linux-kernel - Re: [PATCH V3 07/15] arch/kunmap_atomic: Consolidate duplicate code

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Message-ID: <20200518042932.GA59205@roeck-us.net>
Date:   Sun, 17 May 2020 21:29:32 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, dri-devel@...ts.freedesktop.org,
        Christian Koenig <christian.koenig@....com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH V3 07/15] arch/kunmap_atomic: Consolidate duplicate code

On Sun, May 17, 2020 at 08:49:39PM -0700, Ira Weiny wrote:
> On Sat, May 16, 2020 at 03:33:06PM -0700, Guenter Roeck wrote:
> > On Thu, May 07, 2020 at 07:59:55AM -0700, ira.weiny@...el.com wrote:
> > > From: Ira Weiny <ira.weiny@...el.com>
> > > 
> > > Every single architecture (including !CONFIG_HIGHMEM) calls...
> > > 
> > > 	pagefault_enable();
> > > 	preempt_enable();
> > > 
> > > ... before returning from __kunmap_atomic().  Lift this code into the
> > > kunmap_atomic() macro.
> > > 
> > > While we are at it rename __kunmap_atomic() to kunmap_atomic_high() to
> > > be consistent.
> > > 
> > > Reviewed-by: Christoph Hellwig <hch@....de>
> > > Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> > 
> > This patch results in:
> > 
> > Starting init: /bin/sh exists but couldn't execute it (error -14)
> > 
> > when trying to boot microblazeel:petalogix-ml605 in qemu.
> 
> Thanks for the report.  I'm not readily seeing the issue.
> 
> Do you have a kernel config?  Specifically is CONFIG_HIGHMEM set?
> 
See below. Yes, CONFIG_HIGHMEM is set.

The scripts used to build and boot the image are at:

https://github.com/groeck/linux-build-test/tree/master/rootfs/microblazeel

Hope this helps,

Guenter

---
CONFIG_SYSVIPC=y
CONFIG_POSIX_MQUEUE=y
CONFIG_AUDIT=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_SYSFS_DEPRECATED=y
CONFIG_SYSFS_DEPRECATED_V2=y
CONFIG_BLK_DEV_INITRD=y
# CONFIG_BASE_FULL is not set
CONFIG_KALLSYMS_ALL=y
CONFIG_EMBEDDED=y
CONFIG_SLAB=y
CONFIG_KERNEL_BASE_ADDR=0x50000000
CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR=1
CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR=1
CONFIG_XILINX_MICROBLAZE0_USE_BARREL=1
CONFIG_XILINX_MICROBLAZE0_USE_DIV=1
CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL=2
CONFIG_XILINX_MICROBLAZE0_USE_FPU=2
CONFIG_XILINX_MICROBLAZE0_HW_VER="10.0.a"
CONFIG_HZ_100=y
CONFIG_MMU=y
CONFIG_HIGHMEM=y
CONFIG_PCI_XILINX=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
# CONFIG_BLK_DEV_BSG is not set
CONFIG_PARTITION_ADVANCED=y
# CONFIG_EFI_PARTITION is not set
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_INET=y
# CONFIG_IPV6 is not set
CONFIG_BRIDGE=m
CONFIG_PCI=y
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_MTD=y
CONFIG_MTD_CFI=y
CONFIG_MTD_CFI_INTELEXT=y
CONFIG_MTD_CFI_AMDSTD=y
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=8192
CONFIG_NETDEVICES=y
CONFIG_XILINX_EMACLITE=y
CONFIG_XILINX_LL_TEMAC=y
# CONFIG_INPUT is not set
# CONFIG_SERIO is not set
# CONFIG_VT is not set
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_OF_PLATFORM=y
CONFIG_SERIAL_UARTLITE=y
CONFIG_SERIAL_UARTLITE_CONSOLE=y
# CONFIG_HW_RANDOM is not set
CONFIG_XILINX_HWICAP=y
CONFIG_I2C=y
CONFIG_I2C_XILINX=y
CONFIG_SPI=y
CONFIG_SPI_XILINX=y
CONFIG_GPIOLIB=y
CONFIG_GPIO_SYSFS=y
CONFIG_GPIO_XILINX=y
# CONFIG_HWMON is not set
CONFIG_WATCHDOG=y
CONFIG_XILINX_WATCHDOG=y
CONFIG_FB=y
CONFIG_FB_XILINX=y
# CONFIG_USB_SUPPORT is not set
CONFIG_UIO=y
CONFIG_UIO_PDRV_GENIRQ=y
CONFIG_UIO_DMEM_GENIRQ=y
CONFIG_EXT2_FS=y
# CONFIG_DNOTIFY is not set
CONFIG_CRAMFS=y
CONFIG_ROMFS_FS=y
CONFIG_NFS_FS=y
CONFIG_CIFS=y
CONFIG_CIFS_STATS2=y
CONFIG_ENCRYPTED_KEYS=y
CONFIG_DEBUG_INFO=y
CONFIG_KGDB=y
CONFIG_KGDB_TESTS=y
CONFIG_KGDB_KDB=y
CONFIG_DEBUG_SLAB=y
CONFIG_DETECT_HUNG_TASK=y
CONFIG_DEBUG_SPINLOCK=y