linux-kernel - [PATCH] drivers/irqchip: Remove function callback casts

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Message-Id: <20200524080910.13087-1-oscar.carter@gmx.com>
Date:   Sun, 24 May 2020 10:09:10 +0200
From:   Oscar Carter <oscar.carter@....com>
To:     Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>
Cc:     kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
        Oscar Carter <oscar.carter@....com>
Subject: [PATCH] drivers/irqchip: Remove function callback casts

In an effort to enable -Wcast-function-type in the top-level Makefile to
support Control Flow Integrity builds, remove all the function callback
casts.

To do this, modify the IRQCHIP_ACPI_DECLARE macro initializing the
acpi_probe_entry struct directly instead of use the existent macro
ACPI_DECLARE_PROBE_ENTRY.

In this new initialization use the probe_subtbl field instead of the
probe_table field use in the ACPI_DECLARE_PROBE_ENTRY macro.

Signed-off-by: Oscar Carter <oscar.carter@....com>
---
 include/linux/irqchip.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/linux/irqchip.h b/include/linux/irqchip.h
index 950e4b2458f0..1f464fd10df0 100644
--- a/include/linux/irqchip.h
+++ b/include/linux/irqchip.h
@@ -39,8 +39,14 @@
  * @fn: initialization function
  */
 #define IRQCHIP_ACPI_DECLARE(name, subtable, validate, data, fn)	\
-	ACPI_DECLARE_PROBE_ENTRY(irqchip, name, ACPI_SIG_MADT, 		\
-				 subtable, validate, data, fn)
+	static const struct acpi_probe_entry __acpi_probe_##name	\
+		__used __section(__irqchip_acpi_probe_table) = {	\
+			.id = ACPI_SIG_MADT,				\
+			.type = subtable,				\
+			.subtable_valid = validate,			\
+			.probe_subtbl = (acpi_tbl_entry_handler)fn,	\
+			.driver_data = data,				\
+		}

 #ifdef CONFIG_IRQCHIP
 void irqchip_init(void);
--
2.20.1