The patch titled
Subject: byteorder: sanity check toolchain vs kernel endianness
has been removed from the -mm tree. Its filename was
byteorder-sanity-check-toolchain-vs-kernel-endianess.patch
This patch was dropped because it had testing failures
------------------------------------------------------
From: Christoph Hellwig <hch@xxxxxx>
Subject: byteorder: sanity check toolchain vs kernel endianness
When removing some dead big endian checks in the RISC-V code Nick
suggested that we should have some generic sanity checks. I don't think
we should have thos inside the RISC-V code, but maybe it might make sense
to have these in the generic byteorder headers. Note that these are UAPI
headers and some compilers might not actually define __BYTE_ORDER__, so we
first check that it actually exists.
[akpm@xxxxxxxxxxxxxxxxxxxx: coding style fixes]
Link: http://lkml.kernel.org/r/20190412143538.11780-1-hch@xxxxxx
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Suggested-by: Nick Kossifidis <mick@xxxxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/uapi/linux/byteorder/big_endian.h | 4 ++++
include/uapi/linux/byteorder/little_endian.h | 4 ++++
2 files changed, 8 insertions(+)
--- a/include/uapi/linux/byteorder/big_endian.h~byteorder-sanity-check-toolchain-vs-kernel-endianess
+++ a/include/uapi/linux/byteorder/big_endian.h
@@ -2,6 +2,10 @@
#ifndef _UAPI_LINUX_BYTEORDER_BIG_ENDIAN_H
#define _UAPI_LINUX_BYTEORDER_BIG_ENDIAN_H
+#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__
+#error "Unsupported endianness, check your toolchain"
+#endif
+
#ifndef __BIG_ENDIAN
#define __BIG_ENDIAN 4321
#endif
--- a/include/uapi/linux/byteorder/little_endian.h~byteorder-sanity-check-toolchain-vs-kernel-endianess
+++ a/include/uapi/linux/byteorder/little_endian.h
@@ -2,6 +2,10 @@
#ifndef _UAPI_LINUX_BYTEORDER_LITTLE_ENDIAN_H
#define _UAPI_LINUX_BYTEORDER_LITTLE_ENDIAN_H
+#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
+#error "Unsupported endianness, check your toolchain"
+#endif
+
#ifndef __LITTLE_ENDIAN
#define __LITTLE_ENDIAN 1234
#endif
_
Patches currently in -mm which might be from hch@xxxxxx are
mm-remove-the-account_page_dirtied-export.patch
mm-fix-an-overly-long-line-in-read_cache_page.patch
mm-dont-cast-readpage-to-filler_t-for-do_read_cache_page.patch
jffs2-pass-the-correct-prototype-to-read_cache_page.patch
9p-pass-the-correct-prototype-to-read_cache_page.patch
