linux-kernel - 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 16:25:49 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     linux-arm-kernel@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>, re.emese@...il.com,
        Kees Cook <keescook@...omium.org>, w@....eu,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>, hsinyi@...omium.org,
        "Theodore Ts'o" <tytso@....edu>, richard.henderson@...aro.org
Subject: arm64: pointer_auth.h:40:3: error: implicit declaration of function ‘get_random_bytes’; did you mean ‘get_random_once’?

Linus master branch failed to build the arm64 architecture due to
below error and warnings.

kernel config:
https://builds.tuxbuild.com/Dp3s1p4uYnGpImQwCvhzEw/kernel.config

git_repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
target_arch: arm64
toolchain: gcc-9
git_short_log:
83bdc7275e62 (\random32: remove net_rand_state from the latent entropy
gcc plugin\)
git_describe: v5.8-rc7-40-g83bdc7275e62

make -sk KBUILD_BUILD_USER=TuxBuild -C/linux -j16 ARCH=arm64
CROSS_COMPILE=aarch64-linux-gnu- HOSTCC=gcc CC="sccache
aarch64-linux-gnu-gcc" O=build Image
#
In file included from ../arch/arm64/include/asm/smp.h:33,
                 from ../include/linux/smp.h:82,
                 from ../include/linux/percpu.h:7,
                 from ../include/linux/random.h:14,
                 from ../arch/arm64/kernel/pointer_auth.c:5:
../arch/arm64/include/asm/pointer_auth.h: In function ‘ptrauth_keys_init_user’:
../arch/arm64/include/asm/pointer_auth.h:40:3: error: implicit
declaration of function ‘get_random_bytes’; did you mean
‘get_random_once’? [-Werror=implicit-function-declaration]
   40 |   get_random_bytes(&keys->apia, sizeof(keys->apia));
      |   ^~~~~~~~~~~~~~~~
      |   get_random_once
In file included from ../arch/arm64/kernel/pointer_auth.c:5:
../include/linux/random.h: At top level:
../include/linux/random.h:41:13: warning: conflicting types for
‘get_random_bytes’
   41 | extern void get_random_bytes(void *buf, int nbytes);
      |             ^~~~~~~~~~~~~~~~
In file included from ../arch/arm64/include/asm/smp.h:33,
                 from ../include/linux/smp.h:82,
                 from ../include/linux/percpu.h:7,
                 from ../include/linux/random.h:14,
                 from ../arch/arm64/kernel/pointer_auth.c:5:
../arch/arm64/include/asm/pointer_auth.h:40:3: note: previous implicit
declaration of ‘get_random_bytes’ was here
   40 |   get_random_bytes(&keys->apia, sizeof(keys->apia));
      |   ^~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

build log link,
https://gitlab.com/Linaro/lkft/kernel-runs/-/jobs/662908458

-- 
Linaro LKFT
https://lkft.linaro.org