linux/include
Andi Kleen c8399943bd x86, generic: mark complex bitops.h inlines as __always_inline
Impact: reduce kernel image size

Hugh Dickins noticed that older gcc versions when the kernel
is built for code size didn't inline some of the bitops.

Mark all complex x86 bitops that have more than a single
asm statement or two as always inline to avoid this problem.

Probably should be done for other architectures too.

Ingo then found a better fix that only requires
a single line change, but it unfortunately only
works on gcc 4.3.

On older gccs the original patch still makes a ~0.3% defconfig
difference with CONFIG_OPTIMIZE_INLINING=y.

With gcc 4.1 and a defconfig like build:

    6116998 1138540  883788 8139326  7c323e vmlinux-oi-with-patch
    6137043 1138540  883788 8159371  7c808b vmlinux-optimize-inlining

~20k / 0.3% difference.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-13 18:56:30 +01:00
..
acpi Merge branch 'simplify_PRT' into release 2009-01-09 03:41:08 -05:00
asm-arm
asm-frv NOMMU: Make VMAs per MM as for MMU-mode linux 2009-01-08 12:04:47 +00:00
asm-generic x86, generic: mark complex bitops.h inlines as __always_inline 2009-01-13 18:56:30 +01:00
asm-h8300
asm-m32r NOMMU: Make VMAs per MM as for MMU-mode linux 2009-01-08 12:04:47 +00:00
asm-m68k m68k: introduce asm/swab.h 2009-01-06 18:10:27 -08:00
asm-mn10300 mn10300: introduce asm/swab.h 2009-01-06 18:10:29 -08:00
crypto
drm
keys
linux libata: Add a per-host flag to opt-in into parallel port probes 2009-01-10 15:06:52 -08:00
math-emu
media
mtd trivial: fix then -> than typos in comments and documentation 2009-01-06 11:28:06 +01:00
net Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2009-01-09 11:52:14 -08:00
pcmcia
rdma
rxrpc
scsi [SCSI] fc transport: restore missing dev_loss_tmo callback to LLDD 2009-01-06 09:43:33 -06:00
sound Merge branch 'topic/asoc' into for-linus 2009-01-06 09:48:51 +01:00
trace
video
xen xen: add xenfs to allow usermode <-> Xen interaction 2009-01-08 08:30:59 -08:00
Kbuild