linux-kernel - Re: arm64: pointer_auth.h:40:3: error: implicit declaration of function ‘get_random_bytes’; did you mean ‘get_random

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Date:   Thu, 30 Jul 2020 22:43:39 +0300
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
CC:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        "Theodore Ts'o" <tytso@....edu>, Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Brown <broonie@...nel.org>,
        Richard Henderson <richard.henderson@...aro.org>,
        open list <linux-kernel@...r.kernel.org>,
        <lkft-triage@...ts.linaro.org>, Emese Revfy <re.emese@...il.com>,
        <hsinyi@...omium.org>, Will Deacon <will@...nel.org>,
        Willy Tarreau <w@....eu>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: arm64: pointer_auth.h:40:3: error: implicit declaration of function ‘get_random_bytes’; did you mean ‘get_random_once’?



On 30/07/2020 22:40, Linus Torvalds wrote:
> On Thu, Jul 30, 2020 at 12:05 PM Grygorii Strashko
> <grygorii.strashko@...com> wrote:
>>
>> FYI. Below diff seems fixes build:
> 
> Thanks, I'll do that instead, it looks like the right thing to do regardless.
> 
> Mind sending me a sign-off for it (and commit message would be lovely
> too, but I can make something up)? Yeah, it's just a one-liner, but
> let's do this right.

I've also boot-tested it on Keystone 2 platforms.

Best regards,
grygorii

---
 From fa1238a8e4b7c603fcc0fb5f6169c212035aef4f Mon Sep 17 00:00:00 2001
From: Grygorii Strashko <grygorii.strashko@...com>
Date: Thu, 30 Jul 2020 22:05:01 +0300
Subject: [PATCH] ARM: percpu.h: fix build error
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Fix build error for the case:
  defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6)

config: keystone_defconfig

CC      arch/arm/kernel/signal.o
In file included from ../include/linux/random.h:14,
                  from ../arch/arm/kernel/signal.c:8:
../arch/arm/include/asm/percpu.h: In function ‘__my_cpu_offset’:
../arch/arm/include/asm/percpu.h:29:34: error: ‘current_stack_pointer’ undeclared (first use in this function); did you mean ‘user_stack_pointer’?
    : "Q" (*(const unsigned long *)current_stack_pointer));
                                   ^~~~~~~~~~~~~~~~~~~~~
                                   user_stack_pointer

Fixes: f227e3ec3b5c ("random32: update the net random state on interrupt and activity")
Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
---
  arch/arm/include/asm/percpu.h | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/arch/arm/include/asm/percpu.h b/arch/arm/include/asm/percpu.h
index f44f448537f2..1a3eedbac4a2 100644
--- a/arch/arm/include/asm/percpu.h
+++ b/arch/arm/include/asm/percpu.h
@@ -5,6 +5,8 @@
  #ifndef _ASM_ARM_PERCPU_H_
  #define _ASM_ARM_PERCPU_H_
  
+#include <asm/thread_info.h>
+
  /*
   * Same as asm-generic/percpu.h, except that we store the per cpu offset
   * in the TPIDRPRW. TPIDRPRW only exists on V6K and V7
-- 
2.17.1