In the case of multiple FPU errors, prioritize the error codes,
instead of returning __SI_FAULT, which ends up pushing a 0 as the
error code to userspace, a POSIX violation.

For i386, we will simply return if there are no errors at all; for
x86-64 this is probably a "can't happen" (and the code should be
unified), but for this patch, return __SI_FAULT|SI_KERNEL if this ever
happens.
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Impact: fix deadlock

This is in response to the following bug report:

Bug-Entry       : http://bugzilla.kernel.org/show_bug.cgi?id=12100
Subject         : resume (S2R) broken by Intel microcode module, on A110L
Submitter       : Andreas Mohr <andi@lisas.de>
Date            : 2008-11-25 08:48 (19 days old)
Handled-By      : Dmitry Adamushko <dmitry.adamushko@gmail.com>

[ The deadlock scenario has been discovered by Andreas Mohr ]

I think I might have a logical explanation why the system:

  (http://bugzilla.kernel.org/show_bug.cgi?id=12100)

might hang upon resuming, OTOH it should have likely hanged each and every time.

(1) possible deadlock in microcode_resume_cpu() if either 'if' section is
taken;

(2) now, I don't see it in spec. and can't experimentally verify it (newer
ucodes don't seem to be available for my Core2duo)... but logically-wise, I'd
think that when read upon resuming, the 'microcode revision' (MSR 0x8B) should
be back to its original one (we need to reload ucode anyway so it doesn't seem
logical if a cpu doesn't drop the version)... if so, the comparison with
memcmp() for the full 'struct cpu_signature' is wrong... and that's how one of
the aforementioned 'if' sections might have been triggered - leading to a
deadlock.

Obviously, in my tests I simulated loading/resuming with the ucode of the same
version (just to see that the file is loaded/re-loaded upon resuming) so this
issue has never popped up.

I'd appreciate if someone with an appropriate system might give a try to the
2nd patch (titled "fix a comparison && deadlock...").

In any case, the deadlock situation is a must-have fix.
Reported-by: NAndreas Mohr <andi@lisas.de>
Signed-off-by: NDmitry Adamushko <dmitry.adamushko@gmail.com>
Tested-by: NAndreas Mohr <andi@lisas.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: Cleanup and branch hints only.

Move the track and untrack pfn stub routines from memory.c to asm-generic.
Also add unlikely to pfnmap related calls in fork and exit path.
Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Impact: Cleanup - removes a new function in favor of a recently modified older one.

Replace follow_pfnmap_pte in pat code with follow_phys. follow_phys lso
returns protection eliminating the need of pte_pgprot call. Using follow_phys
also eliminates the need for pte_pa.
Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Impact: cleanup

No need to declare do_signal().
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup, avoid sparse warnings, reduce kernel size a bit

Fixes these sparse warnings:

 arch/x86/kernel/cpu/common.c:869:6: warning: symbol 'boot_cpu_stack' was not declared. Should it be static?
 arch/x86/kernel/cpu/common.c:910:6: warning: symbol 'boot_exception_stacks' was not declared. Should it be static?
Signed-off-by: NJaswinder Singh <jaswinder@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

this warning:

  arch/x86/kernel/microcode_amd.c: In function ‘apply_microcode_amd’:
  arch/x86/kernel/microcode_amd.c:163: warning: cast from pointer to integer of different size
  arch/x86/kernel/microcode_amd.c:163: warning: cast from pointer to integer of different size

triggers because we want to pass the address to the microcode MSR,
which is 64-bit even on 32-bit. Cast it explicitly to express this.
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup

Remove struct sigfram32 and rt_sigframe32 because there is no user.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Impact: cleanup

Use rt_sigframe_ia32 instead of rt_sigframe32.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Impact: cleanup

Include following headers for dependency.
asm/sigcontext.h
asm/siginfo.h
asm/ucontext.h
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Impact: cleanup

 In asm/traps.h :-
 do_double_fault : added under X86_64
 sync_regs : added under X86_64
 math_error : moved out from X86_32 as it is common for both 32 and 64 bit
 math_emulate : moved from X86_32 as it is common for both 32 and 64 bit
 smp_thermal_interrupt : added under X86_64
 mce_threshold_interrupt : added under X86_64
Signed-off-by: NJaswinder Singh <jaswinder@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: New mm functionality.

Add pgprot_writecombine. pgprot_writecombine will be aliased to
pgprot_noncached when not supported by the architecture.
Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Impact: mm behavior change.

Make pgprot_noncached uc_minus instead of strong UC. This will make
pgprot_noncached to be in line with ioremap_nocache() and all the other
APIs that map page uc_minus on uc request.
Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Impact: New mm functionality.

