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a=ed25519-sha256; t=1774116351; l=2829; i=shivamkalra98@zohomail.in; s=20260212; h=from:subject:message-id; bh=CtQwnpMQocxytVG/1g8li/Ip2q6UVo/IWXgqeQX4pgY=; b=2kxGypkdmPFqpovzEYndnxajXkv892H1Ygv2DTuJh3mpZUYOsFS0e2md3H5567P88Hlk1ecoQ DKohaljaoF7BQHlLow50Jup+4M+3hcKIzHBhcn+6/9Nh2ApcvG3RTF6 X-Developer-Key: i=shivamkalra98@zohomail.in; a=ed25519; pk=9Q+S1LD/xjbjL7bEaLIlwRADBwU/6LJq7lYm8LFrkQE= X-Endpoint-Received: by B4 Relay for shivamkalra98@zohomail.in/20260212 with auth_id=633 X-Original-From: Shivam Kalra Reply-To: shivamkalra98@zohomail.in X-Stat-Signature: rcemoehtmu1rtcx9eus4ted31s5375fp X-Rspamd-Server: rspam09 X-Rspam-User: X-Rspamd-Queue-Id: 04AC7100005 X-HE-Tag: 1774116356-40334 X-HE-Meta: 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 PzA/TA0O qJhY+i3fkoIMba9SvoTsvCXnqPbaMG8IJDIvIiwTXXiUbWbQPlgeABl/WERA1Rx26/+lMhppMHax/Af3H5z8oD/IlrhGezGNLKdlX0y95HM6M4lsUj/n6efVZE+RjAFzA/teA/urWnx+vPIGWWn0Ihbu+fkcmo0TZIBYCv5a1dR7Zdmhkzu9pI9to3BQ3j1sPfTF6ntuiVidFISBWIdzBjsnQ+AVjBrcfMNFpIMmnMdBSXSG3DKVjVNNm7p5hDwsDwETHLvR+MH2J8IEmG+CefHWcl3oYqSsvsjeq4DEEMNHKcxsFZEqgtnhnYeBiUFEVpfJ+BubkHefQ/D8S/xKsRc3G9XdPUdjDASSC5+YkhEAfQxquOjtT8j6V9hHqZ3JRcpb7fRPSHmMhai+UDPiFHtYUPpvWpsENEYrY Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Shivam Kalra 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). Signed-off-by: Shivam Kalra --- lib/test_vmalloc.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c index 876c72c18a0c..e822830f0887 100644 --- a/lib/test_vmalloc.c +++ b/lib/test_vmalloc.c @@ -55,6 +55,7 @@ __param(int, run_test_mask, 7, "\t\tid: 512, name: kvfree_rcu_2_arg_vmalloc_test\n" "\t\tid: 1024, name: vm_map_ram_test\n" "\t\tid: 2048, name: no_block_alloc_test\n" + "\t\tid: 4096, name: vrealloc_test\n" /* Add a new test case description here. */ ); @@ -421,6 +422,66 @@ vm_map_ram_test(void) return nr_allocated != map_nr_pages; } +static int vrealloc_test(void) +{ + void *ptr, *tmp; + int i; + + for (i = 0; i < test_loop_count; i++) { + int err = -1; + + ptr = vmalloc(PAGE_SIZE); + if (!ptr) + return -1; + + *((__u8 *)ptr) = 'a'; + + /* Grow: beyond allocated pages, triggers full realloc. */ + tmp = vrealloc(ptr, 4 * PAGE_SIZE, GFP_KERNEL); + if (!tmp) + goto error; + ptr = tmp; + + if (*((__u8 *)ptr) != 'a') + goto error; + + /* Shrink: crosses page boundary, frees tail pages. */ + tmp = vrealloc(ptr, PAGE_SIZE, GFP_KERNEL); + if (!tmp) + goto error; + ptr = tmp; + + if (*((__u8 *)ptr) != 'a') + goto error; + + /* Shrink: within same page, no page freeing. */ + tmp = vrealloc(ptr, PAGE_SIZE / 2, GFP_KERNEL); + if (!tmp) + goto error; + ptr = tmp; + + if (*((__u8 *)ptr) != 'a') + goto error; + + /* Grow: within allocated page, in-place, no realloc. */ + tmp = vrealloc(ptr, PAGE_SIZE, GFP_KERNEL); + if (!tmp) + goto error; + ptr = tmp; + + if (*((__u8 *)ptr) != 'a') + goto error; + + err = 0; +error: + vfree(ptr); + if (err) + return err; + } + + return 0; +} + struct test_case_desc { const char *test_name; int (*test_func)(void); @@ -440,6 +501,7 @@ static struct test_case_desc test_case_array[] = { { "kvfree_rcu_2_arg_vmalloc_test", kvfree_rcu_2_arg_vmalloc_test, }, { "vm_map_ram_test", vm_map_ram_test, }, { "no_block_alloc_test", no_block_alloc_test, true }, + { "vrealloc_test", vrealloc_test, }, /* Add a new test case here. */ }; -- 2.43.0