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  1. 10 10月, 2015 2 次提交
  3. 12 9月, 2015 1 次提交
  5. 11 9月, 2015 13 次提交
  7. 09 9月, 2015 1 次提交
  9. 05 9月, 2015 6 次提交
  11. 04 9月, 2015 3 次提交
  13. 28 8月, 2015 2 次提交
    • R
      scripts: add stackdelta script · 5bbb9f75
      由 Rasmus Villemoes 提交于 
      This adds a simple perl script for reading two files as produced by
the stackusage script and computing the changes in stack usage. For
example:

$ scripts/stackusage -o /tmp/old.su CC=gcc-4.7 -j8 fs/ext4/
$ scripts/stackusage -o /tmp/new.su CC=gcc-5.0 -j8 fs/ext4/
$ scripts/stackdelta /tmp/{old,new}.su | sort -k5,5g

shows that gcc 5.0 generally produces less stack-hungry code than gcc
4.7. Obviously, the script can also be used for measuring the effect
of commits, .config tweaks or whatnot.
Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NMichal Marek <mmarek@suse.com>
      5bbb9f75
    • R
      scripts: add stackusage script · 56d4a381
      由 Rasmus Villemoes 提交于 
      The current checkstack.pl script has a few problems, stemming from the
overly simplistic attempt at parsing objdump output with regular
expressions: For example, on x86_64 it doesn't take the push
instruction into account, making it consistently underestimate the
real stack use, and it also doesn't capture stack pointer adjustments
of exactly 128 bytes [1].

Since newer gcc (>= 4.6) knows about -fstack-usage, we might as well
take the information straight from the horse's mouth. This patch
introduces scripts/stackusage, which is a simple wrapper for running
make with KCFLAGS set to -fstack-usage. Example use is

scripts/stackusage -o out.su -j8 lib/

The script understands "-o foo" for writing to 'foo' and -h for a
trivial help text; anything else is passed to make.

Afterwards, we find all newly created .su files, massage them a
little, sort by stack use and write the result to a single output
file.

Note that the function names printed by (at least) gcc 4.7 are
sometimes useless. For example, the first three lines of out.su
generated above are

./lib/decompress_bunzip2.c:155  get_next_block  448     static
./lib/decompress_unlzma.c:537   unlzma  336     static
./lib/vsprintf.c:616    8       304     static

That function '8' is really the static symbol_string(), but it has
been subject to 'interprocedural scalar replacement of aggregates', so
its name in the object file is 'symbol_string.isra.8'. gcc 5.0 doesn't
have this problem; it uses the full name as seen in the object file.

[1] Since gcc encodes that by

48 83 c4 80             add    $0xffffffffffffff80,%rsp

and not

48 81 ec 80 00 00 00    sub    $0x80,%rsp

since -128 fits in an imm8.
Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NMichal Marek <mmarek@suse.com>
      56d4a381
  15. 27 8月, 2015 1 次提交
  17. 26 8月, 2015 1 次提交
  19. 24 8月, 2015 3 次提交
  21. 20 8月, 2015 5 次提交
    • M
      genksyms: Regenerate parser · 5b733fac
      由 Michal Marek 提交于 
      Rebuild the parser after commit 1c722503 (genksyms: Duplicate
function pointer type definitions segfault), using bison 2.7.
Signed-off-by: NMichal Marek <mmarek@suse.com>
      5b733fac
    • R
      genksyms: Duplicate function pointer type definitions segfault · 1c722503
      由 Richard Yao 提交于 
      I noticed that genksyms will segfault when it sees duplicate function
pointer type declaration when I placed the same function pointer
definition in two separate headers in a local branch as an intermediate
step of some refactoring. This can be reproduced by piping the following
minimal test case into `genksyms -r /dev/null` or alternatively, putting
it into a C file attempting a build:

typedef int (*f)();
typedef int (*f)();

Attaching gdb to genksyms to understand this failure is useless without
changing CFLAGS to emit debuginfo. Once you have debuginfo, you will
find that the failure is that `char *s` was NULL and the program
executed `while(*s)`. At which point, further debugging requires
familiarity with compiler front end / parser development.

What happens is that flex identifies the first instance of the token "f"
as IDENT and the yacc parser adds it to the symbol table. On the second
instance, flex will identify "f" as TYPE, which triggers an error case
in the yacc parser. Given that TYPE would have been IDENT had it not
been in the symbol table, the the segmentaion fault could be avoided by
treating TYPE as IDENT in the affected rule.

Some might consider placing identical function pointer type declarations
in different headers to be poor style might consider a failure to be
beneficial. However, failing through a segmentation fault makes the
cause non-obvious and can waste the time of anyone who encounters it.
Signed-off-by: NRichard Yao <richard.yao@clusterhq.com>
Acked-by: NMadhuri Yechuri <madhuriyechuri@clusterhq.com>
Signed-off-by: NMichal Marek <mmarek@suse.com>
      1c722503
    • P
      Avoid conflict with host definitions when cross-compiling · 3c0561e0
      由 Pavel Fedin 提交于 
      Certain platforms (e. g. BSD-based ones) define some ELF constants
according to host. This patch fixes problems with cross-building
Linux kernel on these platforms (e. g. building ARM 32-bit version
on x86-64 host).
Signed-off-by: NPavel Fedin <p.fedin@samsung.com>
Signed-off-by: NMichal Marek <mmarek@suse.com>
      3c0561e0
    • S
      merge_config.sh: exit on missing input files · 78a6854e
      由 Sam Bobroff 提交于 
      Add a check for the existence of input files and exit (with failure)
if they are missing.

Without this additional check, missing files produce error messages
but still result in an output file being generated and a successful
exit code.
Signed-off-by: NSam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: NMichal Marek <mmarek@suse.com>
      78a6854e
    • C
      fallback to hostname in scripts/package/builddeb · bea107b1
      由 Christian Kujau 提交于 
      I happened to build a kernel with "make deb-pkg" on a machine with no
network connectivity, but this failed with:

[...]
  INSTALL debian/headertmp/usr/include/asm/ (65 files)
hostname: Name or service not known
../scripts/package/Makefile:90: recipe for target 'deb-pkg' failed
make[2]: *** [deb-pkg] Error 1

In scripts/package/builddeb it tries to construct an email address (that
can be queried in /proc/version later on) but with no network,
the "hostname -f" fails. The following patch falls back to just use the
shortname if we cannot determine our FQDN.
Signed-off-by: NChristian Kujau <lists@nerdbynature.de>
Signed-off-by: NMichal Marek <mmarek@suse.cz>
      bea107b1
  23. 19 8月, 2015 2 次提交