android_kernel_xiaomi_sm8350/include
Michael Ellerman fac23fe4be powerpc: Introduce infrastructure for feature sections with alternatives
The current feature section logic only supports nop'ing out code, this means
if you want to choose at runtime between instruction sequences, one or both
cases will have to execute the nop'ed out contents of the other section, eg:

BEGIN_FTR_SECTION
	or	1,1,1
END_FTR_SECTION_IFSET(FOO)
BEGIN_FTR_SECTION
	or	2,2,2
END_FTR_SECTION_IFCLR(FOO)

and the resulting code will be either,

	or	1,1,1
	nop

or,
	nop
	or	2,2,2

For small code segments this is fine, but for larger code blocks and in
performance criticial code segments, it would be nice to avoid the nops.
This commit starts to implement logic to allow the following:

BEGIN_FTR_SECTION
	or	1,1,1
FTR_SECTION_ELSE
	or	2,2,2
ALT_FTR_SECTION_END_IFSET(FOO)

and the resulting code will be:

	or	1,1,1
or,
	or	2,2,2

We achieve this by extending the existing FTR macros. The current feature
section semantic just becomes a special case, ie. if the else case is empty
we nop out the default case.

The key limitation is that the size of the else case must be less than or
equal to the size of the default case. If the else case is smaller the
remainder of the section is nop'ed.

We let the linker put the else case code in with the rest of the text,
so that relative branches from the else case are more likley to link,
this has the disadvantage that we can't free the unused else cases.

This commit introduces the required macro and linker script changes, but
does not enable the patching of the alternative sections.

We also need to update two hand-made section entries in reg.h and timex.h

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-07-01 11:28:28 +10:00
..
acpi proper prototype for acpi_processor_tstate_has_changed() 2008-06-11 19:13:46 -04:00
asm-alpha alpha: fix compile error in arch/alpha/mm/init.c 2008-06-23 18:26:04 -07:00
asm-arm [ARM] 5091/1: Add missing bitfield include to regs-lcd.h 2008-06-12 20:49:38 +01:00
asm-avr32
asm-blackfin Blackfin Serial Driver: Use timer to poll CTS PIN instead of workqueue. 2008-06-19 17:46:39 +08:00
asm-cris
asm-frv FRV: ip_fast_csum() requires a memory clobber on its inline asm 2008-06-05 10:31:21 -07:00
asm-generic kbuild: fix a.out.h export to userspace with O= build. 2008-06-27 23:13:54 +02:00
asm-h8300 h8300: fix typo in header guard 2008-06-06 11:29:12 -07:00
asm-ia64 [IA64] Fix CONFIG_IA64_SGI_UV build error 2008-06-16 09:02:03 -07:00
asm-m32r asm-m32r/uaccess.h must #include <asm/setup.h> 2008-06-06 11:29:13 -07:00
asm-m68k m68k: Add ext2_find_{first,next}_bit() for ext4 2008-06-12 18:05:39 -07:00
asm-m68knommu
asm-mips [MIPS] Malta: Fix build errors for 64-bit kernels 2008-06-16 15:14:48 +01:00
asm-mn10300
asm-parisc parisc: fix miscompilation of ip_fast_csum with gcc >= 4.3 2008-06-13 10:49:56 -04:00
asm-powerpc powerpc: Introduce infrastructure for feature sections with alternatives 2008-07-01 11:28:28 +10:00
asm-s390 [S390] Fix __ctl_load/__ctl_store inline assembly constraints 2008-06-10 10:03:28 +02:00
asm-sh sh: fix miscompilation of ip_fast_csum with gcc >= 4.3 2008-06-02 12:40:14 +09:00
asm-sparc
asm-sparc64 sparc64: IO accessors fix 2008-05-30 02:01:28 -07:00
asm-um uml: activate_mm: remove the dead PF_BORROWED_MM check 2008-06-06 11:36:22 -07:00
asm-v850 v850: fix typo in header guard 2008-06-06 11:29:12 -07:00
asm-x86 Merge branch 'kvm-updates-2.6.26' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm 2008-06-24 18:09:06 -07:00
asm-xtensa
crypto
keys
linux drivers/macintosh: Various cleanups 2008-07-01 11:28:06 +10:00
math-emu
media V4L/DVB (8092): videodev: simplify and fix standard enumeration 2008-06-26 15:58:57 -03:00
mtd
net netns: Don't receive new packets in a dead network namespace. 2008-06-20 22:16:51 -07:00
pcmcia
rdma IB/core: Remove IB_DEVICE_SEND_W_INV capability flag 2008-06-09 09:58:42 -07:00
rxrpc
scsi
sound [ALSA] ac97 - Fix ASUS A9T laptop output 2008-05-30 16:20:42 +02:00
video
xen x86: Make xen use the paravirt clocksource structs and functions 2008-06-24 21:02:32 +03:00
Kbuild