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bug: Have __warn() prototype defined unconditionally 

The __warn() prototype is declared in CONFIG_BUG scope but the function
definition in panic.c is unconditional. The IBT enablement started using
it unconditionally but a CONFIG_X86_KERNEL_IBT=y, CONFIG_BUG=n .config
will trigger a

  arch/x86/kernel/traps.c: In function ‘__exc_control_protection’:
  arch/x86/kernel/traps.c:249:17: error: implicit declaration of function \
  	  ‘__warn’; did you mean ‘pr_warn’? [-Werror=implicit-function-declaration]

Pull up the declarations so that they're unconditionally visible too.

  [ bp: Rewrite commit message. ]

Fixes: 991625f3dd ("x86/ibt: Add IBT feature, MSR and #CP handling")
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Shida Zhang <zhangshida@kylinos.cn>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220426032007.510245-1-starzhangzsd@gmail.com
This commit is contained in:
Shida Zhang 2022-04-26 11:20:07 +08:00 committed by Borislav Petkov
parent 4cdfc11b28
commit 1fa568e26f
1 changed files with 6 additions and 5 deletions
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11
include/asm-generic/bug.h
View File

@ -21,6 +21,12 @@
#include <linux/panic.h>
#include <linux/printk.h>
struct warn_args;
struct pt_regs;
void __warn(const char *file, int line, void *caller, unsigned taint,
struct pt_regs *regs, struct warn_args *args);
#ifdef CONFIG_BUG
#ifdef CONFIG_GENERIC_BUG
@ -110,11 +116,6 @@ extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
#endif
/* used internally by panic.c */
struct warn_args;
struct pt_regs;
void __warn(const char *file, int line, void *caller, unsigned taint,
struct pt_regs *regs, struct warn_args *args);
#ifndef WARN_ON
#define WARN_ON(condition) ({ \