tcg/ppc: disable atomic write check on ppc32

This fixes building for ppc64 on ppc32 (changed in 5964fca8a12c):

tcg/ppc/tcg-target.inc.c: In function 'tb_target_set_jmp_target':
include/qemu/compiler.h:86:30: error: static assertion failed: \
  "not expecting: sizeof(*(uint64_t *)jmp_addr) > ATOMIC_REG_SIZE"
	QEMU_BUILD_BUG_ON(sizeof(*ptr) > ATOMIC_REG_SIZE); \
	^
tcg/ppc/tcg-target.inc.c:1377:9: note: in expansion of macro 'atomic_set'
	atomic_set((uint64_t *)jmp_addr, pair);
	^

Suggested-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20170911204936.5020-1-f4bug@amsat.org>
[rth: Added commentary requested by pmm.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/tcg/ppc/tcg-target.inc.c b/tcg/ppc/tcg-target.inc.c
index 21d764c102b7d0ac8fbedb7c9dd477346fe03a3b..3c9355844a0f5ed3d52b685780dea6d9cf946a33 100644 (file)
--- a/tcg/ppc/tcg-target.inc.c
+++ b/tcg/ppc/tcg-target.inc.c
@@ -1374,7 +1374,9 @@ void tb_target_set_jmp_target(uintptr_t tc_ptr, uintptr_t jmp_addr,
         pair = (uint64_t)i2 << 32 | i1;
 #endif
 
-        atomic_set((uint64_t *)jmp_addr, pair);
+        /* As per the enclosing if, this is ppc64.  Avoid the _Static_assert
+           within atomic_set that would fail to build a ppc32 host.  */
+        atomic_set__nocheck((uint64_t *)jmp_addr, pair);
         flush_icache_range(jmp_addr, jmp_addr + 8);
     } else {
         intptr_t diff = addr - jmp_addr;