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Subject[PATCH 3/3] ARM 4Kstacks: Decrease poll and select stack usage, when using 4K stacks
Reduce the max allowed size for struct poll_wqueue to avoid
using too much stack space in do_select() and do_sys_poll(),
when the kernel is using 4K stacks.

Signed-off-by: Tim Bird <tim.bird@am.sony.com>
---
include/linux/poll.h | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/include/linux/poll.h b/include/linux/poll.h
index cf40010..b7153a3 100644
--- a/include/linux/poll.h
+++ b/include/linux/poll.h
@@ -16,7 +16,11 @@
extern struct ctl_table epoll_table[]; /* for sysctl */
/* ~832 bytes of stack space used max in sys_select/sys_poll before allocating
additional memory. */
+#ifndef CONFIG_4KSTACKS
#define MAX_STACK_ALLOC 832
+#else
+#define MAX_STACK_ALLOC 448
+#endif
#define FRONTEND_STACK_ALLOC 256
#define SELECT_STACK_ALLOC FRONTEND_STACK_ALLOC
#define POLL_STACK_ALLOC FRONTEND_STACK_ALLOC
--
1.6.6


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