Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 1e7e3211 authored by Russell King's avatar Russell King
Browse files

ARM: alignment: save last kernel aligned fault location 



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: default avatarTony Lindgren <tony@atomide.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 6ebbf2ce

arch/arm/mm/alignment.c

+3 −1
Original line number Diff line number Diff line
@@ -76,6 +76,7 @@ 


static unsigned long ai_user;

static unsigned long ai_sys;

static void *ai_sys_last_pc;

static unsigned long ai_skipped;

static unsigned long ai_half;

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)

{

	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, "Half:\t\t%lu\n", ai_half);

	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;



	ai_sys += 1;

	ai_sys_last_pc = (void *)instruction_pointer(regs);



 fixup: