kernel.git/arch/x86/kernel/process.c, branch linux-2.6.37.y

x86, hotplug: Fix powersavings with offlined cores on AMD

2011-02-24T22:54:30Z

Upstream commits: 93789b32dbf355e70f18b17a82e8661677a7f7fb, 1c9d16e35911090dee3f9313e6af13af623d66ee ea53069231f9317062910d6e772cca4ce93de8c8 made a CPU use monitor/mwait when offline. This is not the optimal choice for AMD wrt to powersavings and we'd prefer our cores to halt (i.e. enter C1) instead. For this, the same selection whether to use monitor/mwait has to be used as when we select the idle routine for the machine. With this patch, offlining cores 1-5 on a X6 machine allows core0 to boost again. [ hpa: putting this in urgent since it is a (power) regression fix ] Reported-by: Andreas Herrmann Cc: H. Peter Anvin Cc: Arjan van de Ven Cc: Len Brown Cc: Venkatesh Pallipadi Cc: Peter Zijlstra Signed-off-by: Borislav Petkov LKML-Reference: <1295534572-10730-1-git-send-email-bp@amd64.org> Signed-off-by: H. Peter Anvin Signed-off-by: Greg Kroah-Hartman

x86, dmi, debug: Log board name (when present) in dmesg/oops output

2011-02-17T23:15:08Z

commit 84e383b322e5348db03be54ff64cc6da87003717 upstream. The "Type 2" SMBIOS record that contains Board Name is not strictly required and may be absent in the SMBIOS on some platforms. ( Please note that Type 2 is not listed in Table 3 in Sec 6.2 ("Required Structures and Data") of the SMBIOS v2.7 Specification. ) Use the Manufacturer Name (aka System Vendor) name. Print Board Name only when it is present. Before the fix: (i) dmesg output: DMI: /ProLiant DL380 G6, BIOS P62 01/29/2011 (ii) oops output: Pid: 2170, comm: bash Not tainted 2.6.38-rc4+ #3 /ProLiant DL380 G6 After the fix: (i) dmesg output: DMI: HP ProLiant DL380 G6, BIOS P62 01/29/2011 (ii) oops output: Pid: 2278, comm: bash Not tainted 2.6.38-rc4+ #4 HP ProLiant DL380 G6 Signed-off-by: Naga Chumbalkar Reviewed-by: Bjorn Helgaas LKML-Reference: <20110214224423.2182.13929.sendpatchset@nchumbalkar.americas.hpqcorp.net> Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman

Make do_execve() take a const filename pointer

2010-08-18T01:07:43Z

Make do_execve() take a const filename pointer so that kernel_execve() compiles correctly on ARM: arch/arm/kernel/sys_arm.c:88: warning: passing argument 1 of 'do_execve' discards qualifiers from pointer target type This also requires the argv and envp arguments to be consted twice, once for the pointer array and once for the strings the array points to. This is because do_execve() passes a pointer to the filename (now const) to copy_strings_kernel(). A simpler alternative would be to cast the filename pointer in do_execve() when it's passed to copy_strings_kernel(). do_execve() may not change any of the strings it is passed as part of the argv or envp lists as they are some of them in .rodata, so marking these strings as const should be fine. Further kernel_execve() and sys_execve() need to be changed to match. This has been test built on x86_64, frv, arm and mips. Signed-off-by: David Howells Tested-by: Ralf Baechle Acked-by: Russell King Signed-off-by: Linus Torvalds

Mark arguments to certain syscalls as being const

2010-08-13T23:53:13Z

Mark arguments to certain system calls as being const where they should be but aren't. The list includes: (*) The filename arguments of various stat syscalls, execve(), various utimes syscalls and some mount syscalls. (*) The filename arguments of some syscall helpers relating to the above. (*) The buffer argument of various write syscalls. Signed-off-by: David Howells Acked-by: David S. Miller Signed-off-by: Linus Torvalds

Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2010-08-06T17:02:36Z

* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86: Fix keeping track of AMD C1E x86, cpu: Package Level Thermal Control, Power Limit Notification definitions x86, cpu: Export AMD errata definitions x86, cpu: Use AMD errata checking framework for erratum 383 x86, cpu: Clean up AMD erratum 400 workaround x86, cpu: AMD errata checking framework x86, cpu: Split addon_cpuid_features.c x86, cpu: Clean up formatting in cpufeature.h, remove override x86, cpu: Enumerate xsaveopt x86, cpu: Add xsaveopt cpufeature x86, cpu: Make init_scattered_cpuid_features() consider cpuid subleaves x86, cpu: Support the features flags in new CPUID leaf 7 x86, cpu: Add CPU flags for F16C and RDRND x86: Look for IA32_ENERGY_PERF_BIAS support x86, AMD: Extend support to future families x86, cacheinfo: Carve out L3 cache slot accessors x86, xsave: Cleanup return codes in check_for_xstate()

