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riscv/mm: Introduce a die_kernel_fault() helper function

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Like arm64, this patch adds a die_kernel_fault() helper
to ensure the same semantics for the different kernel faults.

Signed-off-by: Eric Lin <tesheng@andestech.com>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Eric Lin 2020-12-04 13:42:58 +08:00 committed by Palmer Dabbelt
parent 641e8cd2cb
commit 21733cb518
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 17 additions and 6 deletions
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23
arch/riscv/mm/fault.c
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@ -19,8 +19,23 @@
#include "../kernel/head.h"
static void die_kernel_fault(const char *msg, unsigned long addr,
struct pt_regs *regs)
{
bust_spinlocks(1);
pr_alert("Unable to handle kernel %s at virtual address " REG_FMT "\n", msg,
addr);
bust_spinlocks(0);
die(regs, "Oops");
do_exit(SIGKILL);
}
static inline void no_context(struct pt_regs *regs, unsigned long addr)
{
const char *msg;
/* Are we prepared to handle this kernel fault? */
if (fixup_exception(regs))
return;
@ -29,12 +44,8 @@ static inline void no_context(struct pt_regs *regs, unsigned long addr)
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
*/
bust_spinlocks(1);
pr_alert("Unable to handle kernel %s at virtual address " REG_FMT "\n",
(addr < PAGE_SIZE) ? "NULL pointer dereference" :
"paging request", addr);
die(regs, "Oops");
do_exit(SIGKILL);
msg = (addr < PAGE_SIZE) ? "NULL pointer dereference" : "paging request";
die_kernel_fault(msg, addr, regs);
}
static inline void mm_fault_error(struct pt_regs *regs, unsigned long addr, vm_fault_t fault)