diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/dsp56k.c | 2 | ||||
| -rw-r--r-- | drivers/char/hw_random/Kconfig | 16 | ||||
| -rw-r--r-- | drivers/char/hw_random/Makefile | 1 | ||||
| -rw-r--r-- | drivers/char/hw_random/bcm2835-rng.c | 47 | ||||
| -rw-r--r-- | drivers/char/hw_random/exynos-rng.c | 4 | ||||
| -rw-r--r-- | drivers/char/hw_random/meson-rng.c | 131 | ||||
| -rw-r--r-- | drivers/char/hw_random/omap-rng.c | 16 | ||||
| -rw-r--r-- | drivers/char/hw_random/stm32-rng.c | 10 | ||||
| -rw-r--r-- | drivers/char/ipmi/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/char/ipmi/ipmi_msghandler.c | 12 | ||||
| -rw-r--r-- | drivers/char/ipmi/ipmi_si_intf.c | 73 | ||||
| -rw-r--r-- | drivers/char/ipmi/ipmi_ssif.c | 6 | ||||
| -rw-r--r-- | drivers/char/mem.c | 30 |
13 files changed, 248 insertions, 112 deletions
diff --git a/drivers/char/dsp56k.c b/drivers/char/dsp56k.c index 8bf70e8c3f79..50aa9ba91f25 100644 --- a/drivers/char/dsp56k.c +++ b/drivers/char/dsp56k.c @@ -325,7 +325,7 @@ static long dsp56k_ioctl(struct file *file, unsigned int cmd, if(get_user(bin, &binary->bin) < 0) return -EFAULT; - if (len == 0) { + if (len <= 0) { return -EINVAL; /* nothing to upload?!? */ } if (len > DSP56K_MAX_BINARY_LENGTH) { diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index ac51149e9777..56ad5a5936a9 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -90,7 +90,7 @@ config HW_RANDOM_BCM63XX config HW_RANDOM_BCM2835 tristate "Broadcom BCM2835 Random Number Generator support" - depends on ARCH_BCM2835 + depends on ARCH_BCM2835 || ARCH_BCM_NSP || ARCH_BCM_5301X default HW_RANDOM ---help--- This driver provides kernel-side support for the Random Number @@ -396,6 +396,20 @@ config HW_RANDOM_PIC32 If unsure, say Y. +config HW_RANDOM_MESON + tristate "Amlogic Meson Random Number Generator support" + depends on HW_RANDOM + depends on ARCH_MESON || COMPILE_TEST + default y + ---help--- + This driver provides kernel-side support for the Random Number + Generator hardware found on Amlogic Meson SoCs. + + To compile this driver as a module, choose M here. the + module will be called meson-rng. + + If unsure, say Y. + endif # HW_RANDOM config UML_RANDOM diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 63022b49f160..04bb0b03356f 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -34,3 +34,4 @@ obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o obj-$(CONFIG_HW_RANDOM_STM32) += stm32-rng.o obj-$(CONFIG_HW_RANDOM_PIC32) += pic32-rng.o +obj-$(CONFIG_HW_RANDOM_MESON) += meson-rng.o diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c index 7192ec25f667..af2149273fe0 100644 --- a/drivers/char/hw_random/bcm2835-rng.c +++ b/drivers/char/hw_random/bcm2835-rng.c @@ -19,6 +19,7 @@ #define RNG_CTRL 0x0 #define RNG_STATUS 0x4 #define RNG_DATA 0x8 +#define RNG_INT_MASK 0x10 /* enable rng */ #define RNG_RBGEN 0x1 @@ -26,10 +27,24 @@ /* the initial numbers generated are "less random" so will be discarded */ #define RNG_WARMUP_COUNT 0x40000 +#define RNG_INT_OFF 0x1 + +static void __init nsp_rng_init(void __iomem *base) +{ + u32 val; + + /* mask the interrupt */ + val = readl(base + RNG_INT_MASK); + val |= RNG_INT_OFF; + writel(val, base + RNG_INT_MASK); +} + static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) { void __iomem *rng_base = (void __iomem *)rng->priv; + u32 max_words = max / sizeof(u32); + u32 num_words, count; while ((__raw_readl(rng_base + RNG_STATUS) >> 24) == 0) { if (!wait) @@ -37,8 +52,14 @@ static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max, cpu_relax(); } - *(u32 *)buf = __raw_readl(rng_base + RNG_DATA); - return sizeof(u32); + num_words = readl(rng_base + RNG_STATUS) >> 24; + if (num_words > max_words) + num_words = max_words; + + for (count = 0; count < num_words; count++) + ((u32 *)buf)[count] = readl(rng_base + RNG_DATA); + + return num_words * sizeof(u32); } static struct hwrng bcm2835_rng_ops = { @@ -46,10 +67,19 @@ static struct hwrng bcm2835_rng_ops = { .read = bcm2835_rng_read, }; +static const struct of_device_id bcm2835_rng_of_match[] = { + { .compatible = "brcm,bcm2835-rng"}, + { .compatible = "brcm,bcm-nsp-rng", .data = nsp_rng_init}, + { .compatible = "brcm,bcm5301x-rng", .data = nsp_rng_init}, + {}, +}; + static int bcm2835_rng_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; + void (*rng_setup)(void __iomem *base); + const struct of_device_id *rng_id; void __iomem *rng_base; int err; @@ -61,6 +91,15 @@ static int bcm2835_rng_probe(struct platform_device *pdev) } bcm2835_rng_ops.priv = (unsigned long)rng_base; + rng_id = of_match_node(bcm2835_rng_of_match, np); + if (!rng_id) + return -EINVAL; + + /* Check for rng init function, execute it */ + rng_setup = rng_id->data; + if (rng_setup) + rng_setup(rng_base); + /* set warm-up count & enable */ __raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS); __raw_writel(RNG_RBGEN, rng_base + RNG_CTRL); @@ -90,10 +129,6 @@ static int bcm2835_rng_remove(struct platform_device *pdev) return 0; } -static const struct of_device_id bcm2835_rng_of_match[] = { - { .compatible = "brcm,bcm2835-rng", }, - {}, -}; MODULE_DEVICE_TABLE(of, bcm2835_rng_of_match); static struct platform_driver bcm2835_rng_driver = { diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c index ed44561ea647..23d358553b21 100644 --- a/drivers/char/hw_random/exynos-rng.c +++ b/drivers/char/hw_random/exynos-rng.c @@ -45,12 +45,12 @@ struct exynos_rng { static u32 exynos_rng_readl(struct exynos_rng *rng, u32 offset) { - return __raw_readl(rng->mem + offset); + return readl_relaxed(rng->mem + offset); } static void exynos_rng_writel(struct exynos_rng *rng, u32 val, u32 offset) { - __raw_writel(val, rng->mem + offset); + writel_relaxed(val, rng->mem + offset); } static int exynos_rng_configure(struct exynos_rng *exynos_rng) diff --git a/drivers/char/hw_random/meson-rng.c b/drivers/char/hw_random/meson-rng.c new file mode 100644 index 000000000000..0cfd81bcaeac --- /dev/null +++ b/drivers/char/hw_random/meson-rng.c @@ -0,0 +1,131 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright (c) 2016 BayLibre, SAS. + * Author: Neil Armstrong <narmstrong@baylibre.com> + * Copyright (C) 2014 Amlogic, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + * The full GNU General Public License is included in this distribution + * in the file called COPYING. + * + * BSD LICENSE + * + * Copyright (c) 2016 BayLibre, SAS. + * Author: Neil Armstrong <narmstrong@baylibre.com> + * Copyright (C) 2014 Amlogic, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#include <linux/err.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/platform_device.h> +#include <linux/hw_random.