diff options
Diffstat (limited to 'arch/i386/lib/usercopy.c')
| -rw-r--r-- | arch/i386/lib/usercopy.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/i386/lib/usercopy.c b/arch/i386/lib/usercopy.c index d22cfc9d656c..9f38b12b4af1 100644 --- a/arch/i386/lib/usercopy.c +++ b/arch/i386/lib/usercopy.c @@ -10,6 +10,7 @@ #include <linux/blkdev.h> #include <linux/module.h> #include <linux/backing-dev.h> +#include <linux/interrupt.h> #include <asm/uaccess.h> #include <asm/mmx.h> @@ -715,10 +716,17 @@ do { \ unsigned long __copy_to_user_ll(void __user *to, const void *from, unsigned long n) { - BUG_ON((long) n < 0); #ifndef CONFIG_X86_WP_WORKS_OK if (unlikely(boot_cpu_data.wp_works_ok == 0) && ((unsigned long )to) < TASK_SIZE) { + /* + * When we are in an atomic section (see + * mm/filemap.c:file_read_actor), return the full + * length to take the slow path. + */ + if (in_atomic()) + return n; + /* * CPU does not honor the WP bit when writing * from supervisory mode, and due to preemption or SMP, @@ -776,7 +784,6 @@ EXPORT_SYMBOL(__copy_to_user_ll); unsigned long __copy_from_user_ll(void *to, const void __user *from, unsigned long n) { - BUG_ON((long)n < 0); if (movsl_is_ok(to, from, n)) __copy_user_zeroing(to, from, n); else @@ -788,7 +795,6 @@ EXPORT_SYMBOL(__copy_from_user_ll); unsigned long __copy_from_user_ll_nozero(void *to, const void __user *from, unsigned long n) { - BUG_ON((long)n < 0); if (movsl_is_ok(to, from, n)) __copy_user(to, from, n); else @@ -801,7 +807,6 @@ EXPORT_SYMBOL(__copy_from_user_ll_nozero); unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from, unsigned long n) { - BUG_ON((long)n < 0); #ifdef CONFIG_X86_INTEL_USERCOPY if ( n > 64 && cpu_has_xmm2) n = __copy_user_zeroing_intel_nocache(to, from, n); @@ -816,7 +821,6 @@ unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from, unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from, unsigned long n) { - BUG_ON((long)n < 0); #ifdef CONFIG_X86_INTEL_USERCOPY if ( n > 64 && cpu_has_xmm2) n = __copy_user_intel_nocache(to, from, n); @@ -844,7 +848,6 @@ unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *fr unsigned long copy_to_user(void __user *to, const void *from, unsigned long n) { - BUG_ON((long) n < 0); if (access_ok(VERIFY_WRITE, to, n)) n = __copy_to_user(to, from, n); return n; @@ -870,7 +873,6 @@ EXPORT_SYMBOL(copy_to_user); unsigned long copy_from_user(void *to, const void __user *from, unsigned long n) { - BUG_ON((long) n < 0); if (access_ok(VERIFY_READ, from, n)) n = __copy_from_user(to, from, n); else |