Re: [linux-next:master 7952/12404] arch/arm64/kvm/handle_exit.c:318:4: error: implicit declaration of function 'bug_get_file_line'

[Marc Zyngier <maz@kernel.org>]

On Wed, 14 Apr 2021 17:47:56 +0100,
Marc Zyngier <maz@kernel.org> wrote:
> 
> On Wed, 14 Apr 2021 05:39:56 +0100,
> kernel test robot <lkp@intel.com> wrote:
> > 
> > Hi Andrew,
> > 
> > FYI, the error/warning still remains.
> > 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > head:   dcf1b51d6b2ac5da234ae6883ed0e9422c339588
> > commit: aec0fae62e47050019474936248a311a0ab08705 [7952/12404] KVM: arm64: Log source when panicking from nVHE hyp
> > config: arm64-randconfig-r004-20210413 (attached as .config)
> > compiler: aarch64-linux-gcc (GCC) 9.3.0
> > reproduce (this is a W=1 build):
> >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >         chmod +x ~/bin/make.cross
> >         # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=aec0fae62e47050019474936248a311a0ab08705
> >         git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> >         git fetch --no-tags linux-next master
> >         git checkout aec0fae62e47050019474936248a311a0ab08705
> >         # save the attached .config to linux build tree
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> 
> [...]
> 
> > vim +/bug_get_file_line +318 arch/arm64/kvm/handle_exit.c
> > 
> >    294	
> >    295	void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr, u64 elr,
> >    296						      u64 par, uintptr_t vcpu,
> >    297						      u64 far, u64 hpfar) {
> >    298		u64 elr_in_kimg = __phys_to_kimg(__hyp_pa(elr));
> >    299		u64 hyp_offset = elr_in_kimg - kaslr_offset() - elr;
> >    300		u64 mode = spsr & PSR_MODE_MASK;
> >    301	
> >    302		/*
> >    303		 * The nVHE hyp symbols are not included by kallsyms to avoid issues
> >    304		 * with aliasing. That means that the symbols cannot be printed with the
> >    305		 * "%pS" format specifier, so fall back to the vmlinux address if
> >    306		 * there's no better option.
> >    307		 */
> >    308		if (mode != PSR_MODE_EL2t && mode != PSR_MODE_EL2h) {
> >    309			kvm_err("Invalid host exception to nVHE hyp!\n");
> >    310		} else if (ESR_ELx_EC(esr) == ESR_ELx_EC_BRK64 &&
> >    311			   (esr & ESR_ELx_BRK64_ISS_COMMENT_MASK) == BUG_BRK_IMM) {
> >    312			struct bug_entry *bug = find_bug(elr_in_kimg);
> >    313			const char *file = NULL;
> >    314			unsigned int line = 0;
> >    315	
> >    316			/* All hyp bugs, including warnings, are treated as fatal. */
> >    317			if (bug)
> >  > 318				bug_get_file_line(bug, &file, &line);
> 
> Andrew,
> 
> This is what I plan to stick on top of your series. Let me know if
> you're OK with it.

Duh. And now for the real patch and not the dummy thing that was in my
sandbox...

	M.

From 882ff4062169d5914ad7ed88c9138a90e485c05e Mon Sep 17 00:00:00 2001
From: Marc Zyngier <maz@kernel.org>
Date: Wed, 14 Apr 2021 17:41:14 +0100
Subject: [PATCH] bug: Provide dummy version of bug_get_file_line() when
 !GENERIC_BUG

Provide the missing dummy bug_get_file_line() implementation when
GENENERIC_BUG isn't selected.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 26dbc7e299c7 ("bug: Factor out a getter for a bug's file line")
Cc: Andrew Scull <ascull@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 include/linux/bug.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/bug.h b/include/linux/bug.h
index e3841bee4c8d..d889ee043118 100644
--- a/include/linux/bug.h
+++ b/include/linux/bug.h
@@ -61,6 +61,12 @@ static inline enum bug_trap_type report_bug(unsigned long bug_addr,
 	return BUG_TRAP_TYPE_BUG;
 }
 
+struct bug_entry;
+static inline void bug_get_file_line(struct bug_entry *bug, const char **file,
+				     unsigned int *line)
+{
+	*file = NULL;
+}
 
 static inline void generic_bug_clear_once(void) {}
 
-- 
2.30.2


-- 
Without deviation from the norm, progress is not possible.