Commit 9ea46abe authored by David S. Miller's avatar David S. Miller
Browse files

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: default avatarMeelis Roos <mroos@linux.ee>
Tested-by: default avatarMeelis Roos <mroos@linux.ee>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ecc5fbd5
......@@ -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
......
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