linux-kernel - [PATCH v2] ACPI: move acpi_no_s4_hw_signature() declaration into #ifdef CONFIG

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Message-Id: <1350365052-27304-1-git-send-email-yuanhan.liu@linux.intel.com>
Date:	Tue, 16 Oct 2012 13:24:12 +0800
From:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
To:	lenb@...nel.org
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	fengguang.wu@...el.com, Yuanhan Liu <yuanhan.liu@...ux.intel.com>
Subject: [PATCH v2] ACPI: move acpi_no_s4_hw_signature() declaration into #ifdef CONFIG_HIBERNATION

acpi_no_s4_hw_signature is defined in #ifdef CONFIG_HIBERNATION block,
but the current code put the declaration in #ifdef CONFIG_PM_SLEEP block.

I happened to meet this issue when I turned off PM_SLEEP config manually:
arch/x86/kernel/acpi/sleep.c:100:4: error: implicit declaration of function ‘acpi_no_s4_hw_signature’ [-Werror=implicit-function-declaration]

v2: take better title and add build error message suggested by Fengguang

Signed-off-by: Yuanhan Liu <yuanhan.liu@...ux.intel.com>
Reviewed-by: Fengguang Wu <fengguang.wu@...el.com>
---
 include/linux/acpi.h |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 90be989..a468429 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -257,8 +257,11 @@ int acpi_check_region(resource_size_t start, resource_size_t n,
 
 int acpi_resources_are_enforced(void);
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_HIBERNATION
 void __init acpi_no_s4_hw_signature(void);
+#endif
+
+#ifdef CONFIG_PM_SLEEP
 void __init acpi_old_suspend_ordering(void);
 void __init acpi_nvs_nosave(void);
 #endif /* CONFIG_PM_SLEEP */
-- 
1.7.7.6

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