arm64: fix COMPAT_SHMLBA definition for large pages

ARM glibc uses (4 * __getpagesize()) for SHMLBA, which is correct for
4KB pages and works fine for 64KB pages, but the kernel uses a hardcoded
16KB that is too small for 64KB page based kernels. This changes the
definition to what user space sees when using 64KB pages.

Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Yury Norov <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

diff --git a/arch/arm64/include/asm/shmparam.h b/arch/arm64/include/asm/shmparam.h
index 4df608a8459e27c657055edd5ca519b34e755b80..e368a55ebd22d0c3dab4a690afdd33d62c76ef73 100644 (file)
--- a/arch/arm64/include/asm/shmparam.h
+++ b/arch/arm64/include/asm/shmparam.h
@@ -21,7 +21,7 @@
  * alignment value. Since we don't have aliasing D-caches, the rest of
  * the time we can safely use PAGE_SIZE.
  */
-#define COMPAT_SHMLBA  0x4000
+#define COMPAT_SHMLBA  (4 * PAGE_SIZE)
 
 #include <asm-generic/shmparam.h>