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authorJan Beulich <JBeulich@suse.com>2014-07-03 15:35:07 +0100
committerH. Peter Anvin <hpa@linux.intel.com>2014-07-10 16:06:04 -0700
commitd093601be5e97d2729614419d0d256ed3b6a56b0 (patch)
tree3893d95782be8f751f9aef7406e14d82ca832af1
parent9f88b906b4455465d60ac18b8c95904f320038d5 (diff)
downloadlinux-d093601be5e97d2729614419d0d256ed3b6a56b0.tar.gz
x86-32, vdso: Fix vDSO build error due to missing align_vdso_addr()
Relying on static functions used just once to get inlined (and subsequently have dead code paths eliminated) is wrong: Compilers are free to decide whether they do this, regardless of optimization level. With this not happening for vdso_addr() (observed with gcc 4.1.x), an unresolved reference to align_vdso_addr() causes the build to fail. [ hpa: vdso_addr() is never actually used on x86-32, as calculate_addr in map_vdso() is always false. It ought to be possible to clean this up further, but this fixes the immediate problem. ] Signed-off-by: Jan Beulich <jbeulich@suse.com> Link: http://lkml.kernel.org/r/53B5863B02000078000204D5@mail.emea.novell.com Acked-by: Andy Lutomirski <luto@amacapital.net> Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Tested-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
-rw-r--r--arch/x86/vdso/vma.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c
index e1513c47872..5a5176de8d0 100644
--- a/arch/x86/vdso/vma.c
+++ b/arch/x86/vdso/vma.c
@@ -62,6 +62,9 @@ struct linux_binprm;
Only used for the 64-bit and x32 vdsos. */
static unsigned long vdso_addr(unsigned long start, unsigned len)
{
+#ifdef CONFIG_X86_32
+ return 0;
+#else
unsigned long addr, end;
unsigned offset;
end = (start + PMD_SIZE - 1) & PMD_MASK;
@@ -83,6 +86,7 @@ static unsigned long vdso_addr(unsigned long start, unsigned len)
addr = align_vdso_addr(addr);
return addr;
+#endif
}
static int map_vdso(const struct vdso_image *image, bool calculate_addr)