| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 008/105] parisc: Extend disabled preemption in copy_user_page | Date | Fri, 4 Aug 2017 16:14:36 -0700 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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From: John David Anglin <dave.anglin@bell.net>
commit 56008c04ebc099940021b714da2d7779117cf6a7 upstream.
It's always bothered me that we only disable preemption in copy_user_page around the call to flush_dcache_page_asm. This patch extends this to after the copy.
Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/parisc/kernel/cache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/parisc/kernel/cache.c +++ b/arch/parisc/kernel/cache.c @@ -452,8 +452,8 @@ void copy_user_page(void *vto, void *vfr before it can be accessed through the kernel mapping. */ preempt_disable(); flush_dcache_page_asm(__pa(vfrom), vaddr); - preempt_enable(); copy_page_asm(vto, vfrom); + preempt_enable(); } EXPORT_SYMBOL(copy_user_page);
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