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maccess,probe_kernel: Allow arch specific override probe_kernel_(read|write)

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Some archs such as blackfin, would like to have an arch specific
probe_kernel_read() and probe_kernel_write() implementation which can
fall back to the generic implementation if no special operations are
needed.

CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Jason Wessel
2010-01-07 11:58:36 -06:00
parent 2c1f1895ef
commit 6144a85a0e
2 changed files with 12 additions and 3 deletions
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11
mm/maccess.c
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@ -14,7 +14,11 @@
* Safely read from address @src to the buffer at @dst. If a kernel fault
* happens, handle that and return -EFAULT.
*/
long probe_kernel_read(void *dst, void *src, size_t size)
long __weak probe_kernel_read(void *dst, void *src, size_t size)
__attribute__((alias("__probe_kernel_read")));
long __probe_kernel_read(void *dst, void *src, size_t size)
{
long ret;
mm_segment_t old_fs = get_fs();
@ -39,7 +43,10 @@ EXPORT_SYMBOL_GPL(probe_kernel_read);
* Safely write to address @dst from the buffer at @src. If a kernel fault
* happens, handle that and return -EFAULT.
*/
long notrace __weak probe_kernel_write(void *dst, void *src, size_t size)
long __weak probe_kernel_write(void *dst, void *src, size_t size)
__attribute__((alias("__probe_kernel_write")));
long __probe_kernel_write(void *dst, void *src, size_t size)
{
long ret;
mm_segment_t old_fs = get_fs();