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Commit 71fdb6bf authored by Catalin Marinas's avatar Catalin Marinas
Browse files

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



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: default avatarCatalin Marinas <catalin.marinas@arm.com>
Reported-by: default avatarSteve Capper <Steve.Capper@arm.com>
Tested-by: default avatarLaura Abbott <lauraa@codeaurora.org>
Tested-by: default avatarBharat Bhushan <Bharat.Bhushan@freescale.com>
Cc: <stable@vger.kernel.org>
parent de2db743

arch/arm64/include/asm/pgtable.h

+1 −1
Original line number Original line Diff line number Diff line
@@ -199,7 +199,7 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 
			      pte_t *ptep, pte_t pte)

			      pte_t *ptep, pte_t pte)

{

{

	if (pte_valid_user(pte)) {

	if (pte_valid_user(pte)) {

		if (pte_exec(pte))

		if (!pte_special(pte) && pte_exec(pte))

			__sync_icache_dcache(pte, addr);

			__sync_icache_dcache(pte, addr);

		if (pte_dirty(pte) && pte_write(pte))

		if (pte_dirty(pte) && pte_write(pte))

			pte_val(pte) &= ~PTE_RDONLY;

			pte_val(pte) &= ~PTE_RDONLY;