From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Helge Deller <deller@gmx.de>
Subject: [PATCH 4.9 64/76] parisc: Detect QEMU earlier in boot process
Date: Mon, 15 Apr 2019 20:44:28 +0200 [thread overview]
Message-ID: <20190415183726.478117691@linuxfoundation.org> (raw)
In-Reply-To: <20190415183707.712011689@linuxfoundation.org>
From: Helge Deller <deller@gmx.de>
commit d006e95b5561f708d0385e9677ffe2c46f2ae345 upstream.
While adding LASI support to QEMU, I noticed that the QEMU detection in
the kernel happens much too late. For example, when a LASI chip is found
by the kernel, it registers the LASI LED driver as well. But when we
run on QEMU it makes sense to avoid spending unnecessary CPU cycles, so
we need to access the running_on_QEMU flag earlier than before.
This patch now makes the QEMU detection the fist task of the Linux
kernel by moving it to where the kernel enters the C-coding.
Fixes: 310d82784fb4 ("parisc: qemu idle sleep support")
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v4.14+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/parisc/kernel/process.c | 6 ------
arch/parisc/kernel/setup.c | 3 +++
2 files changed, 3 insertions(+), 6 deletions(-)
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -206,12 +206,6 @@ void __cpuidle arch_cpu_idle(void)
static int __init parisc_idle_init(void)
{
- const char *marker;
-
- /* check QEMU/SeaBIOS marker in PAGE0 */
- marker = (char *) &PAGE0->pad0;
- running_on_qemu = (memcmp(marker, "SeaBIOS", 8) == 0);
-
if (!running_on_qemu)
cpu_idle_poll_ctrl(1);
--- a/arch/parisc/kernel/setup.c
+++ b/arch/parisc/kernel/setup.c
@@ -403,6 +403,9 @@ void start_parisc(void)
int ret, cpunum;
struct pdc_coproc_cfg coproc_cfg;
+ /* check QEMU/SeaBIOS marker in PAGE0 */
+ running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0);
+
cpunum = smp_processor_id();
set_firmware_width_unlocked();
next prev parent reply other threads:[~2019-04-15 18:48 UTC|newest]
Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-15 18:43 [PATCH 4.9 00/76] 4.9.169-stable review Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 01/76] x86/power: Fix some ordering bugs in __restore_processor_context() Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 02/76] x86/power/64: Use struct desc_ptr for the IDT in struct saved_context Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 03/76] x86/power/32: Move SYSENTER MSR restoration to fix_processor_context() Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 04/76] x86/power: Make restore_processor_context() sane Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 05/76] powerpc/tm: Limit TM code inside PPC_TRANSACTIONAL_MEM Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 06/76] kbuild: clang: choose GCC_TOOLCHAIN_DIR not on LD Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 07/76] x86: vdso: Use $LD instead of $CC to link Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 08/76] x86/vdso: Drop implicit common-page-size linker flag Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 09/76] lib/string.c: implement a basic bcmp Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 10/76] powerpc: Fix invalid use of register expressions Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 11/76] powerpc/64s: Add barrier_nospec Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 12/76] powerpc/64s: Add support for ori barrier_nospec patching Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 13/76] powerpc: Avoid code patching freed init sections Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 14/76] powerpc/64s: Patch barrier_nospec in modules Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 15/76] powerpc/64s: Enable barrier_nospec based on firmware settings Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 16/76] powerpc: Use barrier_nospec in copy_from_user() Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 17/76] powerpc/64: Use barrier_nospec in syscall entry Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 18/76] powerpc/64s: Enhance the information in cpu_show_spectre_v1() Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 19/76] powerpc64s: Show ori31 availability in spectre_v1 sysfs file not v2 Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 20/76] powerpc/64: Disable the speculation barrier from the command line Greg Kroah-Hartman
2019-04-16 15:43 ` Diana Madalina Craciun
2019-04-16 18:46 ` Greg Kroah-Hartman
2019-04-17 8:41 ` Michael Ellerman
2019-04-15 18:43 ` [PATCH 4.9 21/76] powerpc/64: Make stf barrier PPC_BOOK3S_64 specific Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 22/76] powerpc/64: Add CONFIG_PPC_BARRIER_NOSPEC Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 23/76] powerpc/64: Call setup_barrier_nospec() from setup_arch() Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 24/76] powerpc/64: Make meltdown reporting Book3S 64 specific Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 25/76] powerpc/fsl: Add barrier_nospec implementation for NXP PowerPC Book3E Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 26/76] powerpc/fsl: Sanitize the syscall table for NXP PowerPC 32 bit platforms Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 27/76] powerpc/asm: Add a patch_site macro & helpers for patching instructions Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 28/76] powerpc/64s: Add new security feature flags for count cache flush Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 29/76] powerpc/64s: Add support for software " Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 30/76] powerpc/pseries: Query hypervisor for count cache flush settings Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 31/76] powerpc/powernv: Query firmware " Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 32/76] powerpc/fsl: Add infrastructure to fixup branch predictor flush Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 33/76] powerpc/fsl: Add macro to flush the branch predictor Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 34/76] powerpc/fsl: Fix spectre_v2 mitigations reporting Greg Kroah-Hartman
