linux-toradex.git/include/asm-generic/vmlinux.lds.h, branch tegra-10.9.1

Optimize the ordering of sections in RW_DATA_SECTION.

2009-09-25T00:16:21+00:00

The old RW_DATA_SECTION had INIT_TASK_DATA (which was
more-than-PAGE_SIZE-aligned), followed by a bunch of small alignment
stuff, followed by more PAGE_SIZE-aligned stuff, so you wasted memory
in the middle of .data re-aligning back up to PAGE_SIZE.

This patch sorts the sections by alignment requirements, which should
pack them essentially optimally.

Signed-off-by: Tim Abbott 
Reviewed-by: Sam Ravnborg 
Signed-off-by: Linus Torvalds

Merge branch 'linus' into tracing/core

2009-09-17T18:53:10+00:00

Merge reason: Pick up kernel/softirq.c update for dependent fix.

Signed-off-by: Ingo Molnar

ftrace: __start_mcount_loc should be .init.rodata

2009-09-13T01:57:29+00:00

__start_mcount_loc[] is unused after init, yet occupies RAM forever
as part of .rodata.  152kiB is typical on a 64-bit architecture.  Instead,
__start_mcount_loc should be in the interval [__init_begin, __init_end)
so that the space is reclaimed after init.

__start_mcount_loc[] is generated during the load portion
of kernel build, and is used only by ftrace_init().  ftrace_init is declared
'__init' and is in .init.text, which is freed after init.
__start_mcount_loc is placed into .rodata by a call to MCOUNT_REC inside
the RO_DATA macro of include/asm-generic/vmlinux.lds.h.  The array *is*
read-only, but more importantly it is not used after init.  So the call to
MCOUNT_REC should be moved from RO_DATA to INIT_DATA.

This patch has been tested on x86_64 with CONFIG_DEBUG_PAGEALLOC=y
which verifies that the address range never is accessed after init.

Signed-off-by: John Reiser 
LKML-Reference: <4A6DF0B6.7080402@bitwagon.com>
Signed-off-by: Steven Rostedt

Merge branch 'percpu-for-linus' into percpu-for-next

2009-08-14T05:45:31+00:00

Conflicts:
	arch/sparc/kernel/smp_64.c
	arch/x86/kernel/cpu/perf_counter.c
	arch/x86/kernel/setup_percpu.c
	drivers/cpufreq/cpufreq_ondemand.c
	mm/percpu.c

Conflicts in core and arch percpu codes are mostly from commit
ed78e1e078dd44249f88b1dd8c76dafb39567161 which substituted many
num_possible_cpus() with nr_cpu_ids.  As for-next branch has moved all
the first chunk allocators into mm/percpu.c, the changes are moved
from arch code to mm/percpu.c.

Signed-off-by: Tejun Heo

vmlinux.lds.h: restructure BSS linker script macros

2009-07-17T22:02:45+00:00

The BSS section macros in vmlinux.lds.h currently place the .sbss
input section outside the bounds of [__bss_start, __bss_end].  On all
architectures except for microblaze that handle both .sbss and
__bss_start/__bss_end, this is wrong: the .sbss input section is
within the range [__bss_start, __bss_end].  Relatedly, the example
code at the top of the file actually has __bss_start/__bss_end defined
twice; I believe the right fix here is to define them in the
BSS_SECTION macro but not in the BSS macro.

Another problem with the current macros is that several
architectures have an ALIGN(4) or some other small number just before
__bss_stop in their linker scripts.  The BSS_SECTION macro currently
hardcodes this to 4; while it should really be an argument.  It also
ignores its sbss_align argument; fix that.

mn10300 is the only user at present of any of the macros touched by
this patch.  It looks like mn10300 actually was incorrectly converted
to use the new BSS() macro (the alignment of 4 prior to conversion was
a __bss_stop alignment, but the argument to the BSS macro is a start
alignment).  So fix this as well.

I'd like acks from Sam and David on this one.  Also CCing Paul, since
he has a patch from me which will need to be updated to use
BSS_SECTION(0, PAGE_SIZE, 4) once this gets merged.

Signed-off-by: Tim Abbott 
Cc: Paul Mundt 
Cc: David Howells 
Signed-off-by: Sam Ravnborg

linker script: unify usage of discard definition

2009-07-09T02:27:40+00:00

Discarded sections in different archs share some commonality but have
considerable differences.  This led to linker script for each arch
implementing its own /DISCARD/ definition, which makes maintaining
tedious and adding new entries error-prone.

This patch makes all linker scripts to move discard definitions to the
end of the linker script and use the common DISCARDS macro.  As ld
uses the first matching section definition, archs can include default
discarded sections by including them earlier in the linker script.

ia64 is notable because it first throws away some ia64 specific
subsections and then include the rest of the sections into the final
image, so those sections must be discarded before the inclusion.

defconfig compile tested for x86, x86-64, powerpc, powerpc64, ia64,
alpha, sparc, sparc64 and s390.  Michal Simek tested microblaze.

