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ARM: alignment: save last kernel aligned fault location

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Save and report (via the procfs file) the last kernel unaligned fault
location.  This allows us to trivially inspect where the last fault
happened for cases which we don't expect to occur.

Since we expect the kernel to generate misalignment faults (due to
the networking layer), even when warnings are enabled, we don't log
them for the kernel.

Tested-by: Tony Lindgren <tony@atomide.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2014-07-04 14:32:43 +01:00
parent 6ebbf2ce43
commit 1e7e321185
1 changed files with 3 additions and 1 deletions
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4
arch/arm/mm/alignment.c
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@ -76,6 +76,7 @@
static unsigned long ai_user; static unsigned long ai_user;
static unsigned long ai_sys; static unsigned long ai_sys;
static void *ai_sys_last_pc;
static unsigned long ai_skipped; static unsigned long ai_skipped;
static unsigned long ai_half; static unsigned long ai_half;
static unsigned long ai_word; static unsigned long ai_word;
@ -130,7 +131,7 @@ static const char *usermode_action[] = {
static int alignment_proc_show(struct seq_file *m, void *v) static int alignment_proc_show(struct seq_file *m, void *v)
{ {
seq_printf(m, "User:\t\t%lu\n", ai_user); seq_printf(m, "User:\t\t%lu\n", ai_user);
seq_printf(m, "System:\t\t%lu\n", ai_sys); seq_printf(m, "System:\t\t%lu (%pF)\n", ai_sys, ai_sys_last_pc);
seq_printf(m, "Skipped:\t%lu\n", ai_skipped); seq_printf(m, "Skipped:\t%lu\n", ai_skipped);
seq_printf(m, "Half:\t\t%lu\n", ai_half); seq_printf(m, "Half:\t\t%lu\n", ai_half);
seq_printf(m, "Word:\t\t%lu\n", ai_word); seq_printf(m, "Word:\t\t%lu\n", ai_word);
@ -794,6 +795,7 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
goto user; goto user;
ai_sys += 1; ai_sys += 1;
ai_sys_last_pc = (void *)instruction_pointer(regs);
fixup: fixup: