arch_atomic.c:Provide __sync_synchronize when the compiler does not s…

…upport it

Summary:
  Configuration/Tool: zp214xpa/nsh,CONFIG_ARM_TOOLCHAIN_GNU_EABI
2024-09-14 06:11:00
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Disabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Enabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Building NuttX...
arm-none-eabi-ld: /github/workspace/sources/nuttx/staging/libfs.a(fs_inoderemove.o): in function `inode_remove':
fs_inoderemove.c:(.text.inode_remove+0x94): undefined reference to `__sync_synchronize'
arm-none-eabi-ld: fs_inoderemove.c:(.text.inode_remove+0x9c): undefined reference to `__sync_synchronize'
make[1]: *** [Makefile:212: nuttx] Error 1
make: *** [tools/Unix.mk:548: nuttx] Error 2
make: Target 'all' not remade because of errors.

Signed-off-by: chenrun1 <[email protected]>

libs/libc/machine/arch_atomic.c

@@ -753,17 +753,15 @@ SYNC_VAL_CMP_SWAP(4, uint32_t)
 
 SYNC_VAL_CMP_SWAP(8, uint64_t)
 
-#endif /* __clang__ */
-
-#ifdef __ghs__
-
 /****************************************************************************
  * Name: __sync_synchronize
  ****************************************************************************/
 
 void weak_function __sync_synchronize(void)
 {
-  asm volatile("" ::: "memory");
+#ifdef SP_DMB
+  SP_DMB();
+#endif
 }
 
-#endif
+#endif /* __clang__ */