linux-kernel - [PATCH 2/2] MIPS: make kgdb depend on FPU support

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Message-Id: <20210122110307.934543-2-arnd@kernel.org>
Date:   Fri, 22 Jan 2021 12:02:51 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Arnd Bergmann <arnd@...db.de>, kernel test robot <lkp@...el.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Paul Burton <paulburton@...nel.org>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] MIPS: make kgdb depend on FPU support

From: Arnd Bergmann <arnd@...db.de>

kgdb fails to build when the FPU support is disabled:

arch/mips/kernel/kgdb.c: In function 'dbg_set_reg':
arch/mips/kernel/kgdb.c:147:35: error: 'struct thread_struct' has no member named 'fpu'
  147 |    memcpy((void *)&current->thread.fpu.fcr31, mem,
      |                                   ^
arch/mips/kernel/kgdb.c:155:34: error: 'struct thread_struct' has no member named 'fpu'
  155 |   memcpy((void *)&current->thread.fpu.fpr[fp_reg], mem,

This is only relevant for CONFIG_EXPERT=y, so disallowing it
in Kconfig is an easier workaround than fixing it properly.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/mips/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index e6bd1eee70f2..7fea149f63cf 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -41,7 +41,7 @@ config MIPS
 	select HANDLE_DOMAIN_IRQ
 	select HAVE_ARCH_COMPILER_H
 	select HAVE_ARCH_JUMP_LABEL
-	select HAVE_ARCH_KGDB
+	select HAVE_ARCH_KGDB if MIPS_FP_SUPPORT
 	select HAVE_ARCH_MMAP_RND_BITS if MMU
 	select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT
 	select HAVE_ARCH_SECCOMP_FILTER
-- 
2.29.2