This is a note to let you know that I've just added the patch titled
m68k: Fix asm register constraints for atomic ops
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
m68k-fix-asm-register-constraints-for-atomic-ops.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 669898f15dd47a980edbcc10edd2d19999b58120
Author: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Date: Mon Aug 9 13:29:03 2021 +0200
m68k: Fix asm register constraints for atomic ops
[ Upstream commit 87d93029fe83e326d5b906e12e95600b157d2c0d ]
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: e39d88ea3ce4a471 ("locking/atomic, arch/m68k: Implement atomic_fetch_{add,sub,and,or,xor}()")
Fixes: d839bae4269aea46 ("locking,arch,m68k: Fold atomic_ops")
Fixes: 1da177e4c3f41524 ("Linux-2.6.12-rc2")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
Reported-by: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Tested-by: Arnd Bergmann <arnd@xxxxxxxx>
Link: https://lore.kernel.org/r/20210809112903.3898660-1-geert@xxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/m68k/include/asm/atomic.h b/arch/m68k/include/asm/atomic.h
index 8637bf8a2f65..cfba83d230fd 100644
--- a/arch/m68k/include/asm/atomic.h
+++ b/arch/m68k/include/asm/atomic.h
@@ -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; \
}