Signed-off-by: Tejun Heo 
Acked-by: Paul Mundt 
Acked-by: Mike Frysinger 
Tested-by: Michal Simek 
Cc: linux-arch@vger.kernel.org
Cc: Michal Simek 
Cc: microblaze-uclinux@itee.uq.edu.au
Cc: Sam Ravnborg 
Cc: Tony Luck

Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes

2009-07-04T16:46:01+00:00

* git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes:
  kbuild: finally remove the obsolete variable $TOPDIR
  gitignore: ignore scripts/ihex2fw
  Kbuild: Disable the -Wformat-security gcc flag
  gitignore: ignore gcov output files
  kbuild: deb-pkg ship changelog
  Add new __init_task_data macro to be used in arch init_task.c files.
  asm-generic/vmlinux.lds.h: shuffle INIT_TASK* macro names in vmlinux.lds.h
  Add new macros for page-aligned data and bss sections.
  asm-generic/vmlinux.lds.h: Fix up RW_DATA_SECTION definition.

Merge branch 'master' into for-next

2009-07-03T22:13:18+00:00

Pull linus#master to merge PER_CPU_DEF_ATTRIBUTES and alpha build fix
changes.  As alpha in percpu tree uses 'weak' attribute instead of
inline assembly, there's no need for __used attribute.

Conflicts:
	arch/alpha/include/asm/percpu.h
	arch/mn10300/kernel/vmlinux.lds.S
	include/linux/percpu-defs.h

gcov: fix __ctors_start alignment

2009-07-01T01:55:59+00:00

The ctors section for each object file is eight byte aligned (on 64 bit).
However the __ctors_start symbol starts at an arbitrary address dependent
on the size of the previous sections.

Therefore the linker may add some zeroes after __ctors_start to make sure
the ctors contents are properly aligned.  However the extra zeroes at the
beginning aren't expected by the code.  When walking the functions
pointers contained in there and extra zeroes are added this may result in
random jumps.  So make sure that the __ctors_start symbol is always
aligned as well.

Fixes this crash on an allyesconfig on s390:

[    0.582482] Kernel BUG at 0000000000000012 [verbose debug info unavailable]
[    0.582489] illegal operation: 0001 [#1] SMP DEBUG_PAGEALLOC
[    0.582496] Modules linked in:
[    0.582501] CPU: 0 Tainted: G        W  2.6.31-rc1-dirty #273
[    0.582506] Process swapper (pid: 1, task: 000000003f218000, ksp: 000000003f2238e8)
[    0.582510] Krnl PSW : 0704200180000000 0000000000000012 (0x12)
[    0.582518]            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:2 PM:0 EA:3
[    0.582524] Krnl GPRS: 0000000000036727 0000000000000010 0000000000000001 0000000000000001
[    0.582529]            00000000001dfefa 0000000000000000 0000000000000000 0000000000000040
[    0.582534]            0000000001fff0f0 0000000001790628 0000000002296048 0000000002296048
[    0.582540]            00000000020c438e 0000000001786000 0000000002014a66 000000003f223e60
[    0.582553] Krnl Code:>0000000000000012: 0000                unknown
[    0.582559]            0000000000000014: 0000                unknown
[    0.582564]            0000000000000016: 0000                unknown
[    0.582570]            0000000000000018: 0000                unknown
[    0.582575]            000000000000001a: 0000                unknown
[    0.582580]            000000000000001c: 0000                unknown
[    0.582585]            000000000000001e: 0000                unknown
[    0.582591]            0000000000000020: 0000                unknown
[    0.582596] Call Trace:
[    0.582599] ([<0000000002014a46>] kernel_init+0x622/0x7a0)
[    0.582607]  [<0000000000113e22>] kernel_thread_starter+0x6/0xc
[    0.582615]  [<0000000000113e1c>] kernel_thread_starter+0x0/0xc
[    0.582621] INFO: lockdep is turned off.
[    0.582624] Last Breaking-Event-Address:
[    0.582627]  [<0000000002014a64>] kernel_init+0x640/0x7a0

Cc: Peter Oberparleiter 
Cc: Ingo Molnar 
Cc: Martin Schwidefsky 
Signed-off-by: Heiko Carstens 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

asm-generic/vmlinux.lds.h: shuffle INIT_TASK* macro names in vmlinux.lds.h

2009-06-26T22:04:50+00:00

We recently added a INIT_TASK(align) in include/asm-generic/vmlinux.lds.h,
but there is already a macro INIT_TASK in include/linux/init_task.h, which
is quite confusing.  We should switch the macro in the linker script to
INIT_TASK_DATA. (Sorry that I missed this in reviewing the patch).  Since
the macros are new, there is only one user of the INIT_TASK in
vmlinux.lds.h, arch/mn10300/kernel/vmlinux.lds.S.

However, we are currently using INIT_TASK_DATA for laying down an entire
.data.init_task section.  So rename that to INIT_TASK_DATA_SECTION.

I would be worried about changing the meaning of INIT_TASK_DATA, but the
old INIT_TASK_DATA implementation had no users, and in fact if anyone had
tried to use it, it would have failed to compile because it didn't pass
the alignment to the old INIT_TASK.

Signed-off-by: Tim Abbott 
Cc: David Howells 
Cc: Jesper Nilsson