[RFC,1/3] decompress/keepalive.h: prepare for watchdog keepalive during kernel decompression
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Message ID 20191017114906.30302-2-linux@rasmusvillemoes.dk
State New
Headers show
  • watchdog servicing during decompression
Related show

Commit Message

Rasmus Villemoes Oct. 17, 2019, 11:49 a.m. UTC
Some boards have a hardware watchdog that (a) cannot be disabled
and (b) has a timeout short enough that there's no chance for the
kernel to get through decompression, let alone reach the
initialization of the appropriate watchdog device driver.

In order to allow booting such boards, the decompression routine needs
to service the watchdog in its main loop. This adds a header making it
easy to wire up each decompressor - just include this header and add a
decompress_keepalive() in the main loop.

Outside of the pre-boot stage, this is always a no-op.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
 include/linux/decompress/keepalive.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 include/linux/decompress/keepalive.h

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diff --git a/include/linux/decompress/keepalive.h b/include/linux/decompress/keepalive.h
new file mode 100644
index 000000000000..39caa7693624
--- /dev/null
+++ b/include/linux/decompress/keepalive.h
@@ -0,0 +1,14 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifdef PREBOOT
+#ifndef decompress_keepalive
+#define decompress_keepalive() do { } while (0)