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https://github.com/torvalds/linux
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3c7a8e190b
Move __GENMASK and __GENMASK_ULL from include/ to include/uapi/ so that they can be used to define masks in userspace API headers. Compared to what is already in include/linux/bits.h, the definitions need to use the uglified versions of UL(), ULL(), BITS_PER_LONG and BITS_PER_LONG_LONG (which did not even exist), but otherwise expand to the same content. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
32 lines
1.1 KiB
C
32 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI__ASM_GENERIC_BITS_PER_LONG
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#define _UAPI__ASM_GENERIC_BITS_PER_LONG
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#ifndef __BITS_PER_LONG
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/*
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* In order to keep safe and avoid regression, only unify uapi
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* bitsperlong.h for some archs which are using newer toolchains
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* that have the definitions of __CHAR_BIT__ and __SIZEOF_LONG__.
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* See the following link for more info:
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* https://lore.kernel.org/linux-arch/b9624545-2c80-49a1-ac3c-39264a591f7b@app.fastmail.com/
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*/
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#if defined(__CHAR_BIT__) && defined(__SIZEOF_LONG__)
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#define __BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
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#else
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/*
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* There seems to be no way of detecting this automatically from user
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* space, so 64 bit architectures should override this in their
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* bitsperlong.h. In particular, an architecture that supports
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* both 32 and 64 bit user space must not rely on CONFIG_64BIT
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* to decide it, but rather check a compiler provided macro.
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*/
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#define __BITS_PER_LONG 32
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#endif
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#endif
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#ifndef __BITS_PER_LONG_LONG
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#define __BITS_PER_LONG_LONG 64
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#endif
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#endif /* _UAPI__ASM_GENERIC_BITS_PER_LONG */
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