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Gerd Hoffmann 9a0b5817ad [PATCH] x86: SMP alternatives ... Implement SMP alternatives, i.e. switching at runtime between different code versions for UP and SMP. The code can patch both SMP->UP and UP->SMP. The UP->SMP case is useful for CPU hotplug. With CONFIG_CPU_HOTPLUG enabled the code switches to UP at boot time and when the number of CPUs goes down to 1, and switches to SMP when the number of CPUs goes up to 2. Without CONFIG_CPU_HOTPLUG or on non-SMP-capable systems the code is patched once at boot time (if needed) and the tables are released afterwards. The changes in detail: * The current alternatives bits are moved to a separate file, the SMP alternatives code is added there. * The patch adds some new elf sections to the kernel: .smp_altinstructions like .altinstructions, also contains a list of alt_instr structs. .smp_altinstr_replacement like .altinstr_replacement, but also has some space to save original instruction before replaving it. .smp_locks list of pointers to lock prefixes which can be nop'ed out on UP. The first two are used to replace more complex instruction sequences such as spinlocks and semaphores. It would be possible to deal with the lock prefixes with that as well, but by handling them as special case the table sizes become much smaller. * The sections are page-aligned and padded up to page size, so they can be free if they are not needed. * Splitted the code to release init pages to a separate function and use it to release the elf sections if they are unused. Signed-off-by: Gerd Hoffmann <kraxel@suse.de> Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
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skas	[PATCH] uml: remove a dead file	19 years ago
tt	[PATCH] uml: TT - SYSCALL_DEBUG - fix buglet introduced in cleanup	19 years ago
Makefile	[PATCH] uml: move libc-dependent time code	19 years ago
asm-offsets.c	[PATCH] uml: fix missing KBUILD_BASENAME	19 years ago
config.c.in	…
dyn.lds.S	[PATCH] i386 / uml: add dwarf sections to static link script	20 years ago
exec_kern.c	[PATCH] uml: some harmless sparse warning fixes	19 years ago
exitcode.c	[PATCH] uml: Clean up prink calls	20 years ago
gmon_syms.c	…
gprof_syms.c	…
init_task.c	[PATCH] uml: move libc code out of mem_user.c and tempfile.c	20 years ago
initrd.c	[PATCH] uml: initrd cleanup	20 years ago
irq.c	[PATCH] useless linux/irq.h includes (arch/um)	20 years ago
irq_user.c	[PATCH] uml: move libc-dependent code from signal_user.c	19 years ago
ksyms.c	[PATCH] uml: separate libc-dependent helper code	19 years ago
mem.c	[PATCH] remove set_page_count() outside mm/	19 years ago
physmem.c	[PATCH] remove set_page_count(page, 0) users (outside mm)	19 years ago
process_kern.c	[PATCH] uml: avoid malloc to sleep in atomic sections	19 years ago
ptrace.c	[PATCH] consolidate sys_ptrace()	19 years ago
reboot.c	[PATCH] uml: avoid "CONFIG_NR_CPUS undeclared" bogus error messages	19 years ago
resource.c	…
sigio_kern.c	…
sigio_user.c	[PATCH] uml: sigio code - reduce spinlock hold time	19 years ago
signal_kern.c	[PATCH] uml: use generic sys_rt_sigsuspend	19 years ago
smp.c	…
syscall.c	[PATCH] uml: move libc-dependent time code	19 years ago
syscall_kern.c	[PATCH] uml: fork cleanup	20 years ago
sysrq.c	[PATCH] uml: Fix sysrq-r support for skas mode	20 years ago
time.c	[PATCH] hrtimer: convert posix timers completely	19 years ago
time_kern.c	[PATCH] uml: TT mode softint fixes	19 years ago
tlb.c	[PATCH] uml: fix condition in tlb flush	20 years ago
trap_kern.c	[PATCH] uml: merge trap_user.c and trap_kern.c	19 years ago
tty_log.c	…
uaccess.c	[PATCH] uml: separate libc-dependent uaccess code	19 years ago
um_arch.c	[PATCH] x86: SMP alternatives	19 years ago
umid.c	[PATCH] uml: umid cleanup	19 years ago
uml.lds.S	[PATCH] i386 / uml: add dwarf sections to static link script	20 years ago
vmlinux.lds.S	…