docs: fault-injection: fix defaults

ignore-gfp-wait and ignore-gfp-highmem defaults are actually true (Y) in
both failslab and fail_page_alloc, not false as the docs suggest. See
page_alloc.c:3762 and failslab.c:13

At the same time use 'Y' instead of '1' in the example scripts just for
consistency. (though 1 would work)

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/Documentation/fault-injection/fault-injection.rst b/Documentation/fault-injection/fault-injection.rst
index 4a25c5e..eb9c2d9 100644 (file)
--- a/Documentation/fault-injection/fault-injection.rst
+++ b/Documentation/fault-injection/fault-injection.rst
@@ -132,16 +132,16 @@ configuration of fault-injection capabilities.
 
        Format: { 'Y' | 'N' }
 
-       default is 'N', setting it to 'Y' won't inject failures into
-       highmem/user allocations.
+       default is 'Y', setting it to 'N' will also inject failures into
+       highmem/user allocations (__GFP_HIGHMEM allocations).
 
 - /sys/kernel/debug/failslab/ignore-gfp-wait:
 - /sys/kernel/debug/fail_page_alloc/ignore-gfp-wait:
 
        Format: { 'Y' | 'N' }
 
-       default is 'N', setting it to 'Y' will inject failures
-       only into non-sleep allocations (GFP_ATOMIC allocations).
+       default is 'Y', setting it to 'N' will also inject failures
+       into allocations that can sleep (__GFP_DIRECT_RECLAIM allocations).
 
 - /sys/kernel/debug/fail_page_alloc/min-order:
 
@@ -280,7 +280,7 @@ Application Examples
     printf %#x -1 > /sys/kernel/debug/$FAILTYPE/times
     echo 0 > /sys/kernel/debug/$FAILTYPE/space
     echo 2 > /sys/kernel/debug/$FAILTYPE/verbose
-    echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait
+    echo Y > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait
 
     faulty_system()
     {
@@ -334,8 +334,8 @@ Application Examples
     printf %#x -1 > /sys/kernel/debug/$FAILTYPE/times
     echo 0 > /sys/kernel/debug/$FAILTYPE/space
     echo 2 > /sys/kernel/debug/$FAILTYPE/verbose
-    echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait
-    echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-highmem
+    echo Y > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait
+    echo Y > /sys/kernel/debug/$FAILTYPE/ignore-gfp-highmem
     echo 10 > /sys/kernel/debug/$FAILTYPE/stacktrace-depth
 
     trap "echo 0 > /sys/kernel/debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT