[PATCH v2 2/4] linux/const.h: move UL() macro to include/linux/const.h
From: dhowells@redhat.com (David Howells)
Date: 2017-01-06 10:47:35
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lkml
Masahiro Yamada [off-list ref] wrote:
quoted hunk ↗ jump to hunk
diff --git a/include/uapi/linux/const.h b/include/uapi/linux/const.h index c872bfd..76fb0f9 100644 --- a/include/uapi/linux/const.h +++ b/include/uapi/linux/const.h@@ -1,7 +1,7 @@ /* const.h: Macros for dealing with constants. */ -#ifndef _LINUX_CONST_H -#define _LINUX_CONST_H +#ifndef _UAPI_LINUX_CONST_H +#define _UAPI_LINUX_CONST_H
You need to be very careful doing this. Some userspace stuff depends on the guard macro names on the kernel header files.
quoted hunk ↗ jump to hunk
/* Some constant macros are used in both assembler and * C code. Therefore we cannot annotate them always with@@ -21,7 +21,10 @@ #define _AT(T,X) ((T)(X)) #endif +#define _UL(x) (_AC(x, UL)) +#define _ULL(x) (_AC(x, ULL))
How likely is this to collide with existing userspace code somewhere? It looks like the sort of thing that could collide with a C library. David