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authorArnd Bergmann <arnd@arndb.de>2019-04-08 23:26:15 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2019-04-11 13:36:49 +0200
commit96ca7674ea66e9f0e2cb9f75588d4d16e5abb724 (patch)
treeb3b22f6a818e2877fe1097d775ce98bdb478466d
parentc1afcaec2af6d80d057b184eb86cbb018fce6517 (diff)
s390: don't build vdso32 with clang
clang does not support 31 bit object files on s390, so skip the 32-bit vdso here, and only build it when using gcc to compile the kernel. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/Kconfig3
-rw-r--r--arch/s390/kernel/Makefile2
-rw-r--r--arch/s390/kernel/vdso.c10
3 files changed, 9 insertions, 6 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 4ac8d49e206a..566f0b460d21 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -388,6 +388,9 @@ config COMPAT
(and some other stuff like libraries and such) is needed for
executing 31 bit applications. It is safe to say "Y".
+config COMPAT_VDSO
+ def_bool COMPAT && !CC_IS_CLANG
+
config SYSVIPC_COMPAT
def_bool y if COMPAT && SYSVIPC
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 8a62c7f72e1b..1222db6d4ee9 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -86,7 +86,7 @@ obj-$(CONFIG_TRACEPOINTS) += trace.o
# vdso
obj-y += vdso64/
-obj-$(CONFIG_COMPAT) += vdso32/
+obj-$(CONFIG_COMPAT_VDSO) += vdso32/
chkbss := head64.o early_nobss.o
include $(srctree)/arch/s390/scripts/Makefile.chkbss
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index e7920a68a12e..243d8b1185bf 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -29,7 +29,7 @@
#include <asm/vdso.h>
#include <asm/facility.h>
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_VDSO
extern char vdso32_start, vdso32_end;
static void *vdso32_kbase = &vdso32_start;
static unsigned int vdso32_pages;
@@ -55,7 +55,7 @@ static vm_fault_t vdso_fault(const struct vm_special_mapping *sm,
vdso_pagelist = vdso64_pagelist;
vdso_pages = vdso64_pages;
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_VDSO
if (vma->vm_mm->context.compat_mm) {
vdso_pagelist = vdso32_pagelist;
vdso_pages = vdso32_pages;
@@ -76,7 +76,7 @@ static int vdso_mremap(const struct vm_special_mapping *sm,
unsigned long vdso_pages;
vdso_pages = vdso64_pages;
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_VDSO
if (vma->vm_mm->context.compat_mm)
vdso_pages = vdso32_pages;
#endif
@@ -223,7 +223,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
return 0;
vdso_pages = vdso64_pages;
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_VDSO
mm->context.compat_mm = is_compat_task();
if (mm->context.compat_mm)
vdso_pages = vdso32_pages;
@@ -280,7 +280,7 @@ static int __init vdso_init(void)
int i;
vdso_init_data(vdso_data);
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_VDSO
/* Calculate the size of the 32 bit vDSO */
vdso32_pages = ((&vdso32_end - &vdso32_start
+ PAGE_SIZE - 1) >> PAGE_SHIFT) + 1;