overflow in access_ok - better setup of clockevents * tag 'arc-fixes-for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: Use clockevents_config_and_register over clockevents_register_device ARC: Workaround spinlock livelock in SMP SystemC simulation ARC: Fix 32-bit wrap around in access_ok() ARC: Handle zero-overhead-loop in unaligned access handler
This commit is contained in:
commit
815a4bb18b
4 changed files with 18 additions and 8 deletions
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@ -45,7 +45,14 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock)
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static inline void arch_spin_unlock(arch_spinlock_t *lock)
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{
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lock->slock = __ARCH_SPIN_LOCK_UNLOCKED__;
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unsigned int tmp = __ARCH_SPIN_LOCK_UNLOCKED__;
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__asm__ __volatile__(
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" ex %0, [%1] \n"
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: "+r" (tmp)
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: "r"(&(lock->slock))
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: "memory");
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smp_mb();
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}
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@ -43,7 +43,7 @@
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* Because it essentially checks if buffer end is within limit and @len is
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* non-ngeative, which implies that buffer start will be within limit too.
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*
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* The reason for rewriting being, for majorit yof cases, @len is generally
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* The reason for rewriting being, for majority of cases, @len is generally
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* compile time constant, causing first sub-expression to be compile time
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* subsumed.
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*
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@ -53,7 +53,7 @@
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*
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*/
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#define __user_ok(addr, sz) (((sz) <= TASK_SIZE) && \
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(((addr)+(sz)) <= get_fs()))
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((addr) <= (get_fs() - (sz))))
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#define __access_ok(addr, sz) (unlikely(__kernel_ok) || \
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likely(__user_ok((addr), (sz))))
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@ -227,12 +227,9 @@ void __attribute__((weak)) arc_local_timer_setup(unsigned int cpu)
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{
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struct clock_event_device *clk = &per_cpu(arc_clockevent_device, cpu);
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clockevents_calc_mult_shift(clk, arc_get_core_freq(), 5);
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clk->max_delta_ns = clockevent_delta2ns(ARC_TIMER_MAX, clk);
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clk->cpumask = cpumask_of(cpu);
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clockevents_register_device(clk);
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clockevents_config_and_register(clk, arc_get_core_freq(),
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0, ARC_TIMER_MAX);
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/*
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* setup the per-cpu timer IRQ handler - for all cpus
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@ -245,6 +245,12 @@ int misaligned_fixup(unsigned long address, struct pt_regs *regs,
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regs->status32 &= ~STATUS_DE_MASK;
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} else {
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regs->ret += state.instr_len;
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/* handle zero-overhead-loop */
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if ((regs->ret == regs->lp_end) && (regs->lp_count)) {
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regs->ret = regs->lp_start;
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regs->lp_count--;
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}
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}
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return 0;
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