linux-kernel - [PATCH v3 1/2] MIPS: IP27: Remove incorrect `cpu_has

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Date:   Sun, 1 May 2022 23:14:16 +0100 (BST)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
cc:     Joshua Kinard <kumba@...too.org>,
        Stephen Zhang <starzhangzsd@...il.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH v3 1/2] MIPS: IP27: Remove incorrect `cpu_has_fpu' override

Remove unsupported forcing of `cpu_has_fpu' to 1, which makes the `nofpu' 
kernel parameter non-functional, and also causes a link error:

ld: arch/mips/kernel/traps.o: in function `trap_init':
./arch/mips/include/asm/msa.h:(.init.text+0x348): undefined reference to `handle_fpe'
ld: ./arch/mips/include/asm/msa.h:(.init.text+0x354): undefined reference to `handle_fpe'
ld: ./arch/mips/include/asm/msa.h:(.init.text+0x360): undefined reference to `handle_fpe'

where the CONFIG_MIPS_FP_SUPPORT configuration option has been disabled.

Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
Reported-by: Stephen Zhang <starzhangzsd@...il.com>
Fixes: 0ebb2f4159af ("MIPS: IP27: Update/restructure CPU overrides")
Cc: stable@...r.kernel.org # v4.2+
---
Changes from v2:

- Give credit to Stephen for reporting the issue.

Changes from v1:

- s/chosen/disabled/ in the change description.
---
 arch/mips/include/asm/mach-ip27/cpu-feature-overrides.h |    1 -
 1 file changed, 1 deletion(-)

linux-mips-ip27-cpu-has-fpu.diff
Index: linux-macro/arch/mips/include/asm/mach-ip27/cpu-feature-overrides.h
===================================================================
--- linux-macro.orig/arch/mips/include/asm/mach-ip27/cpu-feature-overrides.h
+++ linux-macro/arch/mips/include/asm/mach-ip27/cpu-feature-overrides.h
@@ -25,7 +25,6 @@
 #define cpu_has_4kex			1
 #define cpu_has_3k_cache		0
 #define cpu_has_4k_cache		1
-#define cpu_has_fpu			1
 #define cpu_has_nofpuex			0
 #define cpu_has_32fpr			1
 #define cpu_has_counter			1