Merge tag 'asm-generic-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd...

[linux-2.6-block.git] / include / uapi / asm-generic / bitsperlong.h

diff --git a/include/uapi/asm-generic/bitsperlong.h b/include/uapi/asm-generic/bitsperlong.h
index 693d9a40eb7b029c12282527636372e936693204..352cb81947b87697960486e4af4e48313e891d3d 100644 (file)
--- a/include/uapi/asm-generic/bitsperlong.h
+++ b/include/uapi/asm-generic/bitsperlong.h
@@ -2,6 +2,17 @@
 #ifndef _UAPI__ASM_GENERIC_BITS_PER_LONG
 #define _UAPI__ASM_GENERIC_BITS_PER_LONG
 
+#ifndef __BITS_PER_LONG
+/*
+ * In order to keep safe and avoid regression, only unify uapi
+ * bitsperlong.h for some archs which are using newer toolchains
+ * that have the definitions of __CHAR_BIT__ and __SIZEOF_LONG__.
+ * See the following link for more info:
+ * https://lore.kernel.org/linux-arch/b9624545-2c80-49a1-ac3c-39264a591f7b@app.fastmail.com/
+ */
+#if defined(__CHAR_BIT__) && defined(__SIZEOF_LONG__)
+#define __BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
+#else
 /*
  * There seems to be no way of detecting this automatically from user
  * space, so 64 bit architectures should override this in their
@@ -9,8 +20,8 @@
  * both 32 and 64 bit user space must not rely on CONFIG_64BIT
  * to decide it, but rather check a compiler provided macro.
  */
-#ifndef __BITS_PER_LONG
 #define __BITS_PER_LONG 32
 #endif
+#endif
 
 #endif /* _UAPI__ASM_GENERIC_BITS_PER_LONG */