diff options
| author | Davidlohr Bueso <dave@stgolabs.net> | 2018-01-22 18:21:37 +0100 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2018-03-05 23:43:45 +0100 |
| commit | 69c907022a7d9325cdc5c9dd064571e445df9a47 (patch) | |
| tree | 459e3c517dfe66d0058a41106092dbfd957d3abe /arch/ia64/kernel/err_inject.c | |
| parent | ia64: doc: tweak whitespace for 'console=' parameter (diff) | |
| download | linux-69c907022a7d9325cdc5c9dd064571e445df9a47.tar.xz linux-69c907022a7d9325cdc5c9dd064571e445df9a47.zip | |
ia64/err-inject: Use get_user_pages_fast()
At the point of sysfs callback, the call to gup is
done without mmap_sem (or any lock for that matter).
This is racy. As such, use the get_user_pages_fast()
alternative and safely avoid taking the lock, if possible.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/err_inject.c')
| -rw-r--r-- | arch/ia64/kernel/err_inject.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/ia64/kernel/err_inject.c b/arch/ia64/kernel/err_inject.c index 85bba43e7d5d..658a8e06a69b 100644 --- a/arch/ia64/kernel/err_inject.c +++ b/arch/ia64/kernel/err_inject.c @@ -142,7 +142,7 @@ store_virtual_to_phys(struct device *dev, struct device_attribute *attr, u64 virt_addr=simple_strtoull(buf, NULL, 16); int ret; - ret = get_user_pages(virt_addr, 1, FOLL_WRITE, NULL, NULL); + ret = get_user_pages_fast(virt_addr, 1, FOLL_WRITE, NULL); if (ret<=0) { #ifdef ERR_INJ_DEBUG printk("Virtual address %lx is not existing.\n",virt_addr); |