linux-kernel - [PATCH 5.16 013/227] parisc: Show error if wrong 32/64-bit compiler is being used

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Date:   Mon, 21 Feb 2022 09:47:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Helge Deller <deller@....de>
Subject: [PATCH 5.16 013/227] parisc: Show error if wrong 32/64-bit compiler is being used

From: Helge Deller <deller@....de>

commit b160628e9ebcdc85d0db9d7f423c26b3c7c179d0 upstream.

It happens quite often that people use the wrong compiler to build the
kernel:

make ARCH=parisc   -> builds the 32-bit kernel
make ARCH=parisc64 -> builds the 64-bit kernel

This patch adds a sanity check which errors out with an instruction how
use the correct ARCH= option.

Signed-off-by: Helge Deller <deller@....de>
Cc: stable@...r.kernel.org # v5.15+
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/parisc/include/asm/bitops.h |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/arch/parisc/include/asm/bitops.h
+++ b/arch/parisc/include/asm/bitops.h
@@ -12,6 +12,14 @@
 #include <asm/barrier.h>
 #include <linux/atomic.h>
 
+/* compiler build environment sanity checks: */
+#if !defined(CONFIG_64BIT) && defined(__LP64__)
+#error "Please use 'ARCH=parisc' to build the 32-bit kernel."
+#endif
+#if defined(CONFIG_64BIT) && !defined(__LP64__)
+#error "Please use 'ARCH=parisc64' to build the 64-bit kernel."
+#endif
+
 /* See http://marc.theaimsgroup.com/?t=108826637900003 for discussion
  * on use of volatile and __*_bit() (set/clear/change):
  *	*_bit() want use of volatile.