ARM: alignment: save last kernel aligned fault location (1e7e3211) · Commits · 戴 / test

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>

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:

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