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

From: Stephen Rothwell <[email-masked]>
Date: Thu, 29 Oct 2020 15:08:09 +1100

Hi all,

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

lib/math/div64.c: In function 'mul_u64_u64_div_u64':
lib/math/div64.c:202:6: error: implicit declaration of function 'ilog2' [-Werror=implicit-function-declaration]
  202 |  if (ilog2(a) + ilog2(b) > 62) {
      |      ^~~~~

Caused by commit

  4ec993a18ff6 ("kernel.h: Split out mathematical helpers")

I have applied the following patch for today:

From: Stephen Rothwell <[email-masked]>
Date: Thu, 29 Oct 2020 15:03:58 +1100
Subject: [PATCH] kernel.h: Split out mathematical helpers fix

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 lib/math/div64.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/math/div64.c b/lib/math/div64.c
index dcc826c40ca1..064d68a5391a 100644
--- a/lib/math/div64.c
+++ b/lib/math/div64.c
@@ -22,6 +22,7 @@
 #include <linux/export.h>
 #include <linux/math.h>
 #include <linux/math64.h>
+#include <linux/log2.h>
 
 /* Not needed on 64bit architectures */
 #if BITS_PER_LONG == 32
-- 
2.28.0

-- 
Cheers,
Stephen Rothwell