Subject: linux-next: build failure after merge of the akpm tree

From: Stephen Rothwell <[email-masked]>
Date: Mon, 2 Mar 2020 15:23:06 +1100

Hi all,

After merging the akpm tree, today's linux-next build (powerpc
ppc64_defconfig) failed like this:

arch/powerpc/kvm/book3s_64_mmu_radix.c: In function 'debugfs_radix_read':
arch/powerpc/kvm/book3s_64_mmu_radix.c:1226:8: error: unused variable 'pgd' [-Werror=unused-variable]
 1226 |  pgd_t pgd, *pgdp;
      |        ^~~
cc1: all warnings being treated as errors

Caused by commit

  cad54c147231 ("powerpc: add support for folded p4d page tables")

I applied the following fix patch:

From: Stephen Rothwell <[email-masked]>
Date: Mon, 2 Mar 2020 15:19:40 +1100
Subject: [PATCH] fix for "powerpc: add support for folded p4d page tables"

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 arch/powerpc/kvm/book3s_64_mmu_radix.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index beb694285100..3fb598659420 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -1223,7 +1223,7 @@ static ssize_t debugfs_radix_read(struct file *file, char __user *buf,
 	unsigned long gpa;
 	pgd_t *pgt;
 	struct kvm_nested_guest *nested;
-	pgd_t pgd, *pgdp;
+	pgd_t *pgdp;
 	p4d_t p4d, *p4dp;
 	pud_t pud, *pudp;
 	pmd_t pmd, *pmdp;
-- 
2.25.0

-- 
Cheers,
Stephen Rothwell