2019-04-15 18:43 ` [PATCH 4.9 35/76] powerpc/fsl: Emulate SPRN_BUCSR register Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 36/76] powerpc/fsl: Add nospectre_v2 command line argument Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 37/76] powerpc/fsl: Flush the branch predictor at each kernel entry (64bit) Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 38/76] powerpc/fsl: Flush the branch predictor at each kernel entry (32 bit) Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 39/76] powerpc/fsl: Flush branch predictor when entering KVM Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 40/76] powerpc/fsl: Enable runtime patching if nospectre_v2 boot arg is used Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 41/76] powerpc/fsl: Update Spectre v2 reporting Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 42/76] powerpc/fsl: Fixed warning: orphan section `__btb_flush_fixup Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 43/76] powerpc/fsl: Fix the flush of branch predictor Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 44/76] powerpc/security: Fix spectre_v2 reporting Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 45/76] arm64: kaslr: Reserve size of ARM64_MEMSTART_ALIGN in linear region Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 46/76] tty: mark Siemens R3964 line discipline as BROKEN Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 47/76] tty: ldisc: add sysctl to prevent autoloading of ldiscs Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 48/76] ipv6: Fix dangling pointer when ipv6 fragment Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 49/76] ipv6: sit: reset ip header pointer in ipip6_rcv Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 50/76] kcm: switch order of device registration to fix a crash Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 51/76] net: rds: force to destroy connection if t_sock is NULL in rds_tcp_kill_sock() Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 52/76] openvswitch: fix flow actions reallocation Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 53/76] qmi_wwan: add Olicard 600 Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 54/76] sctp: initialize _pad of sockaddr_in before copying to user memory Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 55/76] tcp: Ensure DCTCP reacts to losses Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 56/76] vrf: check accept_source_route on the original netdevice Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 57/76] bnxt_en: Reset device on RX buffer errors Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 58/76] bnxt_en: Improve RX consumer index validity check Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 59/76] net/mlx5e: Add a lock on tir list Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 60/76] netns: provide pure entropy for net_hash_mix() Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 61/76] net: ethtool: not call vzalloc for zero sized memory request Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 62/76] ip6_tunnel: Match to ARPHRD_TUNNEL6 for dev type Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 63/76] ALSA: seq: Fix OOB-reads from strlcpy Greg Kroah-Hartman
2019-04-15 18:44 ` Greg Kroah-Hartman [this message]
2019-04-16 13:49 ` [PATCH 4.9 64/76] parisc: Detect QEMU earlier in boot process Helge Deller
2019-04-16 13:50 ` Helge Deller
2019-04-16 14:23 ` Greg Kroah-Hartman
2019-04-16 15:00 ` Helge Deller
2019-04-16 18:03 ` Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 65/76] include/linux/bitrev.h: fix constant bitrev Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 66/76] ASoC: fsl_esai: fix channel swap issue when stream starts Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 67/76] Btrfs: do not allow trimming when a fs is mounted with the nologreplay option Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 68/76] block: do not leak memory in bio_copy_user_iov() Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 69/76] genirq: Respect IRQCHIP_SKIP_SET_WAKE in irq_chip_set_wake_parent() Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 70/76] virtio: Honour may_reduce_num in vring_create_virtqueue Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 71/76] ARM: dts: at91: Fix typo in ISC_D0 on PC9 Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 72/76] arm64: futex: Fix FUTEX_WAKE_OP atomic ops with non-zero result value Greg Kroah-Hartman
2019-04-15 22:01 ` Nathan Chancellor
2019-04-16 9:00 ` Greg Kroah-Hartman
2019-04-16 16:47 ` Nathan Chancellor
2019-04-17 6:15 ` Greg Kroah-Hartman
2019-04-17 6:41 ` Nathan Chancellor
2019-04-17 6:47 ` Greg Kroah-Hartman
2019-04-16 9:13 ` Will Deacon
2019-04-16 16:49 ` Nathan Chancellor
2019-04-15 18:44 ` [PATCH 4.9 73/76] xen: Prevent buffer overflow in privcmd ioctl Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 74/76] sched/fair: Do not re-read ->h_load_next during hierarchical load calculation Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 75/76] xtensa: fix return_address Greg Kroah-Hartman
2019-04-15 18:44 ` [PATCH 4.9 76/76] PCI: Add function 1 DMA alias quirk for Marvell 9170 SATA controller Greg Kroah-Hartman
2019-04-16 0:44 ` [PATCH 4.9 00/76] 4.9.169-stable review kernelci.org bot
2019-04-16 4:06 ` Naresh Kamboju
2019-04-16 10:33 ` Jon Hunter
2019-04-16 13:12 ` Guenter Roeck
2019-04-16 16:29 ` Guenter Roeck
2019-04-16 18:46 ` Greg Kroah-Hartman
2019-04-16 20:19 ` Guenter Roeck
2019-04-16 20:27 ` Greg Kroah-Hartman
2019-04-16 21:39 ` shuah
2019-04-16 22:05 ` Bharath Vedartham
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