From: Helge Deller <deller@gmx.de>
Date: Sun, 13 Feb 2022 21:29:25 +0000 (+0100)
Subject: parisc: Show error if wrong 32/64-bit compiler is being used
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b160628e9ebcdc85d0db9d7f423c26b3c7c179d0;p=linux.git

parisc: Show error if wrong 32/64-bit compiler is being used

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@gmx.de>
Cc: stable@vger.kernel.org # v5.15+
---

diff --git a/arch/parisc/include/asm/bitops.h b/arch/parisc/include/asm/bitops.h
index 0ec9cfc5131fc..56ffd260c669b 100644
--- 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.