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authorAndy Lutomirski <luto@amacapital.net>2014-05-19 18:58:33 -0400
committerH. Peter Anvin <hpa@linux.intel.com>2014-05-20 14:38:42 -0400
commita62c34bd2a8a3f159945becd57401e478818d51c (patch)
tree8721aca251b468606e52376fc811dd0c8beeaeb8 /arch/x86/vdso/vdso2c.h
parent78d683e838a60ec4ba4591cca4364cba84a9e626 (diff)
x86, mm: Improve _install_special_mapping and fix x86 vdso naming
Using arch_vma_name to give special mappings a name is awkward. x86 currently implements it by comparing the start address of the vma to the expected address of the vdso. This requires tracking the start address of special mappings and is probably buggy if a special vma is split or moved. Improve _install_special_mapping to just name the vma directly. Use it to give the x86 vvar area a name, which should make CRIU's life easier. As a side effect, the vvar area will show up in core dumps. This could be considered weird and is fixable. [hpa: I say we accept this as-is but be prepared to deal with knocking out the vvars from core dumps if this becomes a problem.] Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/276b39b6b645fb11e345457b503f17b83c2c6fd0.1400538962.git.luto@amacapital.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/vdso/vdso2c.h')
-rw-r--r--arch/x86/vdso/vdso2c.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/vdso/vdso2c.h b/arch/x86/vdso/vdso2c.h
index ed2e894e89ab..3dcc61e796e9 100644
--- a/arch/x86/vdso/vdso2c.h
+++ b/arch/x86/vdso/vdso2c.h
@@ -136,7 +136,10 @@ static int GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
136 fprintf(outfile, "const struct vdso_image %s = {\n", name); 136 fprintf(outfile, "const struct vdso_image %s = {\n", name);
137 fprintf(outfile, "\t.data = raw_data,\n"); 137 fprintf(outfile, "\t.data = raw_data,\n");
138 fprintf(outfile, "\t.size = %lu,\n", data_size); 138 fprintf(outfile, "\t.size = %lu,\n", data_size);
139 fprintf(outfile, "\t.pages = pages,\n"); 139 fprintf(outfile, "\t.text_mapping = {\n");
140 fprintf(outfile, "\t\t.name = \"[vdso]\",\n");
141 fprintf(outfile, "\t\t.pages = pages,\n");
142 fprintf(outfile, "\t},\n");
140 if (alt_sec) { 143 if (alt_sec) {
141 fprintf(outfile, "\t.alt = %lu,\n", 144 fprintf(outfile, "\t.alt = %lu,\n",
142 (unsigned long)alt_sec->sh_offset); 145 (unsigned long)alt_sec->sh_offset);