linux-kernel - Re: [PATCH] locking/lockdep: Dump state of percpu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180710092034.GA29846@arm.com>
Date:   Tue, 10 Jul 2018 10:20:34 +0100
From:   Will Deacon <will.deacon@....com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     kbuild test robot <lkp@...el.com>, kbuild-all@...org,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] locking/lockdep: Dump state of percpu_rwsem upon hung up.

On Tue, Jul 10, 2018 at 03:10:51PM +0900, Tetsuo Handa wrote:
> From 2642b4a1904259384f2018ea8df03ac49509c57a Mon Sep 17 00:00:00 2001
> From: Tetsuo Handa <penguin-kernel@...ove.SKAURA.ne.jp>
> Date: Tue, 10 Jul 2018 15:01:20 +0900
> Subject: [PATCH] locking/rwsem: Convert the other sem->count to 'atomic_long_t'
> 
> Since "locking/rwsem: Convert sem->count to 'atomic_long_t'" forgot to
> convert "struct rw_semaphore"->count in linux/rwsem-spinlock.h which is
> used when CONFIG_RWSEM_GENERIC_SPINLOCK=y, trying to access it in MIPS
> architecture causes build error due to type mismatch.
> 
>   error: passing argument 1 of 'atomic_long_read' from incompatible pointer type [-Werror=incompatible-pointer-types]
>   note: expected 'const atomic_long_t * {aka const struct <anonymous> *}' but argument is of type '__s32 * {aka int *}'
> 
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SKAURA.ne.jp>
> Reported-by: kbuild test robot <lkp@...el.com>
> Fixes: 8ee62b1870be8e63 ("locking/rwsem: Convert sem->count to 'atomic_long_t'")
> Cc: stable <stable@...r.kernel.org> # v4.8+
> Cc: Jason Low <jason.low2@....com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> ---
>  include/linux/rwsem-spinlock.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Hmm, how come you don't have to update kernel/locking/rwsem-spinlock.c
as well? I see stuff such as:

	sem->count += woken;

in there.

Will