linux-kernel - [PATCH 3.16 25/63] arm64: fix COMPAT

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Message-ID: <lsq.1578512578.257521352@decadent.org.uk>
Date:   Wed, 08 Jan 2020 19:43:23 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Will Deacon" <will.deacon@....com>,
        "Yury Norov" <ynorov@...iumnetworks.com>,
        "Arnd Bergmann" <arnd@...db.de>
Subject: [PATCH 3.16 25/63] arm64: fix COMPAT_SHMLBA definition for large
 pages

3.16.81-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Yury Norov <ynorov@...iumnetworks.com>

commit b9b7aebb42d1b1392f3111de61136bb6cf3aae3f upstream.

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 <arnd@...db.de>
Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
Signed-off-by: Will Deacon <will.deacon@....com>
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/arm64/include/asm/shmparam.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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>