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/of.h> + +#define RNG_DATA 0x00 + +struct meson_rng_data { + void __iomem *base; + struct platform_device *pdev; + struct hwrng rng; +}; + +static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) +{ + struct meson_rng_data *data = + container_of(rng, struct meson_rng_data, rng); + + if (max < sizeof(u32)) + return 0; + + *(u32 *)buf = readl_relaxed(data->base + RNG_DATA); + + return sizeof(u32); +} + +static int meson_rng_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct meson_rng_data *data; + struct resource *res; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->pdev = pdev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->base = devm_ioremap_resource(dev, res); + if (IS_ERR(data->base)) + return PTR_ERR(data->base); + + data->rng.name = pdev->name; + data->rng.read = meson_rng_read; + + platform_set_drvdata(pdev, data); + + return devm_hwrng_register(dev, &data->rng); +} + +static const struct of_device_id meson_rng_of_match[] = { + { .compatible = "amlogic,meson-rng", }, + {}, +}; + +static struct platform_driver meson_rng_driver = { + .probe = meson_rng_probe, + .driver = { + .name = "meson-rng", + .of_match_table = meson_rng_of_match, + }, +}; + +module_platform_driver(meson_rng_driver); + +MODULE_ALIAS("platform:meson-rng"); +MODULE_DESCRIPTION("Meson H/W Random Number Generator driver"); +MODULE_AUTHOR("Lawrence Mok <lawrence.mok@amlogic.com>"); +MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); +MODULE_LICENSE("Dual BSD/GPL"); diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c index 8a1432e8bb80..01d4be2c354b 100644 --- a/drivers/char/hw_random/omap-rng.c +++ b/drivers/char/hw_random/omap-rng.c @@ -384,7 +384,12 @@ static int omap_rng_probe(struct platform_device *pdev) } pm_runtime_enable(&pdev->dev); - pm_runtime_get_sync(&pdev->dev); + ret = pm_runtime_get_sync(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, "Failed to runtime_get device: %d\n", ret); + pm_runtime_put_noidle(&pdev->dev); + goto err_ioremap; + } ret = (dev->of_node) ? of_get_omap_rng_device_details(priv, pdev) : get_omap_rng_device_details(priv); @@ -435,8 +440,15 @@ static int __maybe_unused omap_rng_suspend(struct device *dev) static int __maybe_unused omap_rng_resume(struct device *dev) { struct omap_rng_dev *priv = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret) { + dev_err(dev, "Failed to runtime_get device: %d\n", ret); + pm_runtime_put_noidle(dev); + return ret; + } - pm_runtime_get_sync(dev); priv->pdata->init(priv); return 0; diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c index 92a810648bd0..63d84e6f1891 100644 --- a/drivers/char/hw_random/stm32-rng.c +++ b/drivers/char/hw_random/stm32-rng.c @@ -69,8 +69,12 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) } /* If error detected or data not ready... */ - if (sr != RNG_SR_DRDY) + if (sr != RNG_SR_DRDY) { + if (WARN_ONCE(sr & (RNG_SR_SEIS | RNG_SR_CEIS), + "bad RNG status - %x\n", sr)) + writel_relaxed(0, priv->base + RNG_SR); break; + } *(u32 *)data = readl_relaxed(priv->base + RNG_DR); @@ -79,10 +83,6 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) max -= sizeof(u32); } - if (WARN_ONCE(sr & (RNG_SR_SEIS | RNG_SR_CEIS), - "bad RNG status - %x\n", sr)) - writel_relaxed(0, priv->base + RNG_SR); - pm_runtime_mark_last_busy((struct device *) priv->rng.priv); pm_runtime_put_sync_autosuspend((struct device *) priv->rng.priv); diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig index 6ed9e9fe5233..5a9350b1069a 100644 --- a/drivers/char/ipmi/Kconfig +++ b/drivers/char/ipmi/Kconfig @@ -50,18 +50,6 @@ config IPMI_SI Currently, only KCS and SMIC are supported. If you are using IPMI, you should probably say "y" here. -config IPMI_SI_PROBE_DEFAULTS - bool 'Probe for all possible IPMI system interfaces by default' - default n - depends on IPMI_SI - help - Modern systems will usually expose IPMI interfaces via a discoverable - firmware mechanism such as ACPI or DMI. Older systems do not, and so - the driver is forced to probe hardware manually. This may cause boot - delays. Say "n" here to disable this manual