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Message-ID: <df54d8ab-514d-409f-8522-b0790a12b953@paulmck-laptop>
Date: Tue, 28 May 2024 12:26:43 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [paulmck-rcu:dev.2024.05.18a 44/51] update.c:undefined reference
to `cmpxchg_emu_u8'
On Mon, May 27, 2024 at 01:25:58PM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2024.05.18a
> head: 0e3eb8082184e066eb389f5e6f9c7b8c2d452d66
> commit: c48887df74a95090e633a29ffbcef00b71cdab66 [44/51] rcu-tasks: Remove open-coded one-byte cmpxchg() emulation
> config: um-allyesconfig (https://download.01.org/0day-ci/archive/20240527/202405271352.XYjxKyUi-lkp@intel.com/config)
> compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240527/202405271352.XYjxKyUi-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202405271352.XYjxKyUi-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> /usr/bin/ld: kernel/rcu/update.o: in function `rcu_trc_cmpxchg_need_qs':
> >> update.c:(.text+0x27d5): undefined reference to `cmpxchg_emu_u8'
> /usr/bin/ld: kernel/rcu/update.o: in function `trc_read_check_handler':
> update.c:(.text+0x2839): undefined reference to `cmpxchg_emu_u8'
> >> /usr/bin/ld: update.c:(.text+0x2882): undefined reference to `cmpxchg_emu_u8'
> /usr/bin/ld: kernel/rcu/update.o: in function `trc_inspect_reader':
> update.c:(.text+0x52ce): undefined reference to `cmpxchg_emu_u8'
> /usr/bin/ld: update.c:(.text+0x5330): undefined reference to `cmpxchg_emu_u8'
> /usr/bin/ld: kernel/rcu/update.o:update.c:(.text+0x5933): more undefined references to `cmpxchg_emu_u8' follow
> >> collect2: error: ld returned 1 exit status
Good catch!!!
Does the patch below clear this up?
Thanx, Paul
------------------------------------------------------------------------
commit 47450c70303a11da1bd650403844ad9e688f05a4
Author: Paul E. McKenney <paulmck@...nel.org>
Date: Tue May 28 12:15:06 2024 -0700
um: Emulate one-byte cmpxchg
Use the new cmpxchg_emu_u8() to emulate one-byte cmpxchg() on um.
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/all/202405271352.XYjxKyUi-lkp@intel.com/
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Richard Weinberger <richard@....at>
Cc: Anton Ivanov <anton.ivanov@...bridgegreys.com>
Cc: Johannes Berg <johannes@...solutions.net>
Cc: <linux-um@...ts.infradead.org>
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 93a5a8999b07e..5fc55e1d71122 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -11,6 +11,7 @@ config UML
select ARCH_HAS_KCOV
select ARCH_HAS_STRNCPY_FROM_USER
select ARCH_HAS_STRNLEN_USER
+ select ARCH_NEED_CMPXCHG_1_EMU
select ARCH_NO_PREEMPT
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_KASAN if X86_64
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