Address of non-module kernel symbol should always be located
from CONFIG_PAGE_OFFSET on, so only show these legal kernel
symbols in /proc/kallsyms.
On ARM, some symbols(see below) may drop in relocatable code, so
perf can't parse kernel symbols any more from /proc/kallsyms, this
patch fixes the problem.
00000000 t __vectors_start
00000020 A cpu_v7_suspend_size
00001000 t __stubs_start
00001004 t vector_rst
00001020 t vector_irq
000010a0 t vector_dabt
00001120 t vector_pabt
000011a0 t vector_und
00001220 t vector_addrexcptn
00001224 t vector_fiq
00001224 T vector_fiq_offset
The issue can be fixed in scripts/kallsyms.c too, but looks this
approach is easier.
Cc: Russell King <[email protected]>
Cc: [email protected]
Cc: Rusty Russell <[email protected]>
Cc: Chen Gang <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
---
kernel/kallsyms.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 3127ad5..184f271 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -543,7 +543,7 @@ static int s_show(struct seq_file *m, void *p)
tolower(iter->type);
seq_printf(m, "%pK %c %s\t[%s]\n", (void *)iter->value,
type, iter->name, iter->module_name);
- } else
+ } else if (iter->value >= CONFIG_PAGE_OFFSET)
seq_printf(m, "%pK %c %s\n", (void *)iter->value,
iter->type, iter->name);
return 0;
--
1.7.9.5
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