PATCH 1/2 improves the doc of sign_extend32()
This should help to avoid different manual approaches to sign extension
PATCH 2/2 adds sign_extend64()
An informal example of what could follow in
arch/sh/kernel/traps_64.c after PATCH 2/2:
@@ -101,7 +102,7 @@ static int generate_and_check_address(struct pt_regs *regs,
__s64 displacement;
displacement = (opcode >> 10) & 0x3ff;
- displacement = ((displacement << 54) >> 54); /* sign extend */
+ displacement = sign_extend64(displacement, 9);
addr = (__u64)((__s64)base_address + (displacement <<
width_shift));
} else {
--
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