Hookup remap_pfn_range and vm_insert_pfn and corresponding copy and free
routines with reserve and free tracking.

reserve and free here only takes care of non RAM region mapping. For RAM
region, driver should use set_memory_[uc|wc|wb] to set the cache type and
then setup the mapping for user pte. We can bypass below
reserve/free in that case.
Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Impact: cleanup, avoid sparse warning

Included asm/idle.h for c1e_remove_cpu() declaration. Fixes this
sparse warning:

  CHECK   arch/x86/kernel/process.c
  arch/x86/kernel/process.c:284:6: warning: symbol 'c1e_remove_cpu' was not declared. Should it be static?
Signed-off-by: NJaswinder Singh <jaswinder@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup

Add missing guard macro _ASM_X86_SIGFRAME_H.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

This commit:

commit 5cb04df8
Author: Ingo Molnar <mingo@elte.hu>
Date:   Sun May 4 19:49:04 2008 +0200

   x86: defconfig updates

changed CONFIG_RELOCATABLE from n to y, which may lead to a mismatch
between the vmlinux debug information and the runtime location of the
kernel, even when the bootloader does not relocate the kernel.

Revert the specific change. Works for me with GRUB and qemu.

Reference: http://lkml.org/lkml/2008/11/25/243Signed-off-by: NVegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

The favr-32 board code still refers to the old asm/arch header files
which were moved to mach/ some time ago.
Signed-off-by: NHaavard Skinnemoen <haavard.skinnemoen@atmel.com>

Enable JFFS2 write buffer support so that the kernel can access a root
filesystem in NAND flash.
Signed-off-by: NHaavard Skinnemoen <haavard.skinnemoen@atmel.com>

Impact: cleanup

In asm/syscalls.h move out sys_set_thread_area() and sys_get_thread_area()
as they are common for both 32 and 64 bit.
Signed-off-by: NJaswinder Singh <jaswinder@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup, reduce kernel size a bit
Signed-off-by: NJaswinder Singh <jaswinder@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: remove annoying bootup printk

It's perfectly normal for no AMD GART to be present, e.g., if you have
Intel CPUs.  None of the other iommu_init() functions makes noise when
it finds nothing.
Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: NJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup

Use arch/x86/include/asm/sigframe.h instead of defining redundant structures.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup, prepare to include sigframe.h

Rename struct sigframe to struct sigframe_ia32 and struct rt_sigframe to
struct rt_sigframe_ia32.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup, prepare to use from ia32_signal.c

Make struct sigframe_ia32 and rt_sigframe_ia32 visible to ia32_signal.c.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup, move header file

Move arch/x86/kernel/sigframe.h to arch/x86/include/asm/sigframe.h.
It will be used in arch/x86/ia32/ia32_signal.c.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup, prepare to move sigframe.h

On 32-bit, rename struct sigrame to struct sigframe_ia32, struct rt_sigframe
to struct rt_sigframe_ia32 and several structures.

And add helper macros to access the above data in arch/x86/kernel/signal.c.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup

Move declarations of ia32_setup_rt_frame() and ia32_setup_frame() into
arch/x86/kernel/signal.c.

This is for future use of sigframe.h.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

There is an error in rh_alloc_fixed() of the Remote Heap code:
If there is at least one free block blk won't be NULL at the end of the
search loop, so -ENOMEM won't be returned and the else branch of
"if (bs == s || be == e)" will be taken, corrupting the management
structures.
Signed-off-by: NGuillaume Knispel <gknispel@proformatique.com>
Acked-by: NTimur Tabi <timur@freescale.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

The commit e5e774d8
powerpc/fsl-booke: Fix problem with _tlbil_va being interrupted
introduce one issue. that casue the problem like this:

