linux-kernel - Re: linux-next: build failure after merge of the akpm-current tree

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Message-ID: <20211018133538.2a0dec43@canb.auug.org.au>
Date:   Mon, 18 Oct 2021 13:35:38 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the akpm-current tree

Hi Andy,

On Fri, 15 Oct 2021 16:14:56 +0300 Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
>
> Thanks! As a quick fix looks good, but I think we need a separate header for
> those _*_IP_ macros.

Like this (on top of my previous fix - which I assume Andrew will
squash out of existence)?

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Mon, 18 Oct 2021 13:27:54 +1100
Subject: [PATCH] kernel.h: split out instrcutions pointer accessors

botton_half.h needs _THIS_IP_ to be standalone, so split that and _RET_IP_
out from kernel.h into the new instruction_pointer.h.  kernel.h directly
needs them, so include it there and replace the include of kernel.h with
this new file in bottom_half.h.

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 include/linux/bottom_half.h         | 2 +-
 include/linux/instruction_pointer.h | 8 ++++++++
 include/linux/kernel.h              | 4 +---
 3 files changed, 10 insertions(+), 4 deletions(-)
 create mode 100644 include/linux/instruction_pointer.h

diff --git a/include/linux/bottom_half.h b/include/linux/bottom_half.h
index 11d107d88d03..fc53e0ad56d9 100644
--- a/include/linux/bottom_half.h
+++ b/include/linux/bottom_half.h
@@ -2,7 +2,7 @@
 #ifndef _LINUX_BH_H
 #define _LINUX_BH_H
 
-#include <linux/kernel.h>
+#include <linux/instruction_pointer.h>
 #include <linux/preempt.h>
 
 #if defined(CONFIG_PREEMPT_RT) || defined(CONFIG_TRACE_IRQFLAGS)
diff --git a/include/linux/instruction_pointer.h b/include/linux/instruction_pointer.h
new file mode 100644
index 000000000000..19e979425bda
--- /dev/null
+++ b/include/linux/instruction_pointer.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_INSTRUCTION_POINTER_H
+#define _LINUX_INSTRUCTION_POINTER_H
+
+#define _RET_IP_		(unsigned long)__builtin_return_address(0)
+#define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })
+
+#enfif /* _LINUX_INSTRUCTION_POINTER_H */
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 973c61ff2ef9..be84ab369650 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -20,6 +20,7 @@
 #include <linux/printk.h>
 #include <linux/build_bug.h>
 #include <linux/static_call_types.h>
+#include <linux/instruction_pointer.h>
 #include <asm/byteorder.h>
 
 #include <uapi/linux/kernel.h>
@@ -53,9 +54,6 @@
 }					\
 )
 
-#define _RET_IP_		(unsigned long)__builtin_return_address(0)
-#define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })
-
 /**
  * upper_32_bits - return bits 32-63 of a number
  * @n: the number we're accessing
-- 
2.33.0

There are, presumably, other places this new file can be included ...

-- 
Cheers,
Stephen Rothwell

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