Patch "s390: make setup_randomness work" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

s390: make setup_randomness work

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
s390-make-setup_randomness-work.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Heiko Carstens <[email protected]>
Date: Sat, 4 Feb 2017 11:40:36 +0100
Subject: s390: make setup_randomness work

From: Heiko Carstens <[email protected]>

commit da8fd820f389a0e29080b14c61bf5cf1d8ef5ca1 upstream.

Commit bcfcbb6bae64 ("s390: add system information as device randomness") intended to add some virtual machine specific information to the randomness pool.

Unfortunately it uses the page allocator before it is ready to use. In result the page allocator always returns NULL and the setup_randomness function never adds anything to the randomness pool.

To fix this use memblock_alloc and memblock_free instead.

---
 arch/s390/kernel/setup.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

@@ -819,10 +819,10 @@ static void __init setup_randomness(void
 {
 	struct sysinfo_3_2_2 *vmms;
 
-	vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL);
-	if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count)
+	vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+	if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
 		add_device_randomness(&vmms, vmms->count);
-	free_page((unsigned long) vmms);
+	memblock_free((unsigned long) vmms, PAGE_SIZE);
 }
 
 /*

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/s390-use-correct-input-data-address-for-setup_randomness.patch queue-4.9/s390-make-setup_randomness-work.patch