We get 1 warning when building kernel withW=1:
arch/x86/boot/compressed/cpuflags.c:4:6: warning: no previous prototype for ‘has_cpuflag’ [-Werror=missing-prototypes]
    4 | bool has_cpuflag(int flag)
      |      ^~~~~~~~~~~
Add a function declaration to cpuflags.h

Signed-off-by: Zhou Ding <zhouding@cmss.chinamobile.com>
---
 arch/x86/boot/cpuflags.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/boot/cpuflags.h b/arch/x86/boot/cpuflags.h
index 475b8fde90f7..fdcc2aa4c3c4 100644
--- a/arch/x86/boot/cpuflags.h
+++ b/arch/x86/boot/cpuflags.h
@@ -18,5 +18,6 @@ extern u32 cpu_vendor[3];
 int has_eflag(unsigned long mask);
 void get_cpuflags(void);
 void cpuid_count(u32 id, u32 count, u32 *a, u32 *b, u32 *c, u32 *d);
+bool has_cpuflag(int flag);
 
 #endif
-- 
2.33.0

The following commit has been merged into the x86/boot branch of tip:

Commit-ID:     7d8f03f7dd9f7d108b8d5af12fdc57e10555981f
Gitweb:        https://git.kernel.org/tip/7d8f03f7dd9f7d108b8d5af12fdc57e10555981f
Author:        Zhou Ding <zhouding@cmss.chinamobile.com>
AuthorDate:    Wed, 18 Dec 2024 00:28:59 +08:00
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Wed, 26 Feb 2025 15:40:23 +01:00

x86/boot: Add missing has_cpuflag() prototype

We get a warning when building the kernel with W=1:

  arch/x86/boot/compressed/cpuflags.c:4:6: warning: no previous prototype for ‘has_cpuflag’ [-Werror=missing-prototypes]
      4 | bool has_cpuflag(int flag)
        |      ^~~~~~~~~~~

Add a function declaration to cpuflags.h

Signed-off-by: Zhou Ding <zhouding@cmss.chinamobile.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20241217162859.1167889-1-zhouding@cmss.chinamobile.com
---
 arch/x86/boot/cpuflags.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/boot/cpuflags.h b/arch/x86/boot/cpuflags.h
index 475b8fd..fdcc2aa 100644
--- a/arch/x86/boot/cpuflags.h
+++ b/arch/x86/boot/cpuflags.h
@@ -18,5 +18,6 @@ extern u32 cpu_vendor[3];
 int has_eflag(unsigned long mask);
 void get_cpuflags(void);
 void cpuid_count(u32 id, u32 count, u32 *a, u32 *b, u32 *c, u32 *d);
+bool has_cpuflag(int flag);
 
 #endif