locking/atomic, x86: Use s64 for atomic64

As a step towards making the atomic64 API use consistent types treewide,
let's have the x86 atomic64 implementation use s64 as the underlying
type for atomic64_t, rather than long or long long, matching the
generated headers.

Note that the x86 arch_atomic64 implementation is already wrapped by the
generic instrumented atomic64 implementation, which uses s64
consistently.

Otherwise, there should be no functional change as a result of this
patch.

Signed-off-by: Mark Rutland <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Russell King <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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