linux-hardening - [PATCH v1] x86: suppress warning generated by W=1

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Date:   Thu,  9 Mar 2023 18:48:54 +0100
From:   Vincenzo Palazzo <vincenzopalazzodev@...il.com>
To:     x86@...nel.org
Cc:     luto@...nel.org, linux-hardening@...r.kernel.org,
        Vincenzo Palazzo <vincenzopalazzodev@...il.com>
Subject: [PATCH v1] x86: suppress warning generated by W=1

suppress unused warnings and fix the error that there is
with the W=1 enabled.

Warning generated

arch/x86/entry/common.c:238:24: error: no previous prototype for ‘do_SYSENTER_32’ [-Werror=missing-prototypes]
  238 | __visible noinstr long do_SYSENTER_32(struct pt_regs *regs)

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@...il.com>
---
 arch/x86/entry/common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 6c2826417b33..8f17b2c3e9de 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -234,6 +234,9 @@ __visible noinstr long do_fast_syscall_32(struct pt_regs *regs)
 #endif
 }
 
+/* prototype is a placeholder to suppress the missing prototype worning */
+long do_SYSENTER_32(struct pt_regs *regs);
+
 /* Returns 0 to return using IRET or 1 to return using SYSEXIT/SYSRETL. */
 __visible noinstr long do_SYSENTER_32(struct pt_regs *regs)
 {
-- 
2.39.2