diff options
| author | Robert Richter <robert.richter@amd.com> | 2011-06-07 11:49:55 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-07-21 20:41:57 +0200 |
| commit | 1ac2e6ca44e13a087eb7438d284f887097ee7e84 (patch) | |
| tree | 7ee4f00a67850e1e247610cefeae0ee7aa7b239a /arch/x86/oprofile | |
| parent | 9985c20f9e4aee6857c08246b273a3695a52b929 (diff) | |
x86, perf: Make copy_from_user_nmi() a library function
copy_from_user_nmi() is used in oprofile and perf. Moving it to other
library functions like copy_from_user(). As this is x86 code for 32
and 64 bits, create a new file usercopy.c for unified code.
Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110607172413.GJ20052@erda.amd.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/oprofile')
| -rw-r--r-- | arch/x86/oprofile/backtrace.c | 39 |
1 files changed, 1 insertions, 38 deletions
diff --git a/arch/x86/oprofile/backtrace.c b/arch/x86/oprofile/backtrace.c index 32f78eb46744..bff89dfe3619 100644 --- a/arch/x86/oprofile/backtrace.c +++ b/arch/x86/oprofile/backtrace.c @@ -12,10 +12,9 @@ #include <linux/sched.h> #include <linux/mm.h> #include <linux/compat.h> -#include <linux/highmem.h> +#include <linux/uaccess.h> #include <asm/ptrace.h> -#include <asm/uaccess.h> #include <asm/stacktrace.h> static int backtrace_stack(void *data, char *name) @@ -38,42 +37,6 @@ static struct stacktrace_ops backtrace_ops = { .walk_stack = print_context_stack, }; -/* from arch/x86/kernel/cpu/perf_event.c: */ - -/* - * best effort, GUP based copy_from_user() that assumes IRQ or NMI context - */ -static unsigned long -copy_from_user_nmi(void *to, const void __user *from, unsigned long n) -{ - unsigned long offset, addr = (unsigned long)from; - unsigned long size, len = 0; - struct page *page; - void *map; - int ret; - - do { - ret = __get_user_pages_fast(addr, 1, 0, &page); - if (!ret) - break; - - offset = addr & (PAGE_SIZE - 1); - size = min(PAGE_SIZE - offset, n - len); - - map = kmap_atomic(page); - memcpy(to, map+offset, size); - kunmap_atomic(map); - put_page(page); - - len += size; - to += size; - addr += size; - - } while (len < n); - - return len; -} - #ifdef CONFIG_COMPAT static struct stack_frame_ia32 * dump_user_backtrace_32(struct stack_frame_ia32 *head) |