1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Data with an alignment stricter than its size.
4 *
5 * A cloned data section has to keep its sh_addralign. The kernel has plenty
6 * of data whose alignment is a correctness property rather than an
7 * optimisation -- per-CPU variables, anything touched by an aligned SSE move,
8 * cacheline-aligned locks -- and a clone that lands under-aligned faults or
9 * silently shares a cacheline it was written to avoid.
10 *
11 * The object is new in the patched build, so klp diff has to clone it rather
12 * than reference the kernel's copy.
13 */
14
15 static const char __modinfo[]
16 __attribute__((section(".modinfo"), used, aligned(1))) = "\0name=vmlinux";
17
18 #ifdef PATCHED
19 int aligned_data[2] __attribute__((aligned(64))) = { 1, 2 };
20 #endif
21
target(int x)22 int target(int x)
23 {
24 #ifdef PATCHED
25 return x + aligned_data[0];
26 #else
27 return x;
28 #endif
29 }
30