android_kernel_xiaomi_sm8350/arch/powerpc
Paul Mackerras d04c56f73c [POWERPC] Lazy interrupt disabling for 64-bit machines
This implements a lazy strategy for disabling interrupts.  This means
that local_irq_disable() et al. just clear the 'interrupts are
enabled' flag in the paca.  If an interrupt comes along, the interrupt
entry code notices that interrupts are supposed to be disabled, and
clears the EE bit in SRR1, clears the 'interrupts are hard-enabled'
flag in the paca, and returns.  This means that interrupts only
actually get disabled in the processor when an interrupt comes along.

When interrupts are enabled by local_irq_enable() et al., the code
sets the interrupts-enabled flag in the paca, and then checks whether
interrupts got hard-disabled.  If so, it also sets the EE bit in the
MSR to hard-enable the interrupts.

This has the potential to improve performance, and also makes it
easier to make a kernel that can boot on iSeries and on other 64-bit
machines, since this lazy-disable strategy is very similar to the
soft-disable strategy that iSeries already uses.

This version renames paca->proc_enabled to paca->soft_enabled, and
changes a couple of soft-disables in the kexec code to hard-disables,
which should fix the crash that Michael Ellerman saw.  This doesn't
yet use a reserved CR field for the soft_enabled and hard_enabled
flags.  This applies on top of Stephen Rothwell's patches to make it
possible to build a combined iSeries/other kernel.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-10-16 16:31:36 +10:00
..
boot [POWERPC] cell: fix default zImage build target 2006-10-10 11:54:26 +10:00
configs [POWERPC] Add DOS partition table support to mpc834x_itx_defconfig 2006-10-16 15:52:14 +10:00
kernel [POWERPC] Lazy interrupt disabling for 64-bit machines 2006-10-16 16:31:36 +10:00
lib [POWERPC] Fix rheap alignment problem 2006-10-02 20:27:47 +10:00
math-emu [POWERPC] ppc math-emu needs -fno-builtin-fabs for math.c and fabs.c 2006-09-26 15:24:35 +10:00
mm [PATCH] mm: use symbolic names instead of indices for zone initialisation 2006-10-11 11:14:14 -07:00
oprofile fix file specification in comments 2006-10-03 23:01:26 +02:00
platforms [POWERPC] Lazy interrupt disabling for 64-bit machines 2006-10-16 16:31:36 +10:00
sysdev [HEADERS] Put linux/config.h out of its misery. 2006-10-09 19:13:51 -04:00
xmon [POWERPC] Fix xmon IRQ handler for pt_regs removal 2006-10-10 11:47:07 +10:00
Kconfig Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2006-10-04 08:16:37 -07:00
Kconfig.debug [POWERPC] print backtrace when entering xmon 2006-09-13 18:39:53 +10:00
Makefile [POWERPC] Create a "wrapper" script and use it in arch/powerpc/boot 2006-09-28 14:30:02 +10:00