[PATCH 1/2] vdso: allow to add architecture-specific vdso data

[Sven Schnelle]

Add the possibility to add architecture specific vDSO
data to struct vdso_data. This is useful if the arch specific
user space VDSO code needs additional data during execution.
If CONFIG_ARCH_HAS_VDSO_DATA is defined, the generic code will
include asm/vdso/data.h which should contain 'struct arch_vdso_data'.
This structure will be embedded in the generic vDSO data.

Signed-off-by: Sven Schnelle <sv...@linux.ibm.com>
Reviewed-by: Heiko Carstens <h...@linux.ibm.com>
---
 arch/Kconfig            | 3 +++
 include/vdso/datapage.h | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index 8cc35dc556c7..e1017ce979e2 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -979,6 +979,9 @@ config HAVE_SPARSE_SYSCALL_NR
          entries at 4000, 5000 and 6000 locations. This option turns on syscall
          related optimizations for a given architecture.
 
+config ARCH_HAS_VDSO_DATA
+       bool
+
 source "kernel/gcov/Kconfig"
 
 source "scripts/gcc-plugins/Kconfig"
diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h
index 7955c56d6b3c..74e730238ce6 100644
--- a/include/vdso/datapage.h
+++ b/include/vdso/datapage.h
@@ -19,6 +19,10 @@
 #include <vdso/time32.h>
 #include <vdso/time64.h>
 
+#ifdef CONFIG_ARCH_HAS_VDSO_DATA
+#include <asm/vdso/data.h>
+#endif
+
 #define VDSO_BASES     (CLOCK_TAI + 1)
 #define VDSO_HRES      (BIT(CLOCK_REALTIME)            | \
                         BIT(CLOCK_MONOTONIC)           | \
@@ -97,6 +101,9 @@ struct vdso_data {
        s32                     tz_dsttime;
        u32                     hrtimer_res;
        u32                     __unused;
+#ifdef CONFIG_ARCH_HAS_VDSO_DATA
+       struct arch_vdso_data arch;
+#endif
 };
 
 /*
-- 
2.17.1