linux-kernel - [PATCH v7 09/25] lib: vdso: Add compat support

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Message-Id: <20190621095252.32307-10-vincenzo.frascino@arm.com>
Date:   Fri, 21 Jun 2019 10:52:36 +0100
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mark Salyzyn <salyzyn@...roid.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Huw Davies <huw@...eweavers.com>,
        Shijith Thotton <sthotton@...vell.com>,
        Andre Przywara <andre.przywara@....com>
Subject: [PATCH v7 09/25] lib: vdso: Add compat support

Some 64 bit architectures have support for 32 bit applications that
require a separate version of the vDSOs.

Add support to the generic code for compat fallback functions.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
Tested-by: Shijith Thotton <sthotton@...vell.com>
Tested-by: Andre Przywara <andre.przywara@....com>
---
 lib/vdso/gettimeofday.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c
index 473e2dda0220..fc43f457ed2c 100644
--- a/lib/vdso/gettimeofday.c
+++ b/lib/vdso/gettimeofday.c
@@ -21,7 +21,11 @@
  * - clock_gettime_fallback(): fallback for clock_gettime.
  * - clock_getres_fallback(): fallback for clock_getres.
  */
+#ifdef ENABLE_COMPAT_VDSO
+#include <asm/vdso/compat_gettimeofday.h>
+#else
 #include <asm/vdso/gettimeofday.h>
+#endif /* ENABLE_COMPAT_VDSO */
 
 static int do_hres(const struct vdso_data *vd,
 		   clockid_t clk,
-- 
2.21.0