4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Paul Burton paul.burton@imgtec.com
commit 00578cd864d45ae4b8fa3f684f8d6f783dd8d15d upstream.
We don't really need gic_get_usm_range() to abstract discovery of the address of the GIC user-visible section now that we have access to its base address globally.
Switch to calculating it ourselves, which will allow us to stop requiring the irqchip driver to care about a counter exposed to userland for use via the VDSO.
Signed-off-by: Paul Burton paul.burton@imgtec.com Cc: Jason Cooper jason@lakedaemon.net Cc: Marc Zyngier marc.zyngier@arm.com Cc: Thomas Gleixner tglx@linutronix.de Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/17040/ Signed-off-by: Ralf Baechle ralf@linux-mips.org Signed-off-by: SZ Lin (林上智) sz.lin@moxa.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/mips/kernel/vdso.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-)
--- a/arch/mips/kernel/vdso.c +++ b/arch/mips/kernel/vdso.c @@ -13,7 +13,6 @@ #include <linux/err.h> #include <linux/init.h> #include <linux/ioport.h> -#include <linux/irqchip/mips-gic.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/sched.h> @@ -21,6 +20,7 @@ #include <linux/timekeeper_internal.h>
#include <asm/abi.h> +#include <asm/mips-cps.h> #include <asm/page.h> #include <asm/vdso.h>
@@ -101,9 +101,8 @@ int arch_setup_additional_pages(struct l { struct mips_vdso_image *image = current->thread.abi->vdso; struct mm_struct *mm = current->mm; - unsigned long gic_size, vvar_size, size, base, data_addr, vdso_addr; + unsigned long gic_size, vvar_size, size, base, data_addr, vdso_addr, gic_pfn; struct vm_area_struct *vma; - struct resource gic_res; int ret;
if (down_write_killable(&mm->mmap_sem)) @@ -127,7 +126,7 @@ int arch_setup_additional_pages(struct l * only map a page even though the total area is 64K, as we only need * the counter registers at the start. */ - gic_size = gic_present ? PAGE_SIZE : 0; + gic_size = mips_gic_present() ? PAGE_SIZE : 0; vvar_size = gic_size + PAGE_SIZE; size = vvar_size + image->size;
@@ -168,13 +167,9 @@ int arch_setup_additional_pages(struct l
/* Map GIC user page. */ if (gic_size) { - ret = gic_get_usm_range(&gic_res); - if (ret) - goto out; + gic_pfn = virt_to_phys(mips_gic_base + MIPS_GIC_USER_OFS) >> PAGE_SHIFT;
- ret = io_remap_pfn_range(vma, base, - gic_res.start >> PAGE_SHIFT, - gic_size, + ret = io_remap_pfn_range(vma, base, gic_pfn, gic_size, pgprot_noncached(PAGE_READONLY)); if (ret) goto out;