linux-kernel - Fwd: Where MAX_NR_ZONES defined in Suse 12.3 4.4.131-94.

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Message-ID: <CAJUuSvFurAMf29uACB3OeF6mY+VhWU1bQy_WgNLgZO8mHz4XjQ@mail.gmail.com>
Date:   Tue, 25 Sep 2018 16:18:31 +0300
From:   Ilan Schwarts <ilan84@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: Fwd: Where MAX_NR_ZONES defined in Suse 12.3 4.4.131-94.

Hi,
I maintain kernel module, till today, when compiling the kernel
module, I use to download kernel sources (headers are not enough since
i had to include btrfs code), and compile it.

In suse 12.3 (4.4.131-94.29-default), I downloaded the source package
(kernel-source-4.4.131-94.29.1.src.rpm), extract linux-4.4.tar.xz out
of it, copy to /usr/src/4.4.131-94.29 and update symbolic link from
/lib/modules/4.4.131-94.29-default/source to source ->
/usr/src/linux-4.4.131-94.29

When compiling I get the following exception:
/usr/src/linux-4.4.131-94.29/include/linux/page-flags-layout.h:21:2:
error: #error ZONES_SHIFT -- too many zones configured adjust
calculation
 #error ZONES_SHIFT -- too many zones configured adjust calculation

I assume MAX_NR_ZONES is not defined.
How could that be ?

The code for page-flags-layout.h line 21 is:
#if MAX_NR_ZONES < 2
#define ZONES_SHIFT 0
#elif MAX_NR_ZONES <= 2
#define ZONES_SHIFT 1
#elif MAX_NR_ZONES <= 4
#define ZONES_SHIFT 2
#else
#error ZONES_SHIFT -- too many zones configured adjust calculation
#endif