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

Andy Shevchenko
2021-10-18T08:02:21Z

On Mon, Oct 18, 2021 at 6:49 AM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> On Fri, 15 Oct 2021 16:14:56 +0300 Andy Shevchenko <andriy.shevchenko@linux.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)?

Yep, thanks!
I thought that it makes sense to have STACK_MAGIC also in this header. Thoughts?

One spelling correction below.

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

instructions

> 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@canb.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

--
With Best Regards,
Andy Shevchenko