UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

m68k: Fix asm register constraints for atomic ops 

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.  However, it
can be an immediate value.  Fix this by adjusting the register
constraint from "g" (general purpose register) to "di" (data register or
immediate).

Fixes: e39d88ea3c ("locking/atomic, arch/m68k: Implement atomic_fetch_{add,sub,and,or,xor}()")
Fixes: d839bae426 ("locking,arch,m68k: Fold atomic_ops")
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
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>
Tested-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210809112903.3898660-1-geert@linux-m68k.org
This commit is contained in:
Geert Uytterhoeven 2021-08-09 13:29:03 +02:00
parent 2189e928b6
commit 87d93029fe
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/m68k/include/asm/atomic.h
View File

@ -48,7 +48,7 @@ static inline int arch_atomic_##op##_return(int i, atomic_t *v) \
" casl %2,%1,%0\n" \
" jne 1b" \
: "+m" (*v), "=&d" (t), "=&d" (tmp) \
: "g" (i), "2" (arch_atomic_read(v))); \
: "di" (i), "2" (arch_atomic_read(v))); \
return t; \
}
@ -63,7 +63,7 @@ static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \
" casl %2,%1,%0\n" \
" jne 1b" \
: "+m" (*v), "=&d" (t), "=&d" (tmp) \
: "g" (i), "2" (arch_atomic_read(v))); \
: "di" (i), "2" (arch_atomic_read(v))); \
return tmp; \
}