Introduce a new test case "vrealloc_test" that exercises the vrealloc()
shrink and in-place grow paths:
- Grow beyond allocated pages (triggers full reallocation).
- Shrink crossing a page boundary (frees tail pages).
- Shrink within the same page (no page freeing).
- Grow within the already allocated page count (in-place).
Data integrity is validated after each realloc step by checking that the
first byte of the original allocation is preserved.
The test is gated behind run_test_mask bit 12 (id 4096).
Link: https://lore.kernel.org/20260519-vmalloc-shrink-v14-5-70b96ee3e9c9@zohomail.in
Signed-off-by: Shivam Kalra <shivamkalra98@zohomail.in>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Shivam Kalra
3c3daeafcd