[PATCH 0/7] Add L2 cache cleaning to generic CPU suspend

[Shawn Guo]

On Mon, Sep 19, 2011 at 05:37:41PM +0100, Russell King - ARM Linux wrote:
> This is a re-post of the previous patch series, but with an additional
> TLB flush to ensure that hte global TLB entry in the page tables is
> flushed out.  This is a flush of all TLB entries, but it could probably
> be more targetted if we need to.
> 

Here is the diff on suspend.c between last post and this series.  With
the outer_clean_range() calls added back, the series works fine on
imx6q, otherwise it hangs on resume.

diff --git a/arch/arm/kernel/suspend.c b/arch/arm/kernel/suspend.c
index 4c95410..2d60f19 100644
--- a/arch/arm/kernel/suspend.c
+++ b/arch/arm/kernel/suspend.c
@@ -28,9 +28,6 @@ void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr)
        cpu_do_suspend(ptr);

        flush_cache_all();
-       outer_clean_range(*save_ptr, *save_ptr + ptrsz);
-       outer_clean_range(virt_to_phys(save_ptr),
-                         virt_to_phys(save_ptr) + sizeof(*save_ptr));
 }

 /*
@@ -52,8 +49,10 @@ int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
         * back to the correct page tables.
         */
        ret = __cpu_suspend(arg, fn);
-       if (ret == 0)
+       if (ret == 0) {
                cpu_switch_mm(mm->pgd, mm);
+               local_flush_tlb_all();
+       }

        return ret;
 }

-- 
Regards,
Shawn