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Bottomley" , Helge Deller , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , "David S. Miller" , Andreas Larsson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Muchun Song , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Shuah Khan Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Charlie Jenkins X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1995; i=charlie@rivosinc.com; h=from:subject:message-id; bh=s/V5Z34t4dT0xkb/r9QmO4zmTWyR+OmvwZt8Wf5I9yo=; b=owGbwMvMwCHWx5hUnlvL8Y3xtFoSQ9oFBcsP6+L/Tm5SuNTuoL5vd1CHFePmle9+1/Le0d5Yp 3hVY8XNjlIWBjEOBlkxRRaeaw3MrXf0y46Klk2AmcPKBDKEgYtTACYikcjwz6bDSmrzHWPjp6+e zUhZGF3tGZgzRbFMebrXzej5O9YXpDH8j7Z7ceLNKc+79Xs9s7LbGbZefbF4gvgksf23zjP3/b/ +jhkA X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 Add a selftest for MAP_BELOW_HINT that maps until it runs out of space below the hint address. Signed-off-by: Charlie Jenkins --- tools/testing/selftests/mm/Makefile | 1 + tools/testing/selftests/mm/map_below_hint.c | 32 +++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile index cfad627e8d94..4e2de85267b5 100644 --- a/tools/testing/selftests/mm/Makefile +++ b/tools/testing/selftests/mm/Makefile @@ -50,6 +50,7 @@ TEST_GEN_FILES += hugepage-shm TEST_GEN_FILES += hugepage-vmemmap TEST_GEN_FILES += khugepaged TEST_GEN_FILES += madv_populate +TEST_GEN_FILES += map_below_hint TEST_GEN_FILES += map_fixed_noreplace TEST_GEN_FILES += map_hugetlb TEST_GEN_FILES += map_populate diff --git a/tools/testing/selftests/mm/map_below_hint.c b/tools/testing/selftests/mm/map_below_hint.c new file mode 100644 index 000000000000..55d6cbf90645 --- /dev/null +++ b/tools/testing/selftests/mm/map_below_hint.c @@ -0,0 +1,32 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test the MAP_BELOW_HINT mmap flag. + */ +#include +#include +#include "../kselftest.h" + +#define ADDR (1 << 20) +#define LENGTH (ADDR / 10000) + +#define MAP_BELOW_HINT 0x8000000 /* Not defined in all libc */ + +/* + * Map memory with MAP_BELOW_HINT until no memory left. Ensure that all returned + * addresses are below the hint. + */ +int main(int argc, char **argv) +{ + void *addr; + + do { + addr = mmap((void *)ADDR, LENGTH, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_BELOW_HINT, -1, 0); + } while (addr != MAP_FAILED && (unsigned long)addr <= ADDR); + + if (errno == ENOMEM) + ksft_test_result_pass("MAP_BELOW_HINT works\n"); + else + ksft_test_result_fail("mmap returned address above hint with MAP_BELOW_HINT with error: %s\n", + strerror(errno)); +}