mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 03:07:29 +07:00
8a524f803a
Hans managed to trigger a WARN very early in the boot which killed his
(Virtual) box.
The reason is that the recent rework of WARN() to use UD0 forgot to add the
fixup_bug() call to early_fixup_exception(). As a result the kernel does
not handle the WARN_ON injected UD0 exception and panics.
Add the missing fixup call, so early UD's injected by WARN() get handled.
Fixes: 9a93848fe7 ("x86/debug: Implement __WARN() using UD0")
Reported-and-tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Frank Mehnert <frank.mehnert@oracle.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Michael Thayer <michael.thayer@oracle.com>
Link: http://lkml.kernel.org/r/20170612180108.w4vgu2ckucmllf3a@hirez.programming.kicks-ass.net
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
#ifndef _ASM_X86_EXTABLE_H
|
|
#define _ASM_X86_EXTABLE_H
|
|
/*
|
|
* The exception table consists of triples of addresses relative to the
|
|
* exception table entry itself. The first address is of an instruction
|
|
* that is allowed to fault, the second is the target at which the program
|
|
* should continue. The third is a handler function to deal with the fault
|
|
* caused by the instruction in the first field.
|
|
*
|
|
* All the routines below use bits of fixup code that are out of line
|
|
* with the main instruction path. This means when everything is well,
|
|
* we don't even have to jump over them. Further, they do not intrude
|
|
* on our cache or tlb entries.
|
|
*/
|
|
|
|
struct exception_table_entry {
|
|
int insn, fixup, handler;
|
|
};
|
|
struct pt_regs;
|
|
|
|
#define ARCH_HAS_RELATIVE_EXTABLE
|
|
|
|
#define swap_ex_entry_fixup(a, b, tmp, delta) \
|
|
do { \
|
|
(a)->fixup = (b)->fixup + (delta); \
|
|
(b)->fixup = (tmp).fixup - (delta); \
|
|
(a)->handler = (b)->handler + (delta); \
|
|
(b)->handler = (tmp).handler - (delta); \
|
|
} while (0)
|
|
|
|
extern int fixup_exception(struct pt_regs *regs, int trapnr);
|
|
extern int fixup_bug(struct pt_regs *regs, int trapnr);
|
|
extern bool ex_has_fault_handler(unsigned long ip);
|
|
extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
|
|
|
|
#endif
|