linux-kernel - [PATCH] parisc/kprobes: always include asm-generic/kprobes.h

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Message-Id: <20240211230945.297104-1-max.kellermann@ionos.com>
Date: Mon, 12 Feb 2024 00:09:45 +0100
From: Max Kellermann <max.kellermann@...os.com>
To: svens@...ckframe.org,
	James.Bottomley@...senPartnership.com,
	deller@....de,
	mcgrof@...nel.org,
	linux-parisc@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Max Kellermann <max.kellermann@...os.com>
Subject: [PATCH] parisc/kprobes: always include asm-generic/kprobes.h

The NOKPROBE_SYMBOL macro (and others) were moved to
asm-generic/kprobes.h in 2017 by commit 7d134b2ce639 ("kprobes: move
kprobe declarations to asm-generic/kprobes.h"), and this new header
was included by asm/kprobes.h unconditionally on all architectures.

When kprobe support was added to parisc in 2017 by commit
8858ac8e9e9b1 ("parisc: Implement kprobes"), that header was only
included when CONFIG_KPROBES was enabled.

This can lead to build failures when NOKPROBE_SYMBOL is used, but
CONFIG_KPROBES is disabled.  This mistake however was never actually
noticed because linux/kprobes.h also includes asm-generic/kprobes.h
(though I do not understand why that is, because it also includes
asm/kprobes.h).

To prevent eventual build failures, I suggest to always include
asm-generic/kprobes.h on parisc, just like all the other architectures
do.  This way, including asm/kprobes.h suffices, and nobody (outside
of arch/) ever needs to explicitly include asm-generic/kprobes.h.

Signed-off-by: Max Kellermann <max.kellermann@...os.com>
---
 arch/parisc/include/asm/kprobes.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/parisc/include/asm/kprobes.h b/arch/parisc/include/asm/kprobes.h
index 0a175ac87698..0f42f5c8e3b6 100644
--- a/arch/parisc/include/asm/kprobes.h
+++ b/arch/parisc/include/asm/kprobes.h
@@ -10,9 +10,10 @@
 #ifndef _PARISC_KPROBES_H
 #define _PARISC_KPROBES_H

+#include <asm-generic/kprobes.h>
+
 #ifdef CONFIG_KPROBES

-#include <asm-generic/kprobes.h>
 #include <linux/types.h>
 #include <linux/ptrace.h>
 #include <linux/notifier.h>
-- 
2.39.2