diff options
| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2019-08-21 15:21:55 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-11-18 22:27:51 +1100 |
| commit | 46ddcb3950a28c0df4815e8dbb8d4b91d5d9f22d (patch) | |
| tree | 3bc0f24c22f19196f817336e1eacc8d2dc997ab9 /arch/powerpc/mm/fault.c | |
| parent | powerpc/mm: drop #ifdef CONFIG_MMU in is_ioremap_addr() (diff) | |
| download | linux-dev-46ddcb3950a28c0df4815e8dbb8d4b91d5d9f22d.tar.xz linux-dev-46ddcb3950a28c0df4815e8dbb8d4b91d5d9f22d.zip | |
powerpc/mm: Show if a bad page fault on data is read or write.
DSISR (or ESR on some CPUs) has a bit to tell if the fault is due to a
read or a write.
Display it.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Santosh Sivaraj <santosh@fossix.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4f88d7e6fda53b5f80a71040ab400242f6c8cb93.1566400889.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/mm/fault.c')
| -rw-r--r-- | arch/powerpc/mm/fault.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index 8432c281de92..b5047f9b5dec 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -645,6 +645,7 @@ NOKPROBE_SYMBOL(do_page_fault); void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig) { const struct exception_table_entry *entry; + int is_write = page_fault_is_write(regs->dsisr); /* Are we prepared to handle this fault? */ if ((entry = search_exception_tables(regs->nip)) != NULL) { @@ -658,9 +659,10 @@ void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig) case 0x300: case 0x380: case 0xe00: - pr_alert("BUG: %s at 0x%08lx\n", + pr_alert("BUG: %s on %s at 0x%08lx\n", regs->dar < PAGE_SIZE ? "Kernel NULL pointer dereference" : - "Unable to handle kernel data access", regs->dar); + "Unable to handle kernel data access", + is_write ? "write" : "read", regs->dar); break; case 0x400: case 0x480: |