probing. IPMI will then - only be available on older systems if the "ipmi_si_intf.trydefaults=1" - boot argument is passed. - config IPMI_SSIF tristate 'IPMI SMBus handler (SSIF)' select I2C diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c index 94fb407d8561..d8619998cfb5 100644 --- a/drivers/char/ipmi/ipmi_msghandler.c +++ b/drivers/char/ipmi/ipmi_msghandler.c @@ -474,12 +474,12 @@ static DEFINE_MUTEX(smi_watchers_mutex); static const char * const addr_src_to_str[] = { "invalid", "hotmod", "hardcoded", "SPMI", "ACPI", "SMBIOS", "PCI", - "device-tree", "default" + "device-tree" }; const char *ipmi_addr_src_to_str(enum ipmi_addr_src src) { - if (src > SI_DEFAULT) + if (src >= SI_LAST) src = 0; /* Invalid */ return addr_src_to_str[src]; } @@ -3820,6 +3820,7 @@ static void handle_new_recv_msgs(ipmi_smi_t intf) while (!list_empty(&intf->waiting_rcv_msgs)) { smi_msg = list_entry(intf->waiting_rcv_msgs.next, struct ipmi_smi_msg, link); + list_del(&smi_msg->link); if (!run_to_completion) spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock, flags); @@ -3829,11 +3830,14 @@ static void handle_new_recv_msgs(ipmi_smi_t intf) if (rv > 0) { /* * To preserve message order, quit if we - * can't handle a message. + * can't handle a message. Add the message + * back at the head, this is safe because this + * tasklet is the only thing that pulls the + * messages. */ + list_add(&smi_msg->link, &intf->waiting_rcv_msgs); break; } else { - list_del(&smi_msg->link); if (rv == 0) /* Message handled */ ipmi_free_smi_msg(smi_msg); diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c index 7b1c412b40a2..a112c0146012 100644 --- a/drivers/char/ipmi/ipmi_si_intf.c +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -1322,7 +1322,6 @@ static bool si_tryplatform = true; #ifdef CONFIG_PCI static bool si_trypci = true; #endif -static bool si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS); static char *si_type[SI_MAX_PARMS]; #define MAX_SI_TYPE_STR 30 static char si_type_str[MAX_SI_TYPE_STR]; @@ -1371,10 +1370,6 @@ module_param_named(trypci, si_trypci, bool, 0); MODULE_PARM_DESC(trypci, "Setting this to zero will disable the" " default scan of the interfaces identified via pci"); #endif -module_param_named(trydefaults, si_trydefaults, bool, 0); -MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the" - " default scan of the KCS and SMIC interface at the standard" - " address"); module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0); MODULE_PARM_DESC(type, "Defines the type of each interface, each" " interface separated by commas. The types are 'kcs'," @@ -3461,62 +3456,6 @@ static inline void wait_for_timer_and_thread(struct smi_info *smi_info) del_timer_sync(&smi_info->si_timer); } -static const struct ipmi_default_vals -{ - const int type; - const int port; -} ipmi_defaults[] = -{ - { .type = SI_KCS, .port = 0xca2 }, - { .type = SI_SMIC, .port = 0xca9 }, - { .type = SI_BT, .port = 0xe4 }, - { .port = 0 } -}; - -static void default_find_bmc(void) -{ - struct smi_info *info; - int i; - - for (i = 0; ; i++) { - if (!ipmi_defaults[i].port) - break; -#ifdef CONFIG_PPC - if (check_legacy_ioport(ipmi_defaults[i].port)) - continue; -#endif - info = smi_info_alloc(); - if (!info) - return; - - info->addr_source = SI_DEFAULT; - - info->si_type = ipmi_defaults[i].type; - info->io_setup = port_setup; - info->io.addr_data = ipmi_defaults[i].port; - info->io.addr_type = IPMI_IO_ADDR_SPACE; - - info->io.addr = NULL; - info->io.regspacing = DEFAULT_REGSPACING; - info->io.regsize = DEFAULT_REGSPACING; - info->io.regshift = 0; - - if (add_smi(info) == 