Re: [PATCH -next] drivers/base/inode.c: let vmstat_text be optional

From: Cong Wang
Date: Thu Aug 04 2011 - 22:39:39 EST


ä 2011å08æ05æ 06:22, Randy Dunlap åé:
From: Randy Dunlap<rdunlap@xxxxxxxxxxxx>

vmstat_text is only available when PROC_FS or SYSFS is enabled.
This causes build errors in drivers/base/node.c when they are
both disabled:

drivers/built-in.o: In function `node_read_vmstat':
node.c:(.text+0x10e28f): undefined reference to `vmstat_text'

Rather than litter drivers/base/node.c with #ifdef/#endif around
the affected lines of code, add macros for optional sysdev
attributes so that those lines of code will be ignored, without
using #ifdef/#endif in the .c file(s). I.e., the ifdeffery
is done only in a header file with sysdev_create_file_optional()
and sysdev_remove_file_optional().


This looks ugly for me, because other sysfs files here are not optional
only due to that they don't rely on vmstat_text.

I still think my approach to fix this is better, that is, introducing
a new Kconfig for drivers/base/node.c which depends on CONFIG_SYSFS.

Thanks.
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