Found this problem while enabling queued rwlock on SPARC.
The parameter CONFIG_CPU_BIG_ENDIAN is used to clear the
specific byte in qrwlock structure. Without this parameter,
we clear the wrong byte. Here is the code.
static inline u8 *__qrwlock_write_byte(struct qrwlock *lock)
{
return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN);
}
Define CPU_BIG_ENDIAN for SPARC to fix it.
Signed-off-by: Babu Moger <babu.moger@xxxxxxxxxx>
Reviewed-by: Håkon Bugge <haakon.bugge@xxxxxxxxxx>
Reviewed-by: Jane Chu <jane.chu@xxxxxxxxxx>
Reviewed-by: Shannon Nelson <shannon.nelson@xxxxxxxxxx>
Reviewed-by: Vijay Kumar <vijay.ac.kumar@xxxxxxxxxx>
---
arch/sparc/Kconfig | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index a2ad946..8787fc4 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -91,6 +91,10 @@ config ARCH_DEFCONFIG
config ARCH_PROC_KCORE_TEXT
def_bool y
+config CPU_BIG_ENDIAN
+ bool
+ default y if SPARC64
+
config ARCH_ATU
bool
default y if SPARC64
--
1.7.1
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