linux-kernel - Build error due to commit 8ab2ae655b ("default exported asm symbols to zero")

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Date:   Mon, 5 Dec 2016 13:23:56 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Cc:     Adam Borowski <kilobyte@...band.pl>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Build error due to commit 8ab2ae655b ("default exported asm symbols
 to zero")

Hi Arnd,

commit 8ab2ae655bf ("default exported asm symbols to zero") results
in the following build error when building alpha:allmodconfig.

arch/alpha/lib/callback_srm.S: Assembler messages:
arch/alpha/lib/callback_srm.S:97: Warning:
	Tried to .set unrecognized mode `__crc_callback_getenv'
arch/alpha/lib/callback_srm.S:97: Error:
	junk at end of line, first unrecognized character is `,'
arch/alpha/lib/callback_srm.S:98: Warning:
	Tried to .set unrecognized mode `__crc_callback_setenv'
arch/alpha/lib/callback_srm.S:98: Error:
	junk at end of line, first unrecognized character is `,'
arch/alpha/lib/callback_srm.S:99: Warning:
	Tried to .set unrecognized mode `__crc_callback_save_env'
arch/alpha/lib/callback_srm.S:99: Error:
	junk at end of line, first unrecognized character is `,'

I tried with the 4.6.3 toolchain from kernel.org (binutils 2.22)
and with a self-built toolchain based on gcc 5.1.0 and binutils 2.24.

Guenter