Kernel BUG at c00b19fc [verbose debug info unavailable]
Oops: Exception in kernel mode, sig: 5 [#1]
MPC8572 DS
Modules linked in:
NIP: c00b19fc LR: c00b1c34 CTR: c0064e88
REGS: ef02b7b0 TRAP: 0700   Not tainted  (2.6.28-rc8-00057-g1bda7128)
MSR: 00021000 <ME>  CR: 44048028  XER: 20000000
TASK = ef02c000[1] 'init' THREAD: ef02a000
GPR00: 00000001 ef02b860 ef02c000 eec201a0 c0dec2c0 00000000 000078a1 00000400
GPR08: c00b4e40 000078a1 c048ec00 a1780000 44048028 ecd26917 00000001 ef02b948
GPR16: ffffffea 0000020c 00000000 00000000 00000003 0000000a 00000000 000078a1
GPR24: eec201a0 00000000 ed849000 00000400 ef02b95c 00000001 ef02b978 ef02b984
NIP [c00b19fc] __find_get_block+0x24/0x238
LR [c00b1c34] __getblk+0x24/0x2a0
Call Trace:
[ef02b860] [c017b768] generic_make_request+0x290/0x328 (unreliable)
[ef02b8b0] [c00b1c34] __getblk+0x24/0x2a0
[ef02b910] [c00b4ae4] __bread+0x14/0xf8
[ef02b920] [c00fc228] ext2_get_branch+0xf0/0x138
[ef02b940] [c00fcc88] ext2_get_block+0xb8/0x828
[ef02ba00] [c00bbdc8] do_mpage_readpage+0x188/0x808
[ef02bac0] [c00bc5b4] mpage_readpages+0xec/0x144
[ef02bb50] [c00fba38] ext2_readpages+0x24/0x34
[ef02bb60] [c006ade0] __do_page_cache_readahead+0x150/0x230
[ef02bbb0] [c0064bdc] filemap_fault+0x31c/0x3e0
[ef02bbf0] [c00728b8] __do_fault+0x60/0x5b0
[ef02bc50] [c0011e0c] do_page_fault+0x2d8/0x4c4
[ef02bd10] [c000ed90] handle_page_fault+0xc/0x80
[ef02bdd0] [c00c7adc] set_brk+0x74/0x9c
[ef02bdf0] [c00c9274] load_elf_binary+0x70c/0x1180
[ef02be70] [c00945f0] search_binary_handler+0xa8/0x274
[ef02bea0] [c0095818] do_execve+0x19c/0x1d4
[ef02bed0] [c000766c] sys_execve+0x58/0x84
[ef02bef0] [c000e950] ret_from_syscall+0x0/0x3c
[ef02bfb0] [c009c6fc] sys_dup+0x24/0x6c
[ef02bfc0] [c0001e04] init_post+0xb0/0xf0
[ef02bfd0] [c046c1ac] kernel_init+0xcc/0xf4
[ef02bff0] [c000e6d0] kernel_thread+0x4c/0x68
Instruction dump:
4bffffa4 813f000c 4bffffac 9421ffb0 7c0802a6 7d800026 90010054 bf210034
91810030 7c0000a6 68008000 54008ffe <0f000000> 3d20c04e 3b29ffb8 38000008

The issue was the beqlr returns early but we haven't reenabled interrupts.
Signed-off-by: NDave Liu <daveliu@freescale.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

Impact: prevents data corruption after a failed completion wait loop
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: set cmd buffer head and tail pointers to zero in case nobody else did
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

This patch will remove the section .note.gnu.build-id added in binutils
2.18 from the vmlinux.bin binary. Not removing this section results in a
huge multiple gigabyte binary and likewize large uImage.
Signed-off-by: NHans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Signed-off-by: NHaavard Skinnemoen <haavard.skinnemoen@atmel.com>

In order to always provide fully synchronized state to the debugger,
we might need to do a synchronize_user_stack().

A pair of hooks, arch_ptrace_stop_needed() and arch_ptrace_stop(),
exist to handle this kind of situation.  It was created for
the sake of IA64.

Use them, to flush the kernel side cached register windows
to the user stack, when necessary.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Impact: cleanup

Use __USER32_DS instead of __USER_DS in ia32_signal.c.
No impact, because __USER32_DS is defined __USER_DS.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup

__put_user() can be used for constant size 8, like arch/x86/kernel/signal.c.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: cleanup

Call signal_fault() in error route of sys_sigreturn().
Change log level to KERN_EMERG if current is init.
Signed-off-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: fix crash

xpc needs to pass the physical address, not virtual.

Testing uncovered this problem.  The virtual address happens to work
most of the time due to the way bios was masking off the node bits.
Passing the physical address makes it work all of the time.
Signed-off-by: NRuss Anderson <rja@sgi.com>
Acked-by: NDean Nelson <dcn@sgi.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: fix disabled MCE after resume

Don't prevent multiple initialization of MCEs.

Back from early prehistory mcheck_init() has a reentry check. Presumably
that was needed in very old kernels to prevent it entering twice.

But as Andreas points out this prevents CPU hotplug (and therefore resume)
to correctly reinitialize MCEs when a AP boots again after being
offlined.

Just drop the check.
Reported-by: NAndreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Tested-by: NAndreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Impact: fix UV boot crash

This fixes a UV bug related to generating global memory addresses
on partitioned systems. Partition systems do not have physical memory
at address 0. Instead, a chunk of high memory is remapped by the chipset
so that it appears to be at address 0. This remapping is INVISIBLE to most
of the OS. The only OS functions that need to be aware of the remaping are
functions that directly interface to the chipset. The GRU is one example.

Also, delete a couple of unused macros related to global memory addresses.
Signed-off-by: NJack Steiner <steiner@sgi.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>