0) { - if ((try_smi_init(info)) == 0) { - /* Found one... */ - printk(KERN_INFO PFX "Found default %s" - " state machine at %s address 0x%lx\n", - si_to_str[info->si_type], - addr_space_to_str[info->io.addr_type], - info->io.addr_data); - } else - cleanup_one_si(info); - } else { - kfree(info); - } - } -} - static int is_new_interface(struct smi_info *info) { struct smi_info *e; @@ -3844,8 +3783,6 @@ static int init_ipmi_si(void) #ifdef CONFIG_PARISC register_parisc_driver(&ipmi_parisc_driver); parisc_registered = true; - /* poking PC IO addresses will crash machine, don't do it */ - si_trydefaults = 0; #endif /* We prefer devices with interrupts, but in the case of a machine @@ -3885,16 +3822,6 @@ static int init_ipmi_si(void) if (type) return 0; - if (si_trydefaults) { - mutex_lock(&smi_infos_lock); - if (list_empty(&smi_infos)) { - /* No BMC was found, try defaults. */ - mutex_unlock(&smi_infos_lock); - default_find_bmc(); - } else - mutex_unlock(&smi_infos_lock); - } - mutex_lock(&smi_infos_lock); if (unload_when_empty && list_empty(&smi_infos)) { mutex_unlock(&smi_infos_lock); diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c index 097c86898608..5673ffff00be 100644 --- a/drivers/char/ipmi/ipmi_ssif.c +++ b/drivers/char/ipmi/ipmi_ssif.c @@ -568,12 +568,16 @@ static void retry_timeout(unsigned long data) } -static void ssif_alert(struct i2c_client *client, unsigned int data) +static void ssif_alert(struct i2c_client *client, enum i2c_alert_protocol type, + unsigned int data) { struct ssif_info *ssif_info = i2c_get_clientdata(client); unsigned long oflags, *flags; bool do_get = false; + if (type != I2C_PROTOCOL_SMBUS_ALERT) + return; + ssif_inc_stat(ssif_info, alerts); flags = ipmi_ssif_lock_cond(ssif_info, &oflags); diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 71025c2f6bbb..a33163dbb913 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -22,6 +22,7 @@ #include <linux/device.h> #include <linux/highmem.h> #include <linux/backing-dev.h> +#include <linux/shmem_fs.h> #include <linux/splice.h> #include <linux/pfn.h> #include <linux/export.h> @@ -66,12 +67,8 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size) u64 cursor = from; while (cursor < to) { - if (!devmem_is_allowed(pfn)) { - printk(KERN_INFO - "Program %s tried to access /dev/mem between %Lx->%Lx.\n", - current->comm, from, to); + if (!devmem_is_allowed(pfn)) return 0; - } cursor += PAGE_SIZE; pfn++; } @@ -661,6 +658,28 @@ static int mmap_zero(struct file *file, struct vm_area_struct *vma) return 0; } +static unsigned long get_unmapped_area_zero(struct file *file, + unsigned long addr, unsigned long len, + unsigned long pgoff, unsigned long flags) +{ +#ifdef CONFIG_MMU + if (flags & MAP_SHARED) { + /* + * mmap_zero() will call shmem_zero_setup() to create a file, + * so use shmem's get_unmapped_area in case it can be huge; + * and pass NULL for file as in mmap.c's get_unmapped_area(), + * so as not to confuse shmem with our handle on "/dev/zero". + */ + return shmem_get_unmapped_area(NULL, addr, len, pgoff, flags); + } + + /* Otherwise flags & MAP_PRIVATE: with no shmem object beneath it */ + return current->mm->get_unmapped_area(file, addr, len, pgoff, flags); +#else + return -ENOSYS; +#endif +} + static ssize_t write_full(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { @@ -768,6 +787,7 @@ static const struct file_operations zero_fops = { .read_iter = read_iter_zero, .write_iter = write_iter_zero, .mmap = mmap_zero, + .get_unmapped_area = get_unmapped_area_zero, #ifndef CONFIG_MMU .mmap_capabilities = zero_mmap_capabilities, #endif |