ARM: fix nommu builds with 48be69a02
(ARM: move signal handlers into a vdso-like page)
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>
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@ -130,8 +130,10 @@ struct mm_struct;
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extern unsigned long arch_randomize_brk(struct mm_struct *mm);
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#define arch_randomize_brk arch_randomize_brk
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#ifdef CONFIG_MMU
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#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
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struct linux_binprm;
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int arch_setup_additional_pages(struct linux_binprm *, int);
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#endif
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#endif
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@ -402,7 +402,8 @@ setup_return(struct pt_regs *regs, struct ksignal *ksig,
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__put_user(sigreturn_codes[idx+1], rc+1))
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return 1;
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if ((cpsr & MODE32_BIT) && !IS_ENABLED(CONFIG_ARM_MPU)) {
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#ifdef CONFIG_MMU
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if (cpsr & MODE32_BIT) {
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struct mm_struct *mm = current->mm;
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/*
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@ -412,7 +413,9 @@ setup_return(struct pt_regs *regs, struct ksignal *ksig,
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*/
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retcode = mm->context.sigpage + signal_return_offset +
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(idx << 2) + thumb;
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} else {
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} else
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#endif
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{
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/*
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* Ensure that the instruction cache sees
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* the return code written onto the stack.
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