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq

2010-08-04T18:13:36Z

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq: [CPUFREQ] Remove pointless printk from p4-clockmod. [CPUFREQ] Fix section mismatch for powernow_cpu_init in powernow-k7.c [CPUFREQ] Fix section mismatch for longhaul_cpu_init. [CPUFREQ] Fix section mismatch for longrun_cpu_init. [CPUFREQ] powernow-k8: Fix misleading variable naming [CPUFREQ] Convert pci_table entries to PCI_VDEVICE (if PCI_ANY_ID is used) [CPUFREQ] arch/x86/kernel/cpu/cpufreq: use for_each_pci_dev() [CPUFREQ] fix brace coding style issue. [CPUFREQ] x86 cpufreq: Make trace_power_frequency cpufreq driver independent [CPUFREQ] acpi-cpufreq: Fix CPU_ANY CPUFREQ_{PRE,POST}CHANGE notification [CPUFREQ] ondemand: don't synchronize sample rate unless multiple cpus present [CPUFREQ] unexport (un)lock_policy_rwsem* functions [CPUFREQ] ondemand: Refactor frequency increase code [CPUFREQ] powernow-k8: On load failure, remind the user to enable support in BIOS setup [CPUFREQ] powernow-k8: Limit Pstate transition latency check [CPUFREQ] Fix PCC driver error path [CPUFREQ] fix double freeing in error path of pcc-cpufreq [CPUFREQ] pcc driver should check for pcch method before calling _OSC [CPUFREQ] fix memory leak in cpufreq_add_dev [CPUFREQ] revert "[CPUFREQ] remove rwsem lock from CPUFREQ_GOV_STOP call (second call site)" Manually fix up non-data merge conflict introduced by new calling conventions for trace_power_start() in commit 6f4f2723d085 ("x86 cpufreq: Make trace_power_frequency cpufreq driver independent"), which didn't update the intel_idle native hardware cpuidle driver.

[CPUFREQ] x86 cpufreq: Make trace_power_frequency cpufreq driver independent

2010-08-03T17:47:05Z

and fix the broken case if a core's frequency depends on others. trace_power_frequency was only implemented in a rather ungeneric way in acpi-cpufreq driver's target() function only. -> Move the call to trace_power_frequency to cpufreq.c:cpufreq_notify_transition() where CPUFREQ_POSTCHANGE notifier is triggered. This will support power frequency tracing by all cpufreq drivers trace_power_frequency did not trace frequency changes correctly when the userspace governor was used or when CPU cores' frequency depend on each other. -> Moving this into the CPUFREQ_POSTCHANGE notifier and pass the cpu which gets switched automatically fixes this. Robert Schoene provided some important fixes on top of my initial quick shot version which are integrated in this patch: - Forgot some changes in power_end trace (TP_printk/variable names) - Variable dummy in power_end must now be cpu_id - Use static 64 bit variable instead of unsigned int for cpu_id Signed-off-by: Thomas Renninger CC: davej@redhat.com CC: arjan@infradead.org CC: linux-kernel@vger.kernel.org CC: robert.schoene@tu-dresden.de Tested-by: robert.schoene@tu-dresden.de Signed-off-by: Dave Jones

x86: Fix keeping track of AMD C1E

2010-08-02T15:45:56Z

Accomodate the original C1E-aware idle routine to the different times during boot when the BIOS enables C1E. While at it, remove the synthetic CPUID flag in favor of a single global setting which denotes C1E status on the system. [ hpa: changed c1e_enabled to be a bool; clarified cpu bit 3:21 comment ] Signed-off-by: Michal Schmidt LKML-Reference: <20100727165335.GA11630@aftab> Signed-off-by: Borislav Petkov Signed-off-by: H. Peter Anvin Acked-by: Thomas Gleixner

x86: Export FPU API for KVM use

2010-08-01T07:35:48Z

Also add some constants. Signed-off-by: Sheng Yang Signed-off-by: Avi Kivity

x86, cpu: Clean up AMD erratum 400 workaround

2010-07-28T20:12:11Z

Remove check_c1e_idle() and use the new AMD errata checking framework instead. Signed-off-by: Hans Rosenfeld LKML-Reference: <1280336972-865982-2-git-send-email-hans.rosenfeld@amd.com> Signed-off-by: H. Peter Anvin