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Commit b93d51dc authored by Ian Campbell's avatar Ian Campbell Committed by Ingo Molnar
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x86, xen: record and display initiator of each multicall when debugging 



Store the caller for each multicall so we can report it on failure.

Signed-off-by: default avatarIan Campbell <ian.campbell@citrix.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 9033304a

arch/x86/xen/multicalls.c

+7 −2
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ struct mc_buffer { 
	struct multicall_entry entries[MC_BATCH];

#if MC_DEBUG

	struct multicall_entry debug[MC_BATCH];

	void *caller[MC_BATCH];

#endif

	unsigned char args[MC_ARGS];

	struct callback {
@@ -154,11 +155,12 @@ void xen_mc_flush(void) 
			       ret, smp_processor_id());

			dump_stack();

			for (i = 0; i < b->mcidx; i++) {

				printk(KERN_DEBUG "  call %2d/%d: op=%lu arg=[%lx] result=%ld\n",

				printk(KERN_DEBUG "  call %2d/%d: op=%lu arg=[%lx] result=%ld\t%pF\n",

				       i+1, b->mcidx,

				       b->debug[i].op,

				       b->debug[i].args[0],

				       b->entries[i].result);

				       b->entries[i].result,

				       b->caller[i]);

			}

		}

#endif
@@ -197,6 +199,9 @@ struct multicall_space __xen_mc_entry(size_t args) 
	}



	ret.mc = &b->entries[b->mcidx];

#ifdef MC_DEBUG

	b->caller[b->mcidx] = __builtin_return_address(0);

#endif

	b->mcidx++;

	ret.args = &b->args[argidx];

	b->argidx = argidx + args;