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allow stripping of generated symbols under CONFIG_KALLSYMS_ALL

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Building upon parts of the module stripping patch, this patch
introduces similar stripping for vmlinux when CONFIG_KALLSYMS_ALL=y.
Using CONFIG_KALLSYMS_STRIP_GENERATED reduces the overhead of
CONFIG_KALLSYMS_ALL from 245k/310k to 65k/80k for the (i386/x86-64)
kernels I tested with.

The patch also does away with the need to special case the kallsyms-
internal symbols by making them available even in the first linking
stage.

While it is a generated file, the patch includes the changes to
scripts/genksyms/keywords.c_shipped, as I'm unsure what the procedure
here is.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Jan Beulich
2008-12-16 11:30:08 +00:00
committed by Sam Ravnborg
parent ad7a953c52
commit 9bb482476c
7 changed files with 176 additions and 149 deletions
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16
kernel/kallsyms.c
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@@ -30,20 +30,19 @@
#define all_var 0
#endif
/* These will be re-linked against their real values during the second link stage */
extern const unsigned long kallsyms_addresses[] __attribute__((weak));
extern const u8 kallsyms_names[] __attribute__((weak));
extern const unsigned long kallsyms_addresses[];
extern const u8 kallsyms_names[];
/* tell the compiler that the count isn't in the small data section if the arch
* has one (eg: FRV)
*/
extern const unsigned long kallsyms_num_syms
__attribute__((weak, section(".rodata")));
__attribute__((__section__(".rodata")));
extern const u8 kallsyms_token_table[] __attribute__((weak));
extern const u16 kallsyms_token_index[] __attribute__((weak));
extern const u8 kallsyms_token_table[];
extern const u16 kallsyms_token_index[];
extern const unsigned long kallsyms_markers[] __attribute__((weak));
extern const unsigned long kallsyms_markers[];
static inline int is_kernel_inittext(unsigned long addr)
{
@@ -168,9 +167,6 @@ static unsigned long get_symbol_pos(unsigned long addr,
unsigned long symbol_start = 0, symbol_end = 0;
unsigned long i, low, high, mid;
/* This kernel should never had been booted. */
BUG_ON(!kallsyms_addresses);
/* do a binary search on the sorted kallsyms_addresses array */
low = 0;
high = kallsyms_num_syms;