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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2013-06-04 15:07:03 +0400 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2013-06-07 14:39:45 +0400 |
| commit | 9f54ad6652d454b6a8e932b5307e60c9023bd974 (patch) | |
| tree | c1bb0ef6771134652eef5fe07a4023078f7c2907 /arch/arm64/include/asm/sync_bitops.h | |
| parent | f0a8d597913bba310a519a149294b835b6c8c9c5 (diff) | |
| download | linux-9f54ad6652d454b6a8e932b5307e60c9023bd974.tar.xz | |
arm64/xen: introduce asm/xen header files on arm64
asm/xen/hypercall.h, asm/xen/hypervisor.h, asm/xen/interface.h and
asm/xen/page.h are identical so to avoid code duplication we are just
including the original arm header files here.
asm/xen/events.h is slightly different, so introduce a different file
here (use xchg to implement xchg_xen_ulong and pass regs->pstate to
raw_irqs_disabled_flags).
Also introduce asm/hypervisor.h and asm/sync_bitops.h.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Diffstat (limited to 'arch/arm64/include/asm/sync_bitops.h')
| -rw-r--r-- | arch/arm64/include/asm/sync_bitops.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/sync_bitops.h b/arch/arm64/include/asm/sync_bitops.h new file mode 100644 index 000000000000..8da0bf4f7659 --- /dev/null +++ b/arch/arm64/include/asm/sync_bitops.h @@ -0,0 +1,26 @@ +#ifndef __ASM_SYNC_BITOPS_H__ +#define __ASM_SYNC_BITOPS_H__ + +#include <asm/bitops.h> +#include <asm/cmpxchg.h> + +/* sync_bitops functions are equivalent to the SMP implementation of the + * original functions, independently from CONFIG_SMP being defined. + * + * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But + * under Xen you might be communicating with a completely external entity + * who might be on another CPU (e.g. two uniprocessor guests communicating + * via event channels and grant tables). So we need a variant of the bit + * ops which are SMP safe even on a UP kernel. + */ + +#define sync_set_bit(nr, p) set_bit(nr, p) +#define sync_clear_bit(nr, p) clear_bit(nr, p) +#define sync_change_bit(nr, p) change_bit(nr, p) +#define sync_test_and_set_bit(nr, p) test_and_set_bit(nr, p) +#define sync_test_and_clear_bit(nr, p) test_and_clear_bit(nr, p) +#define sync_test_and_change_bit(nr, p) test_and_change_bit(nr, p) +#define sync_test_bit(nr, addr) test_bit(nr, addr) +#define sync_cmpxchg cmpxchg + +#endif |