From: Doug Goldstein <cardoe@cardoe.com>
To: Shannon Zhao <zhaoshenglong@huawei.com>, xen-devel@lists.xen.org
Cc: shannon.zhao@linaro.org, jbeulich@suse.com, peter.huangpeng@huawei.com
Subject: Re: [PATCH v6 1/3] Kconfig: import kconfig.h from Linux 4.3
Date: Sat, 30 Jan 2016 22:08:15 -0600 [thread overview]
Message-ID: <56AD88AF.5020800@cardoe.com> (raw)
In-Reply-To: <1454147250-7704-2-git-send-email-zhaoshenglong@huawei.com>
[-- Attachment #1.1: Type: text/plain, Size: 2103 bytes --]
On 1/30/16 3:47 AM, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@linaro.org>
>
> To support using CONFIG_ options in C/CPP expressions, import kconfig.h
> from the Linux v4.3 tag (commit id
> 6a13feb9c82803e2b815eca72fa7a9f5561d7861).
> Only import IS_ENABLED for Xen since Xen doesn't support loadable
> modules.
>
> CC: Doug Goldstein <cardoe@cardoe.com>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Doug Goldstein <cardoe@cardoe.com>
> ---
> xen/include/xen/kconfig.h | 31 +++++++++++++++++++++++++++++++
> 1 file changed, 31 insertions(+)
> create mode 100644 xen/include/xen/kconfig.h
>
> diff --git a/xen/include/xen/kconfig.h b/xen/include/xen/kconfig.h
> new file mode 100644
> index 0000000..4d58c5b
> --- /dev/null
> +++ b/xen/include/xen/kconfig.h
> @@ -0,0 +1,31 @@
> +#ifndef __XEN_KCONFIG_H
> +#define __XEN_KCONFIG_H
> +
> +#include <generated/autoconf.h>
> +
> +/*
> + * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
> + * these only work with boolean option.
> + */
> +
> +/*
> + * Getting something that works in C and CPP for an arg that may or may
> + * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1"
> + * we match on the placeholder define, insert the "0," for arg1 and generate
> + * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one).
> + * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
> + * the last step cherry picks the 2nd arg, we get a zero.
> + */
> +#define __ARG_PLACEHOLDER_1 0,
> +#define config_enabled(cfg) _config_enabled(cfg)
> +#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
> +#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
> +#define ___config_enabled(__ignored, val, ...) val
> +
> +/*
> + * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
> + * otherwise.
> + */
> +#define IS_ENABLED(option) config_enabled(option)
> +
> +#endif /* __XEN_KCONFIG_H */
>
--
Doug Goldstein
[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 959 bytes --]
[-- Attachment #2: Type: text/plain, Size: 126 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2016-01-31 4:08 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-30 9:47 [PATCH v6 0/3] Refactor DT specific codes preparing for ACPI support on ARM64 Shannon Zhao
2016-01-30 9:47 ` [PATCH v6 1/3] Kconfig: import kconfig.h from Linux 4.3 Shannon Zhao
2016-01-31 4:08 ` Doug Goldstein [this message]
2016-01-30 9:47 ` [PATCH v6 2/3] ACPI: add config for BIOS table scan Shannon Zhao
2016-01-31 4:10 ` Doug Goldstein
2016-02-04 17:16 ` Stefano Stabellini
2016-01-30 9:47 ` [PATCH v6 3/3] acpi: Refactor acpi_os_map_memory to be architecturally independent Shannon Zhao
2016-02-04 17:14 ` Stefano Stabellini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=56AD88AF.5020800@cardoe.com \
--to=cardoe@cardoe.com \
--cc=jbeulich@suse.com \
--cc=peter.huangpeng@huawei.com \
--cc=shannon.zhao@linaro.org \
--cc=xen-devel@lists.xen.org \
--cc=zhaoshenglong@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.