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| author |   David S. Miller <davem@davemloft.net> | 2016-05-25 12:51:20 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-05-25 12:51:32 -0700 |
| commit | 9ea46abe22550e3366ff7cee2f8391b35b12f730 (patch) | |
| tree | 003c9dc20c48b0e75594c9dce095accd33ed55c4 /arch/sparc | |
| parent | Merge tag 'pwm/for-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm (diff) | |
| download | linux-dev-9ea46abe22550e3366ff7cee2f8391b35b12f730.tar.xz linux-dev-9ea46abe22550e3366ff7cee2f8391b35b12f730.zip | |
sparc64: Take ctx_alloc_lock properly in hugetlb_setup().
On cheetahplus chips we take the ctx_alloc_lock in order to
modify the TLB lookup parameters for the indexed TLBs, which
are stored in the context register.
This is called with interrupts disabled, however ctx_alloc_lock
is an IRQ safe lock, therefore we must take acquire/release it
properly with spin_{lock,unlock}_irq().
Reported-by: Meelis Roos <mroos@linux.ee>
Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/mm/init_64.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 652683cb4b4b..14bb0d5ed3c6 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -2824,9 +2824,10 @@ void hugetlb_setup(struct pt_regs *regs) * the Data-TLB for huge pages. */ if (tlb_type == cheetah_plus) { + bool need_context_reload = false; unsigned long ctx; - spin_lock(&ctx_alloc_lock); + spin_lock_irq(&ctx_alloc_lock); ctx = mm->context.sparc64_ctx_val; ctx &= ~CTX_PGSZ_MASK; ctx |= CTX_PGSZ_BASE << CTX_PGSZ0_SHIFT; @@ -2845,9 +2846,12 @@ void hugetlb_setup(struct pt_regs *regs) * also executing in this address space. */ mm->context.sparc64_ctx_val = ctx; - on_each_cpu(context_reload, mm, 0); + need_context_reload = true; } - spin_unlock(&ctx_alloc_lock); + spin_unlock_irq(&ctx_alloc_lock); + + if (need_context_reload) + on_each_cpu(context_reload, mm, 0); } } #endif |