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authorAndreas Schwab <schwab@linux-m68k.org>2009-10-04 06:35:41 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-10-27 08:42:40 +0300
commit348aa3030096e61474a5537fed5bd69e70b755c0 (patch)
tree27b0f81348eacb9d3e6f987fa77e21915140969f /arch/powerpc/kernel/vdso.c
parent7de80284d60837f13ecb2347ba7bf57470309541 (diff)
downloadlinux-348aa3030096e61474a5537fed5bd69e70b755c0.tar.xz
powerpc: Align vDSO base address
The ABI specifies a 64K alignment, we need to map the vDSO accordingly Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/vdso.c')
-rw-r--r--arch/powerpc/kernel/vdso.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 94e2df3cae07..137dc22afa42 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -50,6 +50,9 @@
/* Max supported size for symbol names */
#define MAX_SYMNAME 64
+/* The alignment of the vDSO */
+#define VDSO_ALIGNMENT (1 << 16)
+
extern char vdso32_start, vdso32_end;
static void *vdso32_kbase = &vdso32_start;
static unsigned int vdso32_pages;
@@ -231,15 +234,21 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
* pick a base address for the vDSO in process space. We try to put it
* at vdso_base which is the "natural" base for it, but we might fail
* and end up putting it elsewhere.
+ * Add enough to the size so that the result can be aligned.
*/
down_write(&mm->mmap_sem);
vdso_base = get_unmapped_area(NULL, vdso_base,
- vdso_pages << PAGE_SHIFT, 0, 0);
+ (vdso_pages << PAGE_SHIFT) +
+ ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
+ 0, 0);
if (IS_ERR_VALUE(vdso_base)) {
rc = vdso_base;
goto fail_mmapsem;
}
+ /* Add required alignment. */
+ vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
+
/*
* Put vDSO base into mm struct. We need to do this before calling
* install_special_mapping or the perf counter mmap tracking code