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scripts/kallsyms: set relative_base more effectively

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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@socionext.com>
This commit is contained in:
Masahiro Yamada 2019-11-24 01:04:32 +09:00
parent 5e5c4fa787
commit f34ea02910
1 changed files with 8 additions and 4 deletions
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12
scripts/kallsyms.c
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@ -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();