linux-kernel - [PATCH AUTOSEL 4.19 2/4] powerpc: Fix build error due to is_valid

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Date: Mon, 15 Jan 2024 18:29:27 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Michael Ellerman <mpe@...erman.id.au>,
	Sasha Levin <sashal@...nel.org>,
	christophe.leroy@...roup.eu,
	bgray@...ux.ibm.com,
	arnd@...db.de,
	naveen@...nel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH AUTOSEL 4.19 2/4] powerpc: Fix build error due to is_valid_bugaddr()

From: Michael Ellerman <mpe@...erman.id.au>

[ Upstream commit f8d3555355653848082c351fa90775214fb8a4fa ]

With CONFIG_GENERIC_BUG=n the build fails with:

  arch/powerpc/kernel/traps.c:1442:5: error: no previous prototype for ‘is_valid_bugaddr’ [-Werror=missing-prototypes]
  1442 | int is_valid_bugaddr(unsigned long addr)
       |     ^~~~~~~~~~~~~~~~

The prototype is only defined, and the function is only needed, when
CONFIG_GENERIC_BUG=y, so move the implementation under that.

Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://msgid.link/20231130114433.3053544-2-mpe@ellerman.id.au
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/kernel/traps.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 63c751ce130a..67a00131ec42 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -1341,10 +1341,12 @@ static int emulate_instruction(struct pt_regs *regs)
 	return -EINVAL;
 }
 
+#ifdef CONFIG_GENERIC_BUG
 int is_valid_bugaddr(unsigned long addr)
 {
 	return is_kernel_addr(addr);
 }
+#endif
 
 #ifdef CONFIG_MATH_EMULATION
 static int emulate_math(struct pt_regs *regs)
-- 
2.43.0