[PATCH] common: spl: Warn about overflow of SRAM stack

[Vignesh Raghavendra]

If early stack usage is exactly same as SIZE_LIMIT_PROVIDE_STACK, then
its most likely to have overflowed beyond this limit and corrupted any
regions beyond stack. Warn about this to the user.

Signed-off-by: Vignesh Raghavendra <vigneshr at ti.com>
---

I found this useful when debugging slient corruption of code/data leading
to random failures post relocation.

 common/spl/spl.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/common/spl/spl.c b/common/spl/spl.c
index 72078a8ebc8e..9a9c8fad7673 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -950,6 +950,13 @@ __weak void spl_relocate_stack_check(void)
 	}
 	printf("SPL initial stack usage: %lu bytes\n",
 	       CONFIG_VAL(SIZE_LIMIT_PROVIDE_STACK) - i);
+
+	/*
+	 * If we used up all of the SIZE_LIMIT_PROVIDE_STACK, then here is high
+	 * possibility of stack overflow, warn the user accordingly
+	 */
+	if (!i)
+		printf("SPL possible initial stack overflow detected!!\n");
 #endif
 }
 
-- 
2.40.1