linux-toradex.git/scripts/genksyms/genksyms.c, branch v3.0.32

genksyms: Track changes to enum constants

2011-03-17T14:13:56+00:00

Enum constants can be used as array sizes; if the enum itself does not
appear in the symbol expansion, a change in the enum constant will go
unnoticed. Example patch that changes the ABI but does not change the
checksum with current genksyms:

| enum e {
|	E1,
|	E2,
|+	E3,
|	E_MAX
| };
|
| struct s {
|	int a[E_MAX];
| }
|
| int f(struct s *s) { ... }
| EXPORT_SYMBOL(f)

Therefore, remember the value of each enum constant and
expand each occurence to  . The value is not actually
computed, but instead an expression in the form
(last explicitly assigned value) + N
is used. This avoids having to parse and semantically understand whole
of C.

Note: The changes won't take effect until the lexer and parser are
rebuilt by the next patch.

Signed-off-by: Michal Marek 
Acked-by: Sam Ravnborg

genksyms: simplify usage of find_symbol()

2011-03-17T14:13:55+00:00

Allow searching for symbols of an exact type. The lexer does this and a
subsequent patch will add one more usage.

Signed-off-by: Michal Marek 
Acked-by: Sam Ravnborg

genksyms: Add helpers for building string lists

2011-03-17T14:13:55+00:00

Signed-off-by: Michal Marek 
Acked-by: Sam Ravnborg

genksyms: Simplify printing of symbol types

2011-03-17T14:13:55+00:00

Instead of special-casing SYM_NORMAL, do not map any name to it. Also
explicitly set the single-letter name of the symbol type, which will be
needed by a further patch. The only user-visible change is one debug
printf.

Signed-off-by: Michal Marek 
Acked-by: Sam Ravnborg

genksyms: close ref_file after use

2010-02-02T13:33:55+00:00

It is the last place when the file is read, so close it.

Signed-off-by: Alexander Beregalov 
Signed-off-by: Michal Marek

Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS

2009-09-23T14:39:28+00:00

Fix up -Wmissing-prototypes in compileable userspace code, mainly under
Documentation/.

Signed-off-by: Ladinu Chandrasinghe 
Signed-off-by: Trevor Keith 
Cc: Sam Ravnborg 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Revert "kbuild: strip generated symbols from *.ko"

2009-01-14T20:38:20+00:00

This reverts commit ad7a953c522ceb496611d127e51e278bfe0ff483.

And commit: ("allow stripping of generated symbols under CONFIG_KALLSYMS_ALL")
            9bb482476c6c9d1ae033306440c51ceac93ea80c

These stripping patches has caused a set of issues:

1) People have reported compatibility issues with binutils due to
   lack of support for `--strip-unneeded-symbols' with objcopy 2.15.92.0.2
   Reported by: Wenji
2) ccache and distcc no longer works as expeced
   Reported by: Ted, Roland, + others
3) The installed modules increased a lot in size
   Reported by: Ted, Davej + others

Reported-by: Wenji Huang 
Reported-by: "Theodore Ts'o" 
Reported-by: Dave Jones 
Reported-by: Roland McGrath 
Signed-off-by: Sam Ravnborg

kbuild: strip generated symbols from *.ko

2008-12-19T21:41:15+00:00

This patch changes the way __crc_ symbols are being resolved from
using ld to do so to using the assembler, thus allowing these symbols
to be marked local (the linker creates then as global ones) and hence
allow stripping (for modules) or ignoring (for vmlinux) them. While at
this, also strip other generated symbols during module installation.

One potentially debatable point is the handling of the flags passeed
to gcc when translating the intermediate assembly file into an object:
passing $(c_flags) unchanged doesn't work as gcc passes --gdwarf2 to
gas whenever is sees any -g* option, even for -g0, and despite the
fact that the compiler would have already produced all necessary debug
info in the C->assembly translation phase. I took the approach of just
filtering out all -g* options, but an alternative to such negative
filtering might be to have a positive filter which might, in the ideal
case allow just all the -Wa,* options to pass through.

Signed-off-by: Jan Beulich 
Signed-off-by: Sam Ravnborg

genksyms: allow to ignore symbol checksum changes

2008-12-03T21:33:12+00:00

This adds an "override" keyword for use in *.symvers / *.symref files.
When a symbol is overridden, the symbol's old definition will be used for
computing checksums instead of the new one, preserving the previous
checksum.  (Genksyms will still warn about the change.)

This is meant to allow distributions to hide minor actual as well as fake
ABI changes.  (For example, when extra type information becomes available
because additional headers are included, this may change checksums even
though none of the types used have actully changed.)

This approach also allows to get rid of "#ifdef __GENKSYMS__" hacks in the
code, which are currently used in some vendor kernels to work around
checksum changes.

Signed-off-by: Andreas Gruenbacher 
Cc: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Sam Ravnborg

genksyms: track symbol checksum changes

2008-12-03T21:33:11+00:00

Sometimes it is preferable to avoid changes of exported symbol checksums
(to avoid breaking externally provided modules).  When a checksum change
occurs, it can be hard to figure out what caused this change: underlying
types may have changed, or additional type information may simply have
become available at the point where a symbol is exported.

Add a new --reference option to genksyms which allows it to report why
checksums change, based on the type information dumps it creates with the
--dump-types flag.  Genksyms will read in such a dump from a previous run,
and report which symbols have changed (and why).

The behavior can be controlled for an entire build as follows: If
KBUILD_SYMTYPES is set, genksyms uses --dump-types to produce *.symtypes
dump files.  If any *.symref files exist, those will be used as the
reference to check against.  If KBUILD_PRESERVE is set, checksum changes
will fail the build.

Signed-off-by: Andreas Gruenbacher 
Cc: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Sam Ravnborg