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kernel.h: split out instruction pointer accessors

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bottom_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.

Link: https://lkml.kernel.org/r/20211028161248.45232-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stephen Rothwell 2021-11-08 18:32:43 -08:00 • committed by Linus Torvalds
parent b4b8765110
commit e52340de11
3 changed files with 10 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/bottom_half.h
View file

@ -2,7 +2,7 @@
#ifndef _LINUX_BH_H #ifndef _LINUX_BH_H
#define _LINUX_BH_H #define _LINUX_BH_H
#include <linux/kernel.h> #include <linux/instruction_pointer.h>
#include <linux/preempt.h> #include <linux/preempt.h>
#if defined(CONFIG_PREEMPT_RT) || defined(CONFIG_TRACE_IRQFLAGS) #if defined(CONFIG_PREEMPT_RT) || defined(CONFIG_TRACE_IRQFLAGS)

8
include/linux/instruction_pointer.h Normal file
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@ -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; })
#endif /* _LINUX_INSTRUCTION_POINTER_H */

4
include/linux/kernel.h
View file

@ -20,6 +20,7 @@
#include <linux/printk.h> #include <linux/printk.h>
#include <linux/build_bug.h> #include <linux/build_bug.h>
#include <linux/static_call_types.h> #include <linux/static_call_types.h>
#include <linux/instruction_pointer.h>
#include <asm/byteorder.h> #include <asm/byteorder.h>
#include <uapi/linux/kernel.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 * upper_32_bits - return bits 32-63 of a number
* @n: the number we're accessing * @n: the number we're accessing