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ARM: 9130/1: mm: Provide die_kernel_fault() helper 

Provide die_kernel_fault() helper to do the kernel fault reporting,
which with msg argument, it could report different message in different
scenes, and the later patch "ARM: mm: Fix PXN process with LPAE feature"
will use it.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Wang Kefeng 2021-09-22 14:56:31 +01:00 committed by Russell King (Oracle)
parent 93d2043844
commit 2e707106fa
1 changed files with 21 additions and 9 deletions
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30
arch/arm/mm/fault.c
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@ -99,6 +99,21 @@ void show_pte(const char *lvl, struct mm_struct *mm, unsigned long addr)
{ } { }
#endif /* CONFIG_MMU */ #endif /* CONFIG_MMU */
static void die_kernel_fault(const char *msg, struct mm_struct *mm,
unsigned long addr, unsigned int fsr,
struct pt_regs *regs)
{
bust_spinlocks(1);
pr_alert("8<--- cut here ---\n");
pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
msg, addr);
show_pte(KERN_ALERT, mm, addr);
die("Oops", regs, fsr);
bust_spinlocks(0);
do_exit(SIGKILL);
}
/* /*
* Oops. The kernel tried to access some page that wasn't present. * Oops. The kernel tried to access some page that wasn't present.
*/ */
@ -106,6 +121,7 @@ static void
__do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr, __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
struct pt_regs *regs) struct pt_regs *regs)
{ {
const char *msg;
/* /*
* Are we prepared to handle this kernel fault? * Are we prepared to handle this kernel fault?
*/ */
@ -115,16 +131,12 @@ __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
/* /*
* No handler, we'll have to terminate things with extreme prejudice. * No handler, we'll have to terminate things with extreme prejudice.
*/ */
bust_spinlocks(1); if (addr < PAGE_SIZE)
pr_alert("8<--- cut here ---\n"); msg = "NULL pointer dereference";
pr_alert("Unable to handle kernel %s at virtual address %08lx\n", else
(addr < PAGE_SIZE) ? "NULL pointer dereference" : msg = "paging request";
"paging request", addr);
show_pte(KERN_ALERT, mm, addr); die_kernel_fault(msg, mm, addr, fsr, regs);
die("Oops", regs, fsr);
bust_spinlocks(0);
do_exit(SIGKILL);
} }
/* /*