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arm64: Do not synchronise I and D caches for special ptes

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commit 71fdb6bf61 upstream.

Special pte mappings are not intended to be executable and do not even
have an associated struct page. This patch ensures that we do not call
__sync_icache_dcache() on such ptes.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Steve Capper <Steve.Capper@arm.com>
Tested-by: Laura Abbott <lauraa@codeaurora.org>
Tested-by: Bharat Bhushan <Bharat.Bhushan@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(cherry picked from commit b1f2bfc9d8)
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Catalin Marinas
2014-03-12 16:28:09 +00:00
committed by Mark Brown
parent 226b19b9d3
commit 5aab0869c9
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/include/asm/pgtable.h
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@@ -161,7 +161,7 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
if (pte_valid_user(pte)) {
if (pte_exec(pte))
if (!pte_special(pte) && pte_exec(pte))
__sync_icache_dcache(pte, addr);
if (!pte_dirty(pte))
pte = pte_wrprotect(pte);