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7f053812da
Depending on the architecture, building a 32-bit vDSO on a 64-bit kernel
is problematic when some system headers are included.
Minimise the amount of headers by moving needed items, such as
__{get,put}_unaligned_t, into dedicated common headers and in general
use more specific headers, similar to what was done in commit
8165b57bca ("linux/const.h: Extract common header for vDSO") and
commit 8c59ab839f ("lib/vdso: Enable common headers").
On some architectures this results in missing PAGE_SIZE, as was
described by commit 8b3843ae36 ("vdso/datapage: Quick fix - use
asm/page-def.h for ARM64"), so define this if necessary, in the same way
as done prior by commit cffaefd15a ("vdso: Use CONFIG_PAGE_SHIFT in
vdso/datapage.h").
Removing linux/time64.h leads to missing 'struct timespec64' in
x86's asm/pvclock.h. Add a forward declaration of that struct in
that file.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
16 lines
427 B
C
16 lines
427 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __VDSO_UNALIGNED_H
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#define __VDSO_UNALIGNED_H
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#define __get_unaligned_t(type, ptr) ({ \
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const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
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__pptr->x; \
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})
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#define __put_unaligned_t(type, val, ptr) do { \
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struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
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__pptr->x = (val); \
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} while (0)
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#endif /* __VDSO_UNALIGNED_H */
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