ARM: fix nommu builds with 48be69a02 (ARM: move signal handlers into a vdso-like...

commit 8c0cc8a5d90bc7373a7a9e7f7a40eb41f51e03fc upstream.

Olof reports that noMMU builds error out with:

arch/arm/kernel/signal.c: In function 'setup_return':
arch/arm/kernel/signal.c:413:25: error: 'mm_context_t' has no member named 'sigpage'

This shows one of the evilnesses of IS_ENABLED().  Get rid of it here
and replace it with #ifdef's - and as no noMMU platform can make use
of sigpage, depend on CONIFG_MMU not CONFIG_ARM_MPU.

Reported-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm/include/asm/elf.h b/arch/arm/include/asm/elf.h
index 9c9b30717fdaf06bbe3d93a4dbfb63c9197aca12..56211f2084ef871841215a0c4adfec6f778689d3 100644 (file)
--- a/arch/arm/include/asm/elf.h
+++ b/arch/arm/include/asm/elf.h
@@ -130,8 +130,10 @@ struct mm_struct;
 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 #define arch_randomize_brk arch_randomize_brk
 
+#ifdef CONFIG_MMU
 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 struct linux_binprm;
 int arch_setup_additional_pages(struct linux_binprm *, int);
+#endif
 
 #endif

diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 8fedf05b06dc5f9a63096704759d3118cf7f82a1..5a42c12767af0cce01c38bd54ca17ffd98df5d1b 100644 (file)
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -398,6 +398,7 @@ setup_return(struct pt_regs *regs, struct ksignal *ksig,
                    __put_user(sigreturn_codes[idx+1], rc+1))
                        return 1;
 
+#ifdef CONFIG_MMU
                if (cpsr & MODE32_BIT) {
                        struct mm_struct *mm = current->mm;
                        /*
@@ -407,7 +408,9 @@ setup_return(struct pt_regs *regs, struct ksignal *ksig,
                         */
                        retcode = mm->context.sigpage + signal_return_offset +
                                  (idx << 2) + thumb;
-               } else {
+               } else
+#endif
+               {
                        /*
                         * Ensure that the instruction cache sees
                         * the return code written onto the stack.