linux/arch, branch v4.19

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

2018-10-20T13:04:23Z

Ingo writes: "x86 fixes: It's 4 misc fixes, 3 build warning fixes and 3 comment fixes. In hindsight I'd have left out the 3 comment fixes to make the pull request look less scary at such a late point in the cycle. :-/" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/swiotlb: Enable swiotlb for > 4GiG RAM on 32-bit kernels x86/fpu: Fix i486 + no387 boot crash by only saving FPU registers on context switch if there is an FPU x86/fpu: Remove second definition of fpu in __fpu__restore_sig() x86/entry/64: Further improve paranoid_entry comments x86/entry/32: Clear the CS high bits x86/boot: Add -Wno-pointer-sign to KBUILD_CFLAGS x86/time: Correct the attribute on jiffies' definition x86/entry: Add some paranoid entry/exit CR3 handling comments x86/percpu: Fix this_cpu_read() x86/tsc: Force inlining of cyc2ns bits

x86/swiotlb: Enable swiotlb for > 4GiG RAM on 32-bit kernels

2018-10-19T05:49:32Z

We already build the swiotlb code for 32-bit kernels with PAE support, but the code to actually use swiotlb has only been enabled for 64-bit kernels for an unknown reason. Before Linux v4.18 we paper over this fact because the networking code, the SCSI layer and some random block drivers implemented their own bounce buffering scheme. [ mingo: Changelog fixes. ] Fixes: 21e07dba9fb1 ("scsi: reduce use of block bounce buffers") Fixes: ab74cfebafa3 ("net: remove the PCI_DMA_BUS_IS_PHYS check in illegal_highdma") Reported-by: Matthew Whitehead Signed-off-by: Christoph Hellwig Signed-off-by: Thomas Gleixner Tested-by: Matthew Whitehead Cc: konrad.wilk@oracle.com Cc: iommu@lists.linux-foundation.org Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20181014075208.2715-1-hch@lst.de Signed-off-by: Ingo Molnar

sparc: vDSO: Silence an uninitialized variable warning

2018-10-18T04:55:02Z

Smatch complains that "val" would be uninitialized if kstrtoul() fails. Fixes: 9a08862a5d2e ("vDSO for sparc") Signed-off-by: Dan Carpenter Signed-off-by: David S. Miller

sparc: Fix syscall fallback bugs in VDSO.

2018-10-18T04:29:23Z

First, the trap number for 32-bit syscalls is 0x10. Also, only negate the return value when syscall error is indicated by the carry bit being set. Signed-off-by: David S. Miller

Merge branch 'parisc-4.19-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2018-10-17T12:01:00Z

Helge writes: "parisc fix: Fix an unitialized variable usage in the parisc unwind code." * 'parisc-4.19-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Fix uninitialized variable usage in unwind.c

x86/fpu: Fix i486 + no387 boot crash by only saving FPU registers on context switch if there is an FPU

2018-10-17T10:30:38Z

Booting an i486 with "no387 nofxsr" ends with with the following crash: math_emulate: 0060:c101987d Kernel panic - not syncing: Math emulation needed in kernel on the first context switch in user land. The reason is that copy_fpregs_to_fpstate() tries FNSAVE which does not work as the FPU is turned off. This bug was introduced in: f1c8cd0176078 ("x86/fpu: Change fpu->fpregs_active users to fpu->fpstate_active") Add a check for X86_FEATURE_FPU before trying to save FPU registers (we have such a check in switch_fpu_finish() already). Signed-off-by: Sebastian Andrzej Siewior Reviewed-by: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: stable@vger.kernel.org Fixes: f1c8cd0176078 ("x86/fpu: Change fpu->fpregs_active users to fpu->fpstate_active") Link: http://lkml.kernel.org/r/20181016202525.29437-4-bigeasy@linutronix.de Signed-off-by: Ingo Molnar

x86/fpu: Remove second definition of fpu in fpurestore_sig()

2018-10-17T10:30:31Z

Commit: c5bedc6847c3b ("x86/fpu: Get rid of PF_USED_MATH usage, convert it to fpu->fpstate_active") introduced the 'fpu' variable at top of __restore_xstate_sig(), which now shadows the other definition: arch/x86/kernel/fpu/signal.c:318:28: warning: symbol 'fpu' shadows an earlier one arch/x86/kernel/fpu/signal.c:271:20: originally declared here Remove the shadowed definition of 'fpu', as the two definitions are the same. Signed-off-by: Sebastian Andrzej Siewior Reviewed-by: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Fixes: c5bedc6847c3b ("x86/fpu: Get rid of PF_USED_MATH usage, convert it to fpu->fpstate_active") Link: http://lkml.kernel.org/r/20181016202525.29437-3-bigeasy@linutronix.de Signed-off-by: Ingo Molnar

x86/entry/64: Further improve paranoid_entry comments

2018-10-17T10:30:27Z

Commit: 16561f27f94e ("x86/entry: Add some paranoid entry/exit CR3 handling comments") ... added some comments. This improves them a bit: - When I first read the new comments, it was unclear to me whether they were referring to the case where paranoid_entry interrupted other entry code or where paranoid_entry was itself interrupted. Clarify it. - Remove the EBX comment. We no longer use EBX as a SWAPGS indicator. Signed-off-by: Andy Lutomirski Acked-by: Thomas Gleixner Cc: Borislav Petkov Cc: Dave Hansen Cc: Linus Torvalds Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/c47daa1888dc2298e7e1d3f82bd76b776ea33393.1539542111.git.luto@kernel.org Signed-off-by: Ingo Molnar

x86/entry/32: Clear the CS high bits

2018-10-17T10:30:20Z

Even if not on an entry stack, the CS's high bits must be initialized because they are unconditionally evaluated in PARANOID_EXIT_TO_KERNEL_MODE. Failing to do so broke the boot on Galileo Gen2 and IOT2000 boards. [ bp: Make the commit message tone passive and impartial. ] Fixes: b92a165df17e ("x86/entry/32: Handle Entry from Kernel-Mode on Entry-Stack") Signed-off-by: Jan Kiszka Signed-off-by: Borislav Petkov Reviewed-by: Joerg Roedel Acked-by: Joerg Roedel CC: "H. Peter Anvin" CC: Andrea Arcangeli CC: Andy Lutomirski CC: Boris Ostrovsky CC: Brian Gerst CC: Dave Hansen CC: David Laight CC: Denys Vlasenko CC: Eduardo Valentin CC: Greg KH CC: Ingo Molnar CC: Jiri Kosina CC: Josh Poimboeuf CC: Juergen Gross CC: Linus Torvalds CC: Peter Zijlstra CC: Thomas Gleixner CC: Will Deacon CC: aliguori@amazon.com CC: daniel.gruss@iaik.tugraz.at CC: hughd@google.com CC: keescook@google.com CC: linux-mm CC: x86-ml Link: http://lkml.kernel.org/r/f271c747-1714-5a5b-a71f-ae189a093b8d@siemens.com Signed-off-by: Ingo Molnar

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc

2018-10-16T16:53:31Z

David writes: "Sparc fixes 1) Revert the %pOF change, it causes regressions. 2) Wire up io_pgetevents(). 3) Fix perf events on single-PCR sparc64 cpus. 4) Do proper perf event throttling like arm and x86." * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc: Revert "sparc: Convert to using %pOFn instead of device_node.name" sparc64: Set %l4 properly on trap return after handling signals. sparc64: Make proc_id signed. sparc: Throttle perf events properly. sparc: Fix single-pcr perf event counter management. sparc: Wire up io_pgetevents system call. sunvdc: Remove VLA usage