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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Test that a hugepage-backed shared memory segment can be created, attached, read into via /dev/zero, detached and removed without errors. Signed-off-by: Pavithra --- v7 -> v8: - Move test from syscalls/shmget/shmget07.c to hugetlb/hugeshmget/hugeshmget07.c - Remove redundant #include "tst_hugepage.h" - Rename raw_fd to zero_fd - Replace TEST()/if/tst_res() block with TST_EXP_VAL() Link to v7: https://lore.kernel.org/ltp/20260919151602.1039825-1-pavrampu@linux.ibm.com/ --- runtest/hugetlb | 1 + testcases/kernel/mem/.gitignore | 1 + .../mem/hugetlb/hugeshmget/hugeshmget07.c | 69 +++++++++++++++++++ 3 files changed, 71 insertions(+) create mode 100644 testcases/kernel/mem/hugetlb/hugeshmget/hugeshmget07.c diff --git a/runtest/hugetlb b/runtest/hugetlb index 621c9718a..d090cddec 100644 --- a/runtest/hugetlb +++ b/runtest/hugetlb @@ -62,3 +62,4 @@ hugeshmget02 hugeshmget02 -i 10 hugeshmget03 hugeshmget03 -i 10 hugeshmget05 hugeshmget05 -i 10 hugeshmget06 hugeshmget06 -i 10 +hugeshmget07 hugeshmget07 -i 10 diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore index 9e706e1c8..67f9c23a5 100644 --- a/testcases/kernel/mem/.gitignore +++ b/testcases/kernel/mem/.gitignore @@ -55,6 +55,7 @@ /hugetlb/hugeshmget/hugeshmget03 /hugetlb/hugeshmget/hugeshmget05 /hugetlb/hugeshmget/hugeshmget06 +/hugetlb/hugeshmget/hugeshmget07 /ksm/ksm01 /ksm/ksm02 /ksm/ksm03 diff --git a/testcases/kernel/mem/hugetlb/hugeshmget/hugeshmget07.c b/testcases/kernel/mem/hugetlb/hugeshmget/hugeshmget07.c new file mode 100644 index 000000000..1a85b87e4 --- /dev/null +++ b/testcases/kernel/mem/hugetlb/hugeshmget/hugeshmget07.c @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation. + * Copyright (c) 2026 Pavithra + */ + +/*\ + * Test :manpage:`shmget(2)` shared memory segment with hugepages. + * + * A hugepage-backed shared memory segment is created and attached to + * the process address space. The test reads one hugepage at a time + * from ``/dev/zero`` directly into the shared memory region, + * verifying that each read delivers the full hugepage worth of data. + * The segment is then detached and removed. + * + * Requires root for :manpage:`shmget(2)` with ``SHM_HUGETLB``. + */ + +#include "tst_test.h" +#include "tst_safe_sysv_ipc.h" + +#define NR_HUGEPAGES 2 + +static int shmid = -1; +static long hpage_size; + +static void setup(void) +{ + hpage_size = tst_get_hugepage_size(); +} + +static void cleanup(void) +{ + if (shmid >= 0) + SAFE_SHMCTL(shmid, IPC_RMID, NULL); +} + +static void run_test(void) +{ + size_t i; + size_t size = hpage_size * NR_HUGEPAGES; + char *shmaddr; + int zero_fd; + + zero_fd = SAFE_OPEN("/dev/zero", O_RDONLY); + + shmid = SAFE_SHMGET(IPC_PRIVATE, size, SHM_HUGETLB | SHM_R | SHM_W); + + shmaddr = SAFE_SHMAT(shmid, 0, SHM_RND); + tst_res(TINFO, "shmaddr: %p", shmaddr); + + for (i = 0; i < size; i += hpage_size) { + TST_EXP_VAL(read(zero_fd, shmaddr + i, hpage_size), + (ssize_t)hpage_size); + } + + SAFE_CLOSE(zero_fd); + SAFE_SHMDT(shmaddr); + SAFE_SHMCTL(shmid, IPC_RMID, NULL); + shmid = -1; +} + +static struct tst_test test = { + .needs_root = 1, + .setup = setup, + .cleanup = cleanup, + .test_all = run_test, + .hugepages = {NR_HUGEPAGES, TST_NEEDS}, +}; -- 2.55.0 -- Mailing list info: https://lists.linux.it/listinfo/ltp