[PATCHv2 07/18] arm64: mm: add code to safely replace TTBR1_EL1

On Tue, Jan 05, 2016 at 03:22:18PM +0000, Catalin Marinas wrote:

On Mon, Jan 04, 2016 at 05:56:40PM +0000, Mark Rutland wrote:

quoted

+	.pushsection ".idmap.text", "ax"
+/*
+ * void idmap_cpu_replace_ttbr1(phys_addr_t new_pgd, phys_addr_t reserved_pgd)
+ *
+ * This is the low-level counterpart to cpu_replace_ttbr1, and should not be
+ * called by anything else. It can only be executed from a TTBR0 mapping.
+ */
+ENTRY(idmap_cpu_replace_ttbr1)
+	mrs	x2, daif
+	msr	daifset, #0xf
+
+	msr	ttbr1_el1, x1

Would it work to avoid the second argument and only use adrp, now that
empty_zero_page is at a fixed offset relative to this function?

Yes, it would.

I've folded that in locally.

Thanks,
Mark.