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commit fd430caf7126228cd7e208547ae83b335400e040
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Author: Jan Stancek <jstancek@redhat.com>
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Date: Mon Feb 10 21:18:05 2014 -0500
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[PATCH] misalign: misaligned length allowed on kernels >= 3.10-rc1
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Startin with 3.10-rc1, length passed in mmap() doesn't need
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to be aligned because commit af73e4d9506d3b797509f3c030e7dcd554f7d9c4
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added ALIGN() to kernel side, in mmap_pgoff(), when mapping huge
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page files.
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This patch treats successful mmap() with misaligned length on
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kernels >= 3.10 as PASS.
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See also:
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Bug 56881 - MAP_HUGETLB mmap fails for certain sizes
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https://bugzilla.kernel.org/show_bug.cgi?id=56881
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Signed-off-by: Jan Stancek <jstancek@redhat.com>
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Signed-off-by: Eric Munson <emunson@mgebm.net>
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diff --git a/tests/misalign.c b/tests/misalign.c
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index de85be6..de1bf98 100644
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--- a/tests/misalign.c
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+++ b/tests/misalign.c
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@@ -23,6 +23,7 @@
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#include <errno.h>
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#include <signal.h>
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#include <sys/mman.h>
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+#include <sys/utsname.h>
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#include <hugetlbfs.h>
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@@ -40,6 +41,11 @@
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* necessary checks for the hugepage paths. This testcase ensures
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* that attempted hugepage mappings with parameters which are not
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* correctly hugepage aligned are rejected.
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+ *
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+ * However starting with 3.10-rc1, length passed in mmap() doesn't need
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+ * to be aligned because commit af73e4d9506d3b797509f3c030e7dcd554f7d9c4
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+ * added ALIGN() to kernel side, in mmap_pgoff(), when mapping huge page
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+ * files.
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*/
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int main(int argc, char *argv[])
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{
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@@ -47,9 +53,13 @@ int main(int argc, char *argv[])
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int fd;
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void *p, *q;
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int err;
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+ struct utsname buf;
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test_init(argc, argv);
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+ if (uname(&buf) != 0)
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+ FAIL("uname failed %s", strerror(errno));
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+
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page_size = getpagesize();
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hpage_size = check_hugepagesize();
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@@ -92,16 +102,30 @@ int main(int argc, char *argv[])
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/* 3) Try a misaligned length */
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q = mmap(NULL, page_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
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- if (q != MAP_FAILED)
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- FAIL("mmap() with misaligned length 0x%lx succeeded",
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- page_size);
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+
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+ if (test_compare_kver(buf.release, "3.10.0") < 0) {
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+ if (q != MAP_FAILED)
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+ FAIL("mmap() with misaligned length 0x%lx succeeded",
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+ page_size);
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+ } else {
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+ if (q == MAP_FAILED)
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+ FAIL("mmap() with misaligned length 0x%lx failed",
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+ page_size);
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+ }
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/* 4) Try a misaligned length with MAP_FIXED */
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q = mmap(p, page_size, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_FIXED, fd, 0);
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- if (q != MAP_FAILED)
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- FAIL("mmap() MAP_FIXED with misaligned length 0x%lx succeeded",
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- page_size);
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+
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+ if (test_compare_kver(buf.release, "3.10.0") < 0) {
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+ if (q != MAP_FAILED)
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+ FAIL("mmap() MAP_FIXED with misaligned length 0x%lx "
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+ "succeeded", page_size);
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+ } else {
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+ if (q == MAP_FAILED)
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+ FAIL("mmap() MAP_FIXED with misaligned length 0x%lx "
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+ "failed", page_size);
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+ }
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/* 5) Try a misaligned offset */
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q = mmap(NULL, hpage_size, PROT_READ|PROT_WRITE,
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