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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: linux-mm@kvack.org, akpm@linux-foundation.org
Cc: kaleshsingh@google.com, npiggin@gmail.com,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
	joel@joelfernandes.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v4 2/9] selftest/mremap_test: Avoid crash with static build
Date: Wed, 14 Apr 2021 14:29:08 +0530
Message-ID: <20210414085915.301189-3-aneesh.kumar@linux.ibm.com> (raw)
In-Reply-To: <20210414085915.301189-1-aneesh.kumar@linux.ibm.com>

With a large mmap map size, we can overlap with the text area and using
MAP_FIXED results in unmapping that area. Switch to MAP_FIXED_NOREPLACE
and handle the EEXIST error.

Reviewed-by: Kalesh Singh <kaleshsingh@google.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 tools/testing/selftests/vm/mremap_test.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/vm/mremap_test.c b/tools/testing/selftests/vm/mremap_test.c
index c9a5461eb786..0624d1bd71b5 100644
--- a/tools/testing/selftests/vm/mremap_test.c
+++ b/tools/testing/selftests/vm/mremap_test.c
@@ -75,9 +75,10 @@ static void *get_source_mapping(struct config c)
 retry:
 	addr += c.src_alignment;
 	src_addr = mmap((void *) addr, c.region_size, PROT_READ | PROT_WRITE,
-			MAP_FIXED | MAP_ANONYMOUS | MAP_SHARED, -1, 0);
+			MAP_FIXED_NOREPLACE | MAP_ANONYMOUS | MAP_SHARED,
+			-1, 0);
 	if (src_addr == MAP_FAILED) {
-		if (errno == EPERM)
+		if (errno == EPERM || errno == EEXIST)
 			goto retry;
 		goto error;
 	}
-- 
2.30.2


  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-14  8:59 [PATCH v4 0/9] Speedup mremap on ppc64 Aneesh Kumar K.V
2021-04-14  8:59 ` [PATCH v4 1/9] selftest/mremap_test: Update the test to handle pagesize other than 4K Aneesh Kumar K.V
2021-04-14  8:59 ` Aneesh Kumar K.V [this message]
2021-04-14  8:59 ` [PATCH v4 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries Aneesh Kumar K.V
2021-04-14  8:59 ` [PATCH v4 4/9] powerpc/mm/book3s64: Fix possible build error Aneesh Kumar K.V
2021-04-20  3:43   ` Michael Ellerman
2021-04-14  8:59 ` [PATCH v4 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument Aneesh Kumar K.V
2021-04-14  8:59 ` [PATCH v4 6/9] mm/mremap: Use range flush that does TLB and page walk cache flush Aneesh Kumar K.V
2021-04-20  3:47   ` Michael Ellerman
2021-04-20  4:17     ` Aneesh Kumar K.V
2021-04-14  8:59 ` [PATCH v4 7/9] mm/mremap: Move TLB flush outside page table lock Aneesh Kumar K.V
2021-04-14  8:59 ` [PATCH v4 8/9] mm/mremap: Allow arch runtime override Aneesh Kumar K.V
2021-04-20  3:52   ` Michael Ellerman
2021-04-20  4:30     ` Aneesh Kumar K.V
2021-04-14  8:59 ` [PATCH v4 9/9] powerpc/mm: Enable move pmd/pud Aneesh Kumar K.V

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