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SubjectRe: [PATCH] m68k: Fix asm register constraints for atomic ops
On Sun, Jul 25, 2021 at 12:46 PM Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
>
> Depending on register assignment by the compiler:
>
> {standard input}:3084: Error: operands mismatch -- statement `andl %a1,%d1' ignored
> {standard input}:3145: Error: operands mismatch -- statement `orl %a1,%d1' ignored
> {standard input}:3195: Error: operands mismatch -- statement `eorl %a1,%d1' ignored
>
> Indeed, the first operand must not be an address register. Fix this by
> adjusting the register constraint from "g" (general purpose register) to
> "d" (data register).
>
> Fixes: e39d88ea3ce4a471 ("locking/atomic, arch/m68k: Implement atomic_fetch_{add,sub,and,or,xor}()")
> Fixes: d839bae4269aea46 ("locking,arch,m68k: Fold atomic_ops")
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Arnd Bergmann <arnd@arndb.de>
> Reported-by: Alexander Viro <viro@zeniv.linux.org.uk>
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
> ---
> Personally, I have never seen this failure in an 68020+ build, but I can
> reproduce it on Coldfire with the config provided by lkp (with bogus
> CONFIG_RMW_INSNS=y).

This fixed the problem for me in the 68020 build with all compiler versions.

Tested-by: Arnd Bergmann <arnd@arndb.de>

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