linux-kernel - [PATCH] h8300: fix PREEMPTION build, TI_PRE

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Date:   Thu, 11 Feb 2021 18:16:50 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        uclinux-h8-devel@...ts.sourceforge.jp,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] h8300: fix PREEMPTION build, TI_PRE_COUNT undefined

Fix a build error for undefined 'TI_PRE_COUNT' by adding it to
asm-offsets.c.

h8300-linux-ld: arch/h8300/kernel/entry.o: in function `resume_kernel':
(.text+0x29a): undefined reference to `TI_PRE_COUNT'

Fixes: df2078b8daa7 ("h8300: Low level entry")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: kernel test robot <lkp@...el.com>
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc: uclinux-h8-devel@...ts.sourceforge.jp
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
---
Possibly due to some Kconfig changes related to PREEMPTION?
I suppose that CONFIG_PREEMPTION hasn't been used much on H8/300.

 arch/h8300/kernel/asm-offsets.c |    3 +++
 1 file changed, 3 insertions(+)

--- lnx-511-rc7.orig/arch/h8300/kernel/asm-offsets.c
+++ lnx-511-rc7/arch/h8300/kernel/asm-offsets.c
@@ -63,6 +63,9 @@ int main(void)
 	OFFSET(TI_FLAGS, thread_info, flags);
 	OFFSET(TI_CPU, thread_info, cpu);
 	OFFSET(TI_PRE, thread_info, preempt_count);
+#ifdef CONFIG_PREEMPTION
+	DEFINE(TI_PRE_COUNT, offsetof(struct thread_info, preempt_count));
+#endif
 
 	return 0;
 }