[Crash-utility] [PATCH 3/4] expand percpu area.

[Toshikazu Nakayama]

Current st->__per_cpu_end points at kernel's __per_cpu_end.
Since insmod require new percpu area for target module,
expand st->__per_cpu_end to include module's percpu area,

Replace from symbol_value("sym") to st->sym at display_per_cpu_info()
because they have already been initialized.

Signed-off-by: Toshikazu Nakayama <nakayama.ts at ncos.nec.co.jp>
---
 symbols.c |   33 ++++++++++++++++++++++++++++++---
 1 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/symbols.c b/symbols.c
index 0a1d170..4b4a0e3 100755
--- a/symbols.c
+++ b/symbols.c
@@ -1271,8 +1271,12 @@ store_module_symbols_v2(ulong total, int mods_installed)
 	char buf3[BUFSIZE];
 	char buf4[BUFSIZE];
 	char *strbuf, *modbuf, *modsymbuf;
-	struct syment *sp;
+	struct syment *sp, *sp2;
 	ulong first, last;
+	uint pcpu_num_used;
+	ulong pcpu_size;
+	uint block_size;
+	int *pcpu_vals;
 
 	st->mods_installed = mods_installed;
 
@@ -1621,6 +1625,29 @@ store_module_symbols_v2(ulong total, int mods_installed)
 		}
 	}
 
+	if (kt->flags & KALLSYMS_V2) {
+		/* expand percpu range for module. */
+		if (((sp = symbol_search("pcpu_num_used")) && sp->value) &&
+		    ((sp2 = symbol_search("pcpu_size")))) {
+			readmem(sp->value, KVADDR, &pcpu_num_used,
+				sizeof(pcpu_num_used), "percpu used",
+				FAULT_ON_ERROR);
+			readmem(sp2->value, KVADDR, &pcpu_size,
+				sizeof(pcpu_size), "percpu size ptr",
+				FAULT_ON_ERROR);
+			pcpu_vals = (int *)malloc(sizeof(int) * pcpu_num_used);
+			readmem(pcpu_size, KVADDR, pcpu_vals,
+				sizeof(int) * pcpu_num_used, "percpu size vals",
+				FAULT_ON_ERROR);
+			block_size = 0;
+			for (i = 0; i < pcpu_num_used; i++)
+				block_size += abs(pcpu_vals[i]);
+			free(pcpu_vals);
+			st->__per_cpu_end += block_size;
+		} else if ((sp = symbol_search("pcpu_reserved_chunk_limit")))
+			st->__per_cpu_end = sp->value;
+	}
+
 	st->flags |= MODULE_SYMS;
 
         if (symbol_query("__insmod_", NULL, NULL))
@@ -5699,8 +5726,8 @@ display_per_cpu_info(struct syment *sp)
 	char buf[BUFSIZE];
 
 	if (((kt->flags & (SMP|PER_CPU_OFF)) != (SMP|PER_CPU_OFF)) ||
-	    (sp->value < symbol_value("__per_cpu_start")) || 
-	    (sp->value >= symbol_value("__per_cpu_end")) ||
+	    (sp->value < st->__per_cpu_start) ||
+	    (sp->value >= st->__per_cpu_end) ||
 	    !((sp->type == 'd') || (sp->type == 'D') || (sp->type == 'V')))
 		return FALSE;
 
-- 
1.7.3.2.161.g3089c