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Message-Id: <20191123160444.11251-5-yamada.masahiro@socionext.com>
Date: Sun, 24 Nov 2019 01:04:32 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: linux-kbuild@...r.kernel.org
Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 04/16] scripts/kallsyms: set relative_base more effectively
Currently, record_relative_base() iterates over the entire table to
find the minimum address, but it is not efficient because we sort
the table anyway.
After sort_symbol(), the table is sorted by address. (kallsyms parses
the 'nm -n' output, so the data is already sorted by address, but this
commit does not rely on it.)
Move record_relative_base() after sort_symbols(), and take the first
non-absolute symbol value.
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---
Changes in v2: None
scripts/kallsyms.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index de986eda41a6..c9efb67c6ecb 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -739,11 +739,15 @@ static void record_relative_base(void)
{
unsigned int i;
- relative_base = -1ULL;
for (i = 0; i < table_cnt; i++)
- if (!symbol_absolute(&table[i]) &&
- table[i].addr < relative_base)
+ if (!symbol_absolute(&table[i])) {
+ /*
+ * The table is sorted by address.
+ * Take the first non-absolute symbol value.
+ */
relative_base = table[i].addr;
+ return;
+ }
}
int main(int argc, char **argv)
@@ -767,9 +771,9 @@ int main(int argc, char **argv)
shrink_table();
if (absolute_percpu)
make_percpus_absolute();
+ sort_symbols();
if (base_relative)
record_relative_base();
- sort_symbols();
optimize_token_table();
write_src();
--
2.17.1
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