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[SPARC64]: More fully work around Spitfire Errata 51.

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It appears that a memory barrier soon after a mispredicted
branch, not just in the delay slot, can cause the hang
condition of this cpu errata.

So move them out-of-line, and explicitly put them into
a "branch always, predict taken" delay slot which should
fully kill this problem.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2005-08-29 12:46:22 -07:00
parent 442464a500
commit 4f07118f65
14 changed files with 143 additions and 54 deletions
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22
arch/sparc64/kernel/signal32.c
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@@ -877,11 +877,12 @@ static void new_setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
unsigned long page = (unsigned long)
page_address(pte_page(*ptep));
__asm__ __volatile__(
" membar #StoreStore\n"
" flush %0 + %1"
: : "r" (page), "r" (address & (PAGE_SIZE - 1))
: "memory");
wmb();
__asm__ __volatile__("flush %0 + %1"
: /* no outputs */
: "r" (page),
"r" (address & (PAGE_SIZE - 1))
: "memory");
}
pte_unmap(ptep);
preempt_enable();
@@ -1292,11 +1293,12 @@ static void setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs,
unsigned long page = (unsigned long)
page_address(pte_page(*ptep));
__asm__ __volatile__(
" membar #StoreStore\n"
" flush %0 + %1"
: : "r" (page), "r" (address & (PAGE_SIZE - 1))
: "memory");
wmb();
__asm__ __volatile__("flush %0 + %1"
: /* no outputs */
: "r" (page),
"r" (address & (PAGE_SIZE - 1))
: "memory");
}
pte_unmap(ptep);
preempt_enable();