linux-kernel - Re: [PATCH] um: Avoid longjmp/setjmp symbol clashes with libpthread.a

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Message-ID: <40707918-8ba1-9651-a6e4-504ee1baa9e6@gmail.com>
Date:   Tue, 23 May 2017 16:03:58 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-devel@...ts.sourceforge.net>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-user@...ts.sourceforge.net>
Subject: Re: [PATCH] um: Avoid longjmp/setjmp symbol clashes with libpthread.a

On 05/23/2017 02:08 PM, Florian Fainelli wrote:
> Building a statically linked UML kernel on a Centos 6.9 host resulted in
> the following linking failure (GCC 4.4, glibc-2.12):
> 
> /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
> In function `siglongjmp':
> (.text+0x8490): multiple definition of `longjmp'
> arch/x86/um/built-in.o:/local/users/fainelli/openwrt/trunk/build_dir/target-x86_64_musl/linux-uml/linux-4.4.69/arch/x86/um/setjmp_64.S:44:
> first defined here
> /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
> In function `sem_open':
> (.text+0x77cd): warning: the use of `mktemp' is dangerous, better use
> `mkstemp'
> collect2: ld returned 1 exit status
> make[4]: *** [vmlinux] Error 1
> 
> Adopt a solution similar to the one done for vmap where we define
> longjmp/setjmp to be kernel_longjmp/setjmp. In the process, make sure we
> do rename the functions in arch/x86/um/setjmp_*.S accordingly.
> 
> Fixes: a7df4716d195 ("um: link with -lpthread")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---

> -	.globl longjmp
> -	.type longjmp, @function
> -longjmp:
> +	.globl kernel_jongjmp
> +	.type kernel_jongjmp, @function
> +kernel_jongjmp:

Dyslexia at its finest, I will submit a corrected v2, the perils of
switching between machines....

